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{{Short description|Tropical cyclones that develop in the Northwest Pacific Ocean}}
{{about|Pacific [[tropical cyclones]]|other uses|Typhoon (disambiguation)}}
{{Hatnote group|
[[File:Pacific Typhoons.jpg|thumb|Three different typhoons spinning over the western Pacific Ocean on August 7, 2006]]
{{Distinguish|Typhon|Typhoo}}
{{About|the type of tropical cyclones||Typhoon (disambiguation)}}
}}


[[File:Mangkhut 2018-09-12 0505Z.jpg|thumb|Satellite image of [[Typhoon Mangkhut]]]]
A '''bulbisaur''' is a mature [[tropical cyclone]] that develops in the northwestern part of the [[Pacific Ocean]] between [[180th meridian|180°]] and [[100th meridian east|100°E]]. This region is referred to as the northwest Pacific basin.<ref>{{cite web|url=http://www.aoml.noaa.gov/hrd/tcfaq/F1.html|author=[[Chris Landsea]]|publisher=[[National Hurricane Center]]|accessdate=2011-03-30|date=2010-06-01|title=Subject: F1) What regions around the globe have tropical cyclones and who is responsible for forecasting there?}}</ref> For organizational purposes, the northern Pacific Ocean is divided into three regions: the eastern (North America to [[140th meridian west|140°W]]), central (140°W to 180°), and western (180° to 100°E). Identical phenomena in the eastern north Pacific are called [[hurricanes]], with tropical cyclones moving into the western Pacific re-designated as typhoons. The [[Regional Specialized Meteorological Center]] (RSMC) for tropical cyclone forecasts is in [[Japan]], with other tropical cyclone warning centers for the northwest Pacific in [[Honolulu]] (the [[Joint Typhoon Warning Center]]), the [[Philippines]], and [[Hong Kong]]. While the RSMC names each system, the main name list itself is coordinated amongst 18 countries, including the United States, who have territories threatened by typhoons each year. The Philippines uses their own naming list for systems which approach the country.
[[File:Maria, Bopha and Saomai 2006-08-07 0435Z.jpg|thumb|Three different tropical cyclones active over the Western Pacific Ocean on August 7, 2006 ([[Typhoon Maria (2006)|Maria]], [[2006 Pacific typhoon season#Severe Tropical Storm Bopha|Bopha]], and [[Typhoon Saomai|Saomai]]). The cyclones on the lower and upper right are typhoons.|alt=]]


A '''typhoon''' is a [[tropical cyclone]] that develops between [[180th meridian|180°]] and [[100th meridian east|100°E]] in the [[Northern Hemisphere]] and which produces sustained hurricane-force winds of at least {{convert|119|km/h|mph|abbr=on}}.<ref>{{cite web|title=Typhoon|url=http://glossary.ametsoc.org/wiki/Typhoon|work=Glossary of Meteorology|date=2012|access-date=2015-04-05|publisher=[[American Meteorological Society]]|archive-date=2015-04-12|archive-url=https://web.archive.org/web/20150412011727/http://glossary.ametsoc.org/wiki/Typhoon|url-status=live}}</ref> This region is referred to as the [[Tropical cyclone basins#Northwestern Pacific Ocean|Northwestern Pacific Basin]],<ref>{{cite journal|url=http://www.aoml.noaa.gov/hrd/tcfaq/F1.html|author=Chris Landsea|access-date=2011-03-30|date=2010-06-01|title=Subject: F1) What regions around the globe have tropical cyclones and who is responsible for forecasting there?|journal=Journal of Geophysical Research: Atmospheres|pages=D06108|author-link=Chris Landsea|archive-date=2012-07-31|archive-url=https://web.archive.org/web/20120731202710/http://www.aoml.noaa.gov/hrd/tcfaq/F1.html|url-status=live}}</ref> accounting for almost one third of the world's tropical cyclones. The term ''hurricane'' refers to a tropical cyclone (again with sustained winds of at least {{convert|119|km/h|mph|abbr=on}}) in the north central and northeast Pacific, and the north Atlantic.<ref>{{cite web|title=Hurricane|url=http://glossary.ametsoc.org/wiki/Hurricane|work=Glossary of Meteorology|date=2012|access-date=2015-04-05|publisher=[[American Meteorological Society]]|archive-date=2015-04-05|archive-url=https://web.archive.org/web/20150405092036/http://glossary.ametsoc.org/wiki/Hurricane|url-status=live}}</ref> In all of the preceding regions, weaker tropical cyclones are called ''tropical storms''. For organizational purposes, the northern [[Pacific Ocean]] is divided into three regions: the eastern (North America to [[140th meridian west|140°W]]), central (140°W to 180°), and western (180° to 100°E). The [[Regional Specialized Meteorological Center]] (RSMC) for tropical cyclone forecasts is in [[Japan]], with other tropical cyclone warning centres for the northwest Pacific in [[Hawaii]] (the [[Joint Typhoon Warning Center]]), the [[Philippines]], and [[Hong Kong]]. Although the RSMC names each system, the main name list itself is coordinated among 18 countries that have territories threatened by typhoons each year.<ref name="HCT">{{cite web | title = What is the difference between a hurricane, a cyclone, and a typhoon? | work = OCEAN FACTS | publisher = [[National Ocean Service]] | url = http://oceanservice.noaa.gov/facts/cyclone.html | access-date = 2016-12-24 | archive-date = 2016-12-25 | archive-url = https://web.archive.org/web/20161225071725/http://oceanservice.noaa.gov/facts/cyclone.html | url-status = live }}</ref>
Within the northwestern Pacific there are no official typhoon seasons as tropical cyclones form throughout the year. Like any tropical cyclone, there are six main requirements for typhoon formation and development: sufficiently warm [[sea surface temperature]]s, atmospheric instability, high [[relative humidity|humidity]] in the lower to middle levels of the troposphere, enough [[Coriolis effect|Coriolis force]] to develop a [[low-pressure area|low pressure center]], a pre-existing low level focus or disturbance, and low vertical [[wind shear]]. The majority of storms form between June and November whilst tropical cyclone formation is at a minimum between December and May. On average, the northwestern Pacific features the most numerous and intense tropical cyclones globally. Like other basins, they are steered by the [[subtropical ridge]] towards the west or northwest, with some systems recurving near and east of Japan. The Philippines receive a brunt of the landfalls, with [[China]] and Japan being impacted slightly less. Some of the deadliest typhoons in history have struck China. Southern China has the longest record of typhoon impacts for the region, with a thousand year sample via documents within their archives. [[Taiwan]] has received the wettest known typhoon on record for the [[Tropical cyclone basins|northwest Pacific tropical cyclone basin]].

Within most of the northwestern Pacific, there are no official typhoon seasons as tropical cyclones form throughout the year. Like any tropical cyclone, there are several main requirements for typhoon formation and development. It must be in sufficiently warm [[sea surface temperature]]s, atmospheric instability, high [[relative humidity|humidity]] in the lower-to-middle levels of the [[troposphere]], have enough [[Coriolis effect]] to develop a [[low-pressure area|low pressure centre]], a pre-existing low level focus or disturbance, and a low vertical [[wind shear]]. Although the majority of storms form between June and November, a few storms may occur between December and May (although tropical cyclone formation is very rare during that time). On average, the northwestern Pacific features the most numerous and intense tropical cyclones globally. Like other basins, they are steered by the [[subtropical ridge]] towards the west or northwest, with some systems recurving near and east of [[Japan]]. The Philippines receive the brunt of the landfalls, with [[China]] and Japan being less often impacted. However, some of the deadliest typhoons in history have struck China. Southern China has the longest record of typhoon impacts for the region, with a thousand-year sample via documents within their archives. [[Taiwan]] has received the wettest known typhoon on record for the northwest Pacific [[tropical cyclone basin]]s. However, Vietnam recognises its typhoon season as lasting from the beginning of June through to the end of November, with an average of four to six typhoons hitting the country annually.<ref>{{Cite web|date=2019-10-29|title=Typhoon and Tropical Cyclone Seasons in Vietnam|url=https://vn.usembassy.gov/typhoon-and-tropical-cyclone-seasons-in-vietnam/|access-date=2022-01-07|website=U.S. Embassy & Consulate in Vietnam|language=en-US|archive-date=2022-01-07|archive-url=https://web.archive.org/web/20220107033323/https://vn.usembassy.gov/typhoon-and-tropical-cyclone-seasons-in-vietnam/|url-status=live}}</ref><ref>{{Cite web|last=Briefing|first=Vietnam|date=2021-09-15|title=Typhoon Season in Vietnam: How to Prepare Your Business|url=https://www.vietnam-briefing.com/news/typhoon-season-vietnam-how-to-prepare-your-business.html/|access-date=2022-01-07|website=Vietnam Briefing News|language=en|archive-date=2021-12-16|archive-url=https://web.archive.org/web/20211216070109/https://www.vietnam-briefing.com/news/typhoon-season-vietnam-how-to-prepare-your-business.html/|url-status=live}}</ref>

According to the statistics of the Joint Typhoon Warning Center, from 1950 to 2022, the Northwest Pacific generated an average of 26.5 named tropical cyclones each year, of which an average of 16.6 reached typhoon standard or above as defined by the Joint Typhoon Warning Center.<ref>{{Cite web |title=Northwest Pacific Ocean Historical Tropical Cyclone Statistics |url=http://tropical.atmos.colostate.edu/Realtime/index.php?arch&loc=northwestpacific |website=Colorado State University}}</ref>
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<ref name="BOM">{{cite web|url=http://www.cawcr.gov.au/bmrc/pubs/tcguide/globa_guide_intro.htm|title=Global Guide to Tropical Cyclone Forecasting|accessdate=2009-10-19 | work = (Holland 1993). # Holland, G.J. (1993): "Ready Reckoner" - Chapter 9, Global Guide to Tropical Cyclone Forecasting, WMO/TC-No. 560, Report No. TCP-31, World Meteorological Organization; Geneva, Switzerland }}</ref>
<ref name="BOM">{{cite web|url=http://www.cawcr.gov.au/bmrc/pubs/tcguide/globa_guide_intro.htm|title=Global Guide to Tropical Cyclone Forecasting|access-date=2009-10-19 | work = (Holland 1993). # Holland, G.J. (1993): "Ready Reckoner" Chapter 9, Global Guide to Tropical Cyclone Forecasting, WMO/TC-No. 560, Report No. TCP-31, World Meteorological Organization; Geneva, Switzerland }}</ref>
<ref name ="AOML">{{cite web|url=http://www.aoml.noaa.gov/hrd/tcfaq/A1.html|title=Atlantic Oceanographic and Meteorological Laboratory|accessdate=2009-10-19 | work=FAQ: What is a hurricane, typhoon, or tropical cyclone?}}</ref>
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<ref name="TyphoonBasic">{{cite news|url=http://www.usatoday.com/weather/hurricane/typhoon-names.htm|title=How typhoons are named|accessdate=2008-08-18|work=USA Today|date=2007-11-01}}</ref>
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==Nomenclature==
== Nomenclature ==
===Etymology===
=== Etymology ===
The etymology of typhoon is either Chinese or [[Indo-Iranian languages|Persian-Hindustani]] origin.
The English term ''typhoon'' appears to be related to Chinese southern dialects such as [[Hakka]] and [[Cantonese]], where the pronunciation for 大風

(''Dai-fung'', Great Wind) sounds exactly like the English word. (The more modern term for Typhoon in [[Chinese language|Chinese]] ({{zh|t=颱風|zh|s=台风|p=Táifēng}}), having the literal meaning of "Wind from Taiwan", or in [[Japanese language|Japanese]] 台風 (tai-fū), may have been re-imported from English.) In plural, one can add an "s" at the end in [[English language|English]] although in Chinese, "Táifēng", as with "Taifu" in Japanese, is always pronounced the same for both singular and plural. Another possible origin for the etymology of typhoon could be from the [[greek language|Greek]] τύφειν (typhein), to smoke, which later made its way into the [[Arabic language|Arabic]] language (as طوفان Tufân) to describe the [[cyclone|cyclonic]] storms of the [[Indian Ocean]].<ref>{{cite book|url=http://books.google.com/?id=sMiRc-JFIfMC&pg=PA141&lpg=PA141&dq=typhoon+greek+arab+origin+book#v=onepage&q&f=false|pages=141–142|author=Anatoly Liberman|title=Word Origins And How We Know Them: Etymology for Everyone|year=2009|publisher=Oxford University Press|accessdate=2011-03-06|isbn=9780195387070}}</ref> ''Typhoon'' is the regional name in the northwest Pacific for a severe (or mature) tropical cyclone,<ref>{{cite web|title=Typhoon|url=http://amsglossary.allenpress.com/glossary/search?id=typhoon1|author=Glossary of Meteorology|date=June 2000|accessdate=2011-03-24|publisher=[[American Meteorological Society]]}}</ref> whereas ''hurricane'' is the regional term for the northeast Pacific, northern Atlantic. Elsewhere, storms of similar strength are termed ''tropical cyclone'', ''severe tropical cyclone'', or ''severe cyclonic storm''.<ref>{{cite web|url=http://www.aoml.noaa.gov/hrd/tcfaq/A1.html|date=2010-06-01|accessdate=2011-03-24|title=Frequently Asked Questions Subject: A1) What is a hurricane, typhoon, or tropical cyclone?|author=[[Chris Landsea]]|publisher=[[National Hurricane Center]]}}</ref>
Typhoon may trace to {{lang|zh|風癡}} (meaning "winds which long last"), first attested in 1124 in China. It was pronounced as {{IPA|nan-TW|hɔŋ tsʰi|}} in [[Min Chinese]] at the time, but later evolved to [hɔŋ tʰai]. New characters {{lang|zh|風颱}} were created to match the sound, no later than 1566.<ref name="Li 1990"/><ref name="attest date">{{cite book|date=280|title=三國志·吳書|trans-title=[[Records of the Three Kingdoms]] – Book of Wu|chapter=陸凱傳|editor-last=Chen|editor-first=Shou|quote=蒼梧、南海,歲有舊風瘴氣之害,風則折木,飛沙轉石}}; {{cite book|title=宣和奉使高麗圖經|trans-title=The trip of the Imperial envoy to Korea, with illustrations|last=徐兢|date=1124|quote=海道之難甚矣...又惡三種險:曰癡風,曰黑風,曰海動。癡風之作,連日怒號不止,四方莫辨}}; {{cite book|title=荔鏡記|trans-title=[[Tale of the Lychee Mirror]]|date=1566|quote=風台過了,今即會[''sic'', 回]南}}. As cited in {{cite journal|title=台风的本字(上)|last=李荣|date=1990|journal=方言|issue=4|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字(中)|last=李荣|date=1991|journal=方言|issue=1|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字(下)|last=李荣|date=1991|journal=方言|issue=2|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}</ref> The word was introduced to [[Mandarin Chinese]] in the inverted Mandarin order {{lang|zh|颱風}} {{IPA|cmn|tʰaɪ fɤŋ|}}, later picked up by foreign sailors to appear as typhoon.<ref name="Li 1990">{{cite journal|title=台风的本字(上)|last=李荣|date=1990|journal=方言|issue=4|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字(中)|last=李荣|date=1991|journal=方言|issue=1|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字(下)|last=李荣|date=1991|journal=方言|issue=2|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字 [Selected reprint]|last=李荣|editor=冯爱珍|date=2006|journal=科技术语研究(季刊)|issue=4|volume=8|url=http://www.term.org.cn/CN/PDF/10948?token=7ea825541ba2405ca4e592c820de03bf}}</ref> The usage of {{lang|zh|颱風}} was not dominant until [[Chu Coching]], the head of meteorology of the [[Academia Sinica|national academy]] from 1929 to 1936, declared it to be the standard term.<ref name="Fu 2023"/><ref name="Wu 2020"/> There were 29 alternative terms for typhoon recorded in a chronicle in 1762, now mostly replaced by {{lang|zh|颱風}},<ref>The ''[[Chaozhou]] Chronicle'' 潮州府志 (1762) recorded 29 expressions for typhoon, including {{lang|zh|回南風, 落西風, 蕩西風, 奔龍 and 鐵風篩.}} As cited in {{cite journal|title=台风的本字(上)|last=李荣|date=1990|journal=方言|issue=4|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字(中)|last=李荣|date=1991|journal=方言|issue=1|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}; {{cite journal|title=台风的本字(下)|last=李荣|date=1991|journal=方言|issue=2|url=https://www.ispeakmin.com/bbs/thread-4425-1.html}}</ref> although {{lang|zh|風癡}} or {{lang|zh|風颱}} continues to be used in [[Min Chinese]]- and [[Wu Chinese]]- speaking areas from [[Teochew dialect|Chaozhou]], Guangdong to [[Taizhou dialect|Taizhou]], Zhejiang.<ref name="Li 1990"/>

Some English linguists proposed the English word typhoon traced to the Cantonese pronunciation of {{lang|zh|颱風}} {{IPA|yue|tʰɔi fuŋ|}} (correspond to Mandarin {{IPA|cmn|tʰaɪ fɤŋ|}}), in turn the Cantonese word traced to Arabic.<ref>{{Cite book|author1=Garland Hampton Cannon|author2=Alan S. Kaye|url=https://books.google.com/books?id=MiNWi1g3fJ4C&dq=typhoon+special&pg=PA74|title=The Arabic Contributions to the English Language: An Historical Dictionary|date=1994|publisher=Otto Harrassowitz Verlag|isbn=978-3-447-03491-3|pages=74|language=en|quote=''Typhoon'' [...] is a special case, transmitted by Cantonese, from Arabic, but ultimately deriving from Greek.|access-date=2021-12-05|archive-date=2022-05-02|archive-url=https://web.archive.org/web/20220502112032/https://books.google.com/books?id=MiNWi1g3fJ4C&dq=typhoon+special&pg=PA74|url-status=live}}</ref> This claim contradicts the fact that the Cantonese term for typhoon was {{lang|zh|風舊}} {{IPA|yue|fuŋ kɐu|}} before the national promotion of {{lang|zh|颱風}}.<ref name="Li 1990"/> {{lang|zh|風舊}} (meaning "winds which long last") was first attested in 280, being the oldest Chinese term for typhoon.<ref name="attest date"/> Not one Chinese historical record links {{lang|zh|颱風}} to an Arabic or foreign origin.<ref name="Fu 2023"/><ref name="Wu 2020"/> On the other hand, Chinese records consistently assert foreigners refer typhoon as "black wind".<ref name="Fu 2023"/><ref name="Wu 2020"/> "Black wind" eventually enters the vocabulary of [[Jin Chinese]] as {{lang|zh|黑老風}} {{IPA|cjy|xəʔ lo fəŋ|}}.<ref name="Wubu 2020">{{cite book|title=陕西方言集成:榆林卷|editor-last=王建领|last=贺雪梅|chapter=吴堡县篇|publisher=商务印书馆|date=2020|pages=692–726}}</ref>

Alternatively, some dictionaries propose that typhoon derived from (طوفان) ''tūfān'', meaning storm in [[Persian language|Persian]] and [[Hindustani language|Hindustani]].<ref name="1966 oed">{{cite encyclopedia|encyclopedia=The Oxford Dictionary of English Etymology|editor-last=Onions|editor-first=C. T.|page=965|title=Typhoon|publisher=Oxford University Press|year=1966|quote=typhoon. cyclonic storm in the China seas. XVI [century]. Adoption of Chinese ''tai fung'', dialect variant of ''ta'' big, ''feng'' wind; confer German ''taifun'', ''teifun'', French ''typhon''. Earlier † ''tuffoon'' (XVII), identified in form with † ''touffon'' (XVI), † ''tuffon'' (XVII) violent storm in India, adoption of Portuguese ''tufão'', adoption of Hindustani (in turn, adoption of Arabic) ''ṭūfān'' hurricane, tornado, beside which there was a contemporary † typhon (XVI), adoption of Latin ''tȳphōn'', adoption of Greek ''tuphôn'', related to ''tūphein'' (see TYPHUS).}}</ref><ref name="online">{{cite web|url=http://www.etymonline.com/index.php?term=typhoon|work=Online Etymology Dictionary|title=typhoon {{!}} Origin and meaning of typhoon by Online Etymology Dictionary|access-date=2008-10-26|archive-date=2014-01-25|archive-url=https://web.archive.org/web/20140125091024/http://www.etymonline.com/index.php?term=typhoon|url-status=live}}</ref> The [[Root (linguistics)|root]] of (طوفان) ''tūfān'' possibly traces to the Ancient Greek mythological creature ''[[Typhon|Typhôn]]''.<ref name="online"/> In [[French language|French]] ''typhon'' was attested as storm in 1504.<ref>{{Cite web|url=https://www.cnrtl.fr/definition/typhon|title=TYPHON : Définition de TYPHON|language=fr|access-date=2019-08-19|archive-date=2020-08-09|archive-url=https://web.archive.org/web/20200809125523/https://www.cnrtl.fr/definition/typhon|url-status=live}}</ref> Portuguese traveler [[Fernão Mendes Pinto]] referred to a ''tufão'' in his memoir published in 1614.<ref>{{cite book|title=Peregrinação: volume I|last=Pinto|first= Fernão Mendes|location=Rio de Janeiro|publisher=Fundação Darcy Ribeiro|date=2013|orig-date=1614|url=https://fundar.org.br/wp-content/uploads/2021/06/peregrinacao-vol-1.pdf|pages=181, 295}}</ref> The earliest form in English was "touffon" (1588),<ref name="online"/> later as touffon, tuffon, tufon, tuffin, tuffoon, tayfun, tiffoon, typhawn.<ref name="Fu 2023">{{cite journal |author=Fu |display-authors=et al |date=2023 |title=Historic and Future Perspectives of Storm and Cyclone |url=https://link.springer.com/content/pdf/10.1007/s00376-022-2184-1.pdf?error=cookies_not_supported&code=9b4e99db-050b-43d1-a238-bce77d44ed41 |journal=Advances in Atmospheric Sciences |volume=40 |issue=3 |pages=450–451 |bibcode=2023AdAtS..40..447F |doi=10.1007/s00376-022-2184-1 |issn=0256-1530 |s2cid=253918708}}</ref><ref name="Wu 2020">{{cite journal |last=Wu |first=Liguang |date=2020 |title=台风一词的历史沿革 |trans-title=Historical evolution of the word 'Typhoon' |url=http://html.rhhz.net/qxxb_cn/html/2020072.htm |journal=气象学报 (Acta Meteorologica Sinica) |volume=78 |issue=6 |pages=1065–1075 |doi=10.11676/qxxb2020.072 |issn=0577-6619}}</ref>


=== Intensity classifications ===
=== Intensity classifications ===
{{See also|Tropical cyclone scales}}
{{Japan Meteorological Agency's Tropical Cyclone Intensity Scale}}
{{Japan Meteorological Agency's Tropical Cyclone Intensity Scale}}
{{seealso|Tropical cyclone scales}}
A ''tropical depression'' is the lowest category that the [[Japan Meteorological Agency]] uses and is the term used for a tropical system that has wind speeds not exceeding {{convert|33|kn|mph km/h}}.<ref name="TCOM">{{cite web|url=http://www.wmo.ch/pages/prog/www/tcp/documents/TCP-23EDITION2008.pdf|format=PDF|year=2008|publisher=[[World Meteorological Organization]]|title=Typhoon Committee Operational Manual|author=Typhoon Committee|accessdate=2008-12-23}}</ref> A tropical depression is upgraded to a ''tropical storm'' should its [[maximum sustained wind|sustained wind speeds]] exceed {{convert|34|kn|mph km/h}}. Tropical storms also receive official names from RSMC Tokyo.<ref name="TCOM"/> Should the storm intensify further and reach sustained wind speeds of {{convert|48|kn|mph km/h}} then it will be classified as a ''severe tropical storm''.<ref name="TCOM"/> Once the system's maximum sustained winds reach wind speeds of {{convert|64|kn|mph km/h}}, the JMA will designate the tropical cyclone as a ''typhoon''—the highest category on its scale.<ref name="TCOM"/>


A ''tropical depression'' is the lowest category that the [[Japan Meteorological Agency]] uses and is the term used for a tropical system that has wind speeds not exceeding {{convert|33|kn|mph km/h}}.<ref name="TCOM">{{cite web |author=Typhoon Committee |year=2008 |title=Typhoon Committee Operational Manual |url=http://www.wmo.ch/pages/prog/www/tcp/documents/TCP-23EDITION2008.pdf |url-status=dead |archive-url=https://web.archive.org/web/20120717055253/http://www.wmo.int/pages/prog/www/tcp/documents/TCP-23EDITION2008.pdf |archive-date=2012-07-17 |access-date=2008-12-23 |publisher=[[World Meteorological Organization]] |type=report}}</ref> A tropical depression is upgraded to a ''tropical storm'' should its [[maximum sustained wind|sustained wind speeds]] exceed {{convert|34|kn|mph km/h}}. Tropical storms also receive official names from RSMC Tokyo.<ref name="TCOM" /> Should the storm intensify further and reach sustained wind speeds of {{convert|48|kn|mph km/h}} then it will be classified as a ''severe tropical storm''.<ref name="TCOM" /> Once the system's maximum sustained winds reach wind speeds of {{convert|64|kn|mph km/h}}, the JMA will designate the tropical cyclone as a ''typhoon''—the highest category on its scale.<ref name="TCOM" />
From 2009 the [[Hong Kong Observatory]] started to further divide typhoon into two further classifications ''severe typhoon'' and ''super typhoon''.<ref name="HKO"/> A severe typhoon has winds of at least {{convert|80|kn|mph km/h}} whilst a super typhoon has winds of at least {{convert|100|kn|mph km/h}}.<ref name="HKO">{{cite web|url=http://www.weather.gov.hk/wxinfo/news/2009/20090318_appendix1e.pdf|title=Classifications of Tropical cyclones|date=2009-03-18|publisher=[[Hong Kong Observatory]]|accessdate=2009-04-27}}</ref> The [[United States]]' [[Joint Typhoon Warning Center]] (JTWC) unofficially classifies typhoons with wind speeds of at least 130&nbsp;knots (67&nbsp;m/s; 150&nbsp;mph; 241&nbsp;km/h)—the equivalent of a strong Category&nbsp;4 storm in the [[Saffir-Simpson Hurricane Scale|Saffir-Simpson scale]]—as ''super typhoons''.<ref>{{cite web|url=http://www.usno.navy.mil/JTWC/frequently-asked-questions-1#labels|author=[[Joint Typhoon Warning Center]] | title = What are the description labels used with tropical cyclones by JTWC?|publisher=[[Joint Typhoon Warning Center]]|Frequently Asked Questions (FAQ)|date=2008-03-31|accessdate=2008-12-22}}</ref> However, the maximum sustained wind speed measurements that the JTWC uses are based on a 1-minute averaging period, akin to the U.S.' [[National Hurricane Center]] and [[Central Pacific Hurricane Center]]. As a result, the JTWC's wind reports are higher than JMA's measurements, as the latter are based on a 10-minute averaging interval.<ref name="JTWC FAQ fcstdiff">{{cite web|url=http://www.usno.navy.mil/JTWC/frequently-asked-questions-1#fcstdiff|title=How are JTWC forecasts different than forecasts issued by tropical cyclone warning centres (TCWCs) of other countries?|date=2008-03-31|publisher=[[Joint Typhoon Warning Center]]|accessdate=2008-12-26}}</ref>


Since 2009 the [[Hong Kong Observatory]] has divided typhoons into three different classifications: ''typhoon'', ''severe typhoon'' and ''super typhoon''.<ref name="HKO" /> A ''typhoon'' has wind speed of 64–79 knots (73–91&nbsp;mph; 118–149&nbsp;km/h), a severe typhoon has winds of at least {{convert|80|kn|mph km/h}}, and a super typhoon has winds of at least {{convert|100|kn|mph km/h}}.<ref name="HKO">{{cite web|url=http://www.weather.gov.hk/wxinfo/news/2009/20090318_appendix1e.pdf|title=Classifications of Tropical cyclones|date=2009-03-18|publisher=[[Hong Kong Observatory]]|access-date=2009-04-27|archive-url=https://web.archive.org/web/20120330002011/http://www.weather.gov.hk/wxinfo/news/2009/20090318_appendix1e.pdf|archive-date=2012-03-30|url-status=dead}}</ref> The [[United States]]' [[Joint Typhoon Warning Center]] (JTWC) unofficially classifies typhoons with wind speeds of at least 130&nbsp;knots (67&nbsp;m/s; 150&nbsp;mph; 241&nbsp;km/h)—the equivalent of a strong Category&nbsp;4 storm in the [[Saffir-Simpson Hurricane Scale|Saffir-Simpson scale]]—as ''super typhoons''.<ref>{{cite web|url=http://www.usno.navy.mil/JTWC/frequently-asked-questions-1#labels|author=Joint Typhoon Warning Center|title=What are the description labels used with tropical cyclones by JTWC?|publisher=[[Joint Typhoon Warning Center]] – Frequently Asked Questions (FAQ)|date=2008-03-31|access-date=2008-12-22|author-link=Joint Typhoon Warning Center|archive-date=2012-07-15|archive-url=https://web.archive.org/web/20120715214854/http://www.usno.navy.mil/JTWC/frequently-asked-questions-1#labels|url-status=live}}</ref> However, the maximum sustained wind speed measurements that the JTWC uses are based on a 1-minute averaging period, akin to the U.S.'s [[National Hurricane Center]] and [[Central Pacific Hurricane Center]]. As a result, the JTWC's wind reports are higher than JMA's measurements, as the latter is based on a 10-minute averaging interval.<ref name="JTWC FAQ fcstdiff">{{cite web|url=http://www.usno.navy.mil/JTWC/frequently-asked-questions-1#fcstdiff|title=How are JTWC forecasts different than forecasts issued by tropical cyclone warning centres (TCWCs) of other countries?|date=2008-03-31|publisher=[[Joint Typhoon Warning Center]]|access-date=2008-12-26|archive-date=2012-07-15|archive-url=https://web.archive.org/web/20120715214854/http://www.usno.navy.mil/JTWC/frequently-asked-questions-1#fcstdiff|url-status=live}}</ref>
==Genesis==
[[Image:Depth26Cisotherm.gif|thumb|right|250px|Depth of 26&nbsp;°C [[Contour line|isotherm]] on October 1, 2006]]
{{See also|Tropical cyclogenesis}}
There are six main requirements for tropical cyclogenesis: sufficiently warm sea surface temperatures, atmospheric instability, high [[humidity]] in the lower to middle levels of the [[troposphere]], enough Coriolis force to develop a low pressure center, a pre-existing low level focus or disturbance, and low vertical wind shear. While these conditions are necessary for tropical cyclone formation, [[necessary but not sufficient|they do not guarantee]] that a tropical cyclone will form. Normally, an ocean temperature of 26.5&nbsp;°C (79.7&nbsp;°F]) spanning through a depth of at least {{convert|50|m|ft}} is considered the minimum to maintain the special [[mesocyclone]] that is the tropical cyclone. These warm waters are needed to maintain the [[warm core]] that fuels tropical systems. A minimum distance of 500&nbsp;km (300&nbsp;mi) from the [[equator]] is normally needed for tropical cyclogenesis.<ref name="A15"/>


== Genesis ==
Whether it be a depression in the [[intertropical convergence zone|intertropical covergence zone (ITCZ)]] or [[monsoon trough]], a broad [[surface weather analysis|surface front]], or an [[outflow boundary]], a low level feature with sufficient [[vorticity]] and convergence is required to begin tropical cyclogenesis. About 85 to 90&nbsp;percent of Pacific typhoons form within the monsoon trough.<ref name="KingTUTT">{{cite book|url=http://books.google.com/?id=uZvIuDv6A4gC&pg=PA515&dq=typhoon+origins+northwest+Pacific#v=onepage&q&f=false|pages=520–521|title=Synoptic and dynamic climatology|author=Roger Graham Barry and Andrew Mark Carleton|year=2001|publisher=Psychology Press|isbn=9780415031158|accessdate=2011-03-06}}</ref> Even with perfect upper level conditions and the required atmospheric instability, the lack of a surface focus will prevent the development of organized convection and a surface low. Vertical wind shear of less than 10&nbsp;m/s (20&nbsp;kn, 33&nbsp;ft/s) between the ocean surface and the [[tropopause]] is required for tropical cyclone development.<ref name="A15">[[Chris Landsea]] ({{date|2010-06-01}}). [http://www.aoml.noaa.gov/hrd/tcfaq/A15.html Subject: A15) How do tropical cyclones form ?] [[National Hurricane Center]]. Retrieved on 2011-03-24.</ref> Typically with Pacific typhoons, there are two [[outflow (meteorology)|outflow]] [[jet stream|jets]]: one to the north ahead of an upper trough in the [[Westerlies]], and a second towards the equator.<ref name="KingTUTT"/>
[[File:Depth26Cisotherm.png|thumb|Depth of 26&nbsp;°C [[Contour line|isotherm]] on October 1, 2006]]
{{See also|Tropical cyclogenesis}}
There are six main requirements for tropical cyclogenesis: sufficiently warm sea surface temperatures, atmospheric instability, high [[humidity]] in the lower to middle levels of the [[troposphere]], enough [[Coriolis force]] to develop a low pressure center, a pre-existing low level focus or disturbance, and low vertical wind shear. While these conditions are necessary for tropical cyclone formation, [[necessary but not sufficient|they do not guarantee]] that a tropical cyclone will form. Normally, an ocean temperature of 26.5&nbsp;°C (79.7&nbsp;°F) spanning through a depth of at least {{convert|50|m|ft}} is considered the minimum to maintain the special [[mesocyclone]] that is the tropical cyclone. These warm waters are needed to maintain the [[warm core]] that fuels tropical systems. A minimum distance of 500&nbsp;km (300&nbsp;mi) from the [[equator]] is normally needed for tropical cyclogenesis.<ref name="A15" />
Whether it be a depression in the [[Intertropical Convergence Zone]] (ITCZ) or [[monsoon trough]], a broad [[surface weather analysis|surface front]], or an [[outflow boundary]], a low level feature with sufficient [[vorticity]] and convergence is required to begin tropical cyclogenesis. About 85 to 90&nbsp;percent of Pacific typhoons form within the [[monsoon trough]].<ref name="KingTUTT">{{cite book|url=https://books.google.com/books?id=uZvIuDv6A4gC&q=typhoon+origins+northwest+Pacific&pg=PA515|pages=520–521|title=Synoptic and dynamic climatology|author1=Roger Graham Barry|author2=Andrew Mark Carleto|year=2001|publisher=Psychology Press|isbn=978-0-415-03115-8|access-date=2011-03-06|archive-date=2022-05-02|archive-url=https://web.archive.org/web/20220502112032/https://books.google.com/books?id=uZvIuDv6A4gC&q=typhoon+origins+northwest+Pacific&pg=PA515|url-status=live}}</ref> Even with perfect upper-level conditions and the required atmospheric instability, the lack of a surface focus will prevent the development of organized convection and a surface low. Vertical wind shear of less than 10&nbsp;m/s (20&nbsp;kn, 33&nbsp;ft/s) between the ocean surface and the [[tropopause]] is required for tropical cyclone development.<ref name="A15">{{cite web |author1=[[Chris Landsea]] |author1-link= |title=Subject: A15) How do tropical cyclones form ? |url=http://www.aoml.noaa.gov/hrd/tcfaq/A15.html |website= NOAA's Atlantic Oceanographic and Meteorological Laboratory |publisher=[[National Hurricane Center]] |access-date=2011-03-24 |archive-url=https://web.archive.org/web/20090827030639/http://www.aoml.noaa.gov/hrd/tcfaq/A15.html |archive-date=2009-08-27 |location= |pages= |doi= |date=1 June 2010}}</ref><ref>{{cite web |title=Hurricane FAQ |url=http://www.aoml.noaa.gov/hrd/tcfaq/A15.html |website=NOAA's Atlantic Oceanographic and Meteorological Laboratory |access-date=}}</ref> Typically with Pacific typhoons, there are two [[jet stream|jets]] of [[outflow (meteorology)|outflow]]: one to the north ahead of an upper trough in the [[westerlies]], and a second towards the equator.<ref name="KingTUTT" />


In general, westerly wind increases associated with the [[Madden-Julian oscillation|Madden-Julian Oscillation]] lead to increased tropical cyclogenesis in all [[tropical cyclone basins]]. As the oscillation propagates from west to east, it leads to an eastward march in tropical cyclogenesis with time during that hemisphere's [[summer]] season.<ref name="AMS2">{{Cite journal| author = John Molinari and David Vollaro | url = http://ams.allenpress.com/perlserv/?request=get-document&doi=10.1175%2F1520-0493(2000)128%3C3296:PASSIO%3E2.0.CO%3B2 | title = Planetary- and Synoptic-Scale Influences on Eastern Pacific Tropical Cyclogenesis | journal = [[Monthly Weather Review]] | volume = 128 | issue = 9 | month = September | year = 2000 | accessdate = 2006-10-20 | pages = 3296–307 | doi = 10.1175/1520-0493(2000)128<3296:PASSIO>2.0.CO;2|bibcode = 2000MWRv..128.3296M }}</ref> On average, twice per year twin tropical cyclones will form in the western Pacific ocean, near the [[5th parallel north]] and the [[5th parallel south]], along the same meridian, or line of longitude.<ref>{{cite book|url=http://books.google.com/?id=RUbq73qXIIkC&pg=PA269&dq=typhoon+origins+northwest+Pacific#v=onepage&q&f=false|page=271|title=Atmosphere, weather, and climate|author=Roger Graham Barry and Richard J. Chorley|year=2003|publisher=Psychology Press|isbn=9780415271707|accessdate=2011-03-06}}</ref> There is an inverse relationship between tropical cyclone activity in the western Pacific basin and the north Atlantic basin, however. When one basin is active, the other is normally quiet, and vice versa. The main reason for this appears to be the phase of the [[Madden-Julian oscillation]], or MJO, which is normally in opposite modes between the two basins at any given time.<ref name="Mad-Jul">{{Cite journal| doi = 10.1175/1520-0469(2001)058<2545:TMJOBD>2.0.CO;2| title = The Madden–Julian Oscillation, Barotropic Dynamics, and North Pacific Tropical Cyclone Formation. Part I: Observations | author = E. D. Maloney and D. L. Hartmann | url = http://journals.ametsoc.org/doi/pdf/10.1175/1520-0469%282001%29058%3C2545%3ATMJOBD%3E2.0.CO%3B2 | format = PDF | journal = [[Journal of the Atmospheric Sciences]] | year = 2001 | month = September | volume = 58 | issue = 17 | pages = 2545–2558 | accessdate = 2008-06-24|bibcode = 2001JAtS...58.2545M }}</ref>
In general, the westerly wind increases associated with the [[Madden–Julian oscillation]] lead to increased tropical cyclogenesis in all [[tropical cyclone basins]]. As the oscillation propagates from west to east, it leads to an eastward march in tropical cyclogenesis with time during that hemisphere's summer season.<ref name="AMS2">{{Cite journal |author1=John Molinari |author2=David Vollaro |date=September 2000 |title=Planetary- and Synoptic-Scale Influences on Eastern Pacific Tropical Cyclogenesis |journal=[[Monthly Weather Review]] |volume=128 |issue=9 |pages=3296–307 |bibcode=2000MWRv..128.3296M |doi=10.1175/1520-0493(2000)128<3296:PASSIO>2.0.CO;2 |issn=0027-0644 |s2cid=9278279|doi-access=free }}</ref> On average, twice per year twin tropical cyclones will form in the western Pacific Ocean, near the [[5th parallel north]] and the [[5th parallel south]], along the same meridian, or line of longitude.<ref>{{cite book|url=https://books.google.com/books?id=RUbq73qXIIkC&q=typhoon+origins+northwest+Pacific&pg=PA269|page=271|title=Atmosphere, weather, and climate|author1=Roger Graham Barry|author2=Richard J. Chorley|year=2003|publisher=Psychology Press|isbn=978-0-415-27170-7|access-date=2011-03-06|archive-date=2022-05-02|archive-url=https://web.archive.org/web/20220502112033/https://books.google.com/books?id=RUbq73qXIIkC&q=typhoon+origins+northwest+Pacific&pg=PA269|url-status=live}}</ref> There is an inverse relationship between tropical cyclone activity in the western Pacific basin and the North Atlantic basin, however. When one basin is active, the other is normally quiet, and vice versa. The main reason for this appears to be the phase of the Madden–Julian oscillation, or MJO, which is normally in opposite modes between the two basins at any given time.<ref name="Mad-Jul">{{Cite journal |author1=E. D. Maloney |author2=D. L. Hartmann |date=September 2001 |title=The Madden–Julian Oscillation, Barotropic Dynamics, and North Pacific Tropical Cyclone Formation. Part I: Observations |journal=[[Journal of the Atmospheric Sciences]] |volume=58 |issue=17 |pages=2545–2558 |bibcode=2001JAtS...58.2545M |citeseerx=10.1.1.583.3789 |doi=10.1175/1520-0469(2001)058<2545:TMJOBD>2.0.CO;2 |issn=0022-4928 |s2cid=35852730}}</ref>


==Frequency==
== Frequency ==
{| class="wikitable" style="width:300px; text-align:center; margin:0 1em; float:right;" HL +
{| class="wikitable" style="width:300px; text-align:center; margin:0 1em; float:right"
|+Storm Frequency<br/>Tropical storms and Typhoons by month,<br/>for the period 1959–2005
|+Storm Frequency<br />Tropical storms and Typhoons by month,<br />for the period 1959–2015
(Northwest Pacific)
(Northwest Pacific)
|-
|-
Line 43: Line 56:
! Average
! Average
|-
|-
| Jan || 28 || 0.6
| Jan || 28 || 0.5
|-
|-
| Feb || 15 || 0.3
| Feb || 14 || 0.2
|-
|-
| Mar || 26 || 0.6
| Mar || 26 || 0.5
|-
|-
| Apr || 39 || 0.8
| Apr || 37 || 0.6
|-
|-
| May || 64 || 1.4
| May || 66 || 1.2
|-
|-
| Jun || 96 || 2.0
| Jun || 100 || 1.8
|-
|-
| Jul || 215 || 4.6
| Jul || 221 || 3.9
|-
|-
| Aug || 312 || 6.6
| Aug || 310 || 5.4
|-
|-
| Sep || 262 || 5.6
| Sep || 280 || 4.9
|-
|-
| Oct || 219 || 4.7
| Oct || 228 || 4.0
|-
|-
| Nov || 134 || 2.9
| Nov || 139 || 2.4
|-
|-
| Dec || 75 || 1.6
| Dec || 69 || 1.2
|-
|-
| Annual || 1485 || 31.7
| Annual || 1518 || 26.6
|-
|-
| colspan="3" style="text-align:center;"|Source: '''JTWC'''<ref>{{cite web|url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/atcr/2005atcr.pdf
| colspan="3" style="text-align:center;"|Source: '''JTWC'''<ref>{{cite report|url=https://www.metoc.navy.mil/jtwc/products/atcr/2015atcr.pdf|title=2015 Annual Tropical Cyclone Report: Western Pacific|year=2015|access-date=2016-07-11|author=Joint Typhoon Warning Center|publisher=United States Navy, United States Air Force}}</ref>
|title=2005 Annual Tropical Cyclone Report: Western Pacific
|year=2005
|accessdate=2007-08-26
|author=[[Joint Typhoon Warning Center]]|publisher=[[United States Navy]]
}}</ref>
|}
|}
Nearly one-third of the world's tropical cyclones form within the western Pacific. This makes this basin the most active on Earth.<ref name="enso">{{cite journal|journal=Climate Research|volume=25|page=43|url=http://www.int-res.com/articles/cr2003/25/c025p043.pdf|title=Examining the ENSO-Typhoon Hypothesis|date=2003-10-08|accessdate=2007-08-18|author=James B. Elsner and Kam-Biu Liu|doi=10.3354/cr025043}}</ref> Pacific typhoons have formed year round, with peak months from August to October. The peak months correspond to that of the [[Atlantic hurricane season]]s. Along with a high storm frequency, this basin also features the most globally [[List of notable tropical cyclones#Most intense storms on record|intense storms]] on record. One of the most recent busy seasons was [[2004 Pacific typhoon season|2004]]. Tropical cyclones form in any month of the year across the northwest Pacific ocean, and concentrate around June and November in the northern Indian ocean. The area just northeast of the Philippines is the most active place on Earth for tropical cyclones to exist. Across the Philippines themselves, activity reaches a minimum in February, before increasing steadily through June, and spiking from July through October, with September being the most active month for tropical cyclones across the [[archipelago]]. Activity falls off significantly in November.<ref>{{cite journal|url=http://www.typhoon2000.ph/stormstats/PhilippineTyphoons1566-1900.pdf|title=Typhoons in the Philippine Islands, 1566-1900|author=Ricardo García-Herrera, Pedro Ribera, Emiliano Hernández and Luis Gimeno|publisher=|journal=Journal of Geophysical Research|volume=112|issue=D6|page=40|year=2006|accessdate=2010-04-13|doi=10.1029/2006JD007370|bibcode=2007JGRD..11206108G}}</ref> The most frequently impacted areas of the Philippines by tropical cyclones are northern [[Luzon]] and eastern [[Visayas]].<ref>{{cite book|author=Colleen A. Sexton|url=http://books.google.com/?id=ffGdShrIrQAC&pg=PA15&lpg=PA15&dq=most+active+typhoon+season+for+the+philippines#PPA2,M1|title=Philippines in Pictures|publisher=Twenty-First Century Books|accessdate=2008-11-01|isbn=9780822526773|year=2006|page=16}}</ref> A ten year average of satellite determined precipitation showed that at least 30&nbsp;percent of the annual rainfall in the northern Philippines could be traced to tropical cyclones, while the southern islands receive less than 10&nbsp;percent of their annual rainfall from tropical cyclones.<ref>{{cite journal|author=Edward B. Rodgers, Robert F. Adler, and Harold F. Pierce|url=http://journals.ametsoc.org/doi/pdf/10.1175/1520-0450%282000%29039%3C1658%3ACOTCTT%3E2.0.CO%3B2|title=Contribution of Tropical Cyclones to the North Pacific Climatological Rainfall as Observed from Satellites|accessdate=2011-03-30|doi=10.1175/1520-0450(2000)039<1658:COTCTT>2.0.CO;2|issue=10|page=1662|journal=Journal of Applied Meteorology|volume=39|date=October 2000|publisher=[[American Meteorological Society]]|bibcode = 2000JApMe..39.1658R|year=2000 }}</ref>
Nearly one-third of the world's tropical cyclones form within the western Pacific. This makes this basin the most active on Earth.<ref name="enso">{{cite journal |author1=James B. Elsner |author2=Kam-Biu Liu |date=2003-10-08 |title=Examining the ENSO-Typhoon Hypothesis |url=https://www.int-res.com/articles/cr2003/25/c025p043.pdf |url-status=live |journal=Climate Research |volume=25 |page=43 |bibcode=2003ClRes..25...43E |doi=10.3354/cr025043 |issn=0936-577X |archive-url=https://web.archive.org/web/20080409132416/http://www.int-res.com/articles/cr2003/25/c025p043.pdf |archive-date=2008-04-09 |access-date=2007-08-18 |doi-access=free}}</ref> Pacific typhoons have formed year-round, with peak months from August to October. The peak months correspond to that of the [[Atlantic hurricane season]]s. Along with a high storm frequency, this basin also features the most globally [[List of notable tropical cyclones#Major records|intense storms]] on record. One of the most recent busy seasons was [[2013 Pacific typhoon season|2013]]. Tropical cyclones form in any month of the year across the northwest Pacific Ocean and concentrate around June and November in the northern Indian Ocean. The area just northeast of the Philippines is the most active place on Earth for tropical cyclones to exist.


Across the Philippines themselves, activity reaches a minimum in February, before increasing steadily through June and spiking from July through October, with September being the most active month for tropical cyclones across the [[archipelago]]. Activity falls off significantly in November, although [[Typhoon Haiyan]], the strongest Philippine typhoon on record, was a November typhoon.<ref>{{cite journal |first1=Ricardo |last1=García-Herrera |first2=Pedro |last2=Ribera |first3=Emiliano |last3=Hernández |first4=Luis |last4=Gimeno |year=2006 |title=Typhoons in the Philippine Islands, 1566–1900 |url=http://www.typhoon2000.ph/stormstats/PhilippineTyphoons1566-1900.pdf |url-status=live |journal=Journal of Geophysical Research |volume=112 |issue=D6 |page=40 |bibcode=2007JGRD..112.6108G |bibcode-access=free |doi=10.1029/2006JD007370 |doi-access=free |issn=0148-0227 |archive-url=https://web.archive.org/web/20091007120619/http://www.typhoon2000.ph/stormstats/PhilippineTyphoons1566-1900.pdf |archive-date=2009-10-07 |access-date=2010-04-13}}</ref> The most frequently impacted areas of the Philippines by tropical cyclones are northern and central [[Luzon]] and eastern [[Visayas]].<ref>{{cite book|author=Colleen A. Sexton|url=https://archive.org/details/philippinesinpic0000sext|url-access=registration|quote=most active typhoon season for the Philippines.|title=Philippines in Pictures|publisher=Twenty-First Century Books|access-date=2008-11-01|isbn=978-0-8225-2677-3|year=2006|page=[https://archive.org/details/philippinesinpic0000sext/page/16 16]}}</ref> A ten-year average of satellite determined precipitation showed that at least 30&nbsp;percent of the annual rainfall in the northern Philippines could be traced to tropical cyclones, while the southern islands receive less than 10&nbsp;percent of their annual rainfall from tropical cyclones.<ref>{{cite journal |author1=Edward B. Rodgers |author2=Robert F. Adler |author3=Harold F. Pierce |date=October 2000 |title=Contribution of Tropical Cyclones to the North Pacific Climatological Rainfall as Observed from Satellites |journal=Journal of Applied Meteorology |volume=39 |issue=10 |page=1662 |bibcode=2000JApMe..39.1658R |doi=10.1175/1520-0450(2000)039<1658:COTCTT>2.0.CO;2 |issn=1558-8424 |hdl-access=free |hdl=2060/19990109670}}</ref> The genesis and intensity of typhoons are also modulated by slow variation of the sea surface temperature and circulation features following a near-10-year frequency.<ref name="WangClark2010">{{cite journal |last1=Wang |first1=Shih-Yu |last2=Clark |first2=Adam J. |date= 2011 |title=Quasi-decadal spectral peaks of tropical western Pacific SSTs as a precursor for tropical cyclone threat |journal= Geophysical Research Letters |language=en |volume=37 |issue=21 |pages=n/a |doi=10.1029/2010GL044709 |issn=0094-8276 |pmid=|bibcode=2010GeoRL..3721810W |s2cid=39433860 |doi-access=free }}</ref>
==Paths==
[[Image:Pacific typhoon tracks 1980-2005.jpg|thumb|200px|Tracks of all tropical cyclones in the northernwestern [[Pacific Ocean]] between 1980 and 2005. The vertical line to the right is the [[International Date Line]].]]
Most tropical cyclones form on the side of the subtropical ridge closer to the equator, then move poleward past the ridge axis before recurving north and northeast into the main belt of the [[Westerlies]].<ref>{{cite web|author=Joint Typhoon Warning Center|year=2006|url=http://www.nrlmry.navy.mil/forecaster_handbooks/Philippines2/Forecasters%20Handbook%20for%20the%20Philippine%20Islands%20and%20Surrounding%20Waters%20Typhoon%20Forecasting.3.pdf|title=3.3 JTWC Forecasting Philosophies|publisher=[[United States Navy]]|accessdate=2007-02-11}}</ref> When the subtropical ridge position shifts due to [[El Niño-Southern Oscillation|El Niño]], so will the preferred tropical cyclone tracks. Areas west of Japan and [[Korea]] tend to experience much fewer September–November tropical cyclone impacts during El Niño and neutral years. During El Niño years, the break in the subtropical ridge tends to lie near [[130th meridian east|130°E]] which would favor the Japanese archipelago.<ref name="China"/> During La Niña years, the formation of tropical cyclones, along with the subtropical ridge position, shifts westward across the western Pacific ocean, which increases the landfall threat to China.<ref name="China">{{cite journal|author=M. C. Wu, W. L. Chang, and W. M. Leung|year=2003|url=http://ams.allenpress.com/perlserv/?request=get-document&doi=10.1175%2F1520-0442(2004)017%3C1419:IOENOE%3E2.0.CO%3B2|title=Impacts of El Nino-Southern Oscillation Events on Tropical Cyclone Landfalling Activity in the Western North Pacific|volume=17|journal=Journal of Climate|pages=1419–1428|accessdate=2007-02-11|doi=10.1175/1520-0442(2004)017<1419:IOENOE>2.0.CO;2|issue=6|bibcode=2004JCli...17.1419W}}</ref> Those that form near the [[Marshall Islands]] find their way to [[Jeju-do|Jeju Island]], Korea.<ref>{{cite book|url=http://books.google.com/?id=Za4my8EshDEC&pg=PA51&dq=where+most+typhoons+form+northwest+Pacific#v=onepage&q&f=false|page=51|title=The architecture of ideology: neo-Confucian imprinting on Cheju Island, Korea|author=David J. Nemeth|year=1987|publisher=University of California Press|isbn=9780520097131|accessdate=2011-03-06}}</ref>


== Paths ==
Typhoon paths follow three general directions.<ref name="enso"/>
{{See also|Monsoon trough}}
* Straight track (or straight runner). A general westward path affects the [[Philippines]], southern China, Taiwan, and [[Vietnam]].
[[File:Pacific typhoon tracks 1980-2005.jpg|thumb|Tracks of all tropical cyclones in the northernwestern [[Pacific Ocean]] between 1980 and 2005. The vertical line to the right is the [[International Date Line]].]]
* A parabolic, recurving track. Storms recurving affect eastern China, Taiwan, Korea, and Japan.
Most tropical cyclones form on the side of the subtropical ridge closer to the equator, then move poleward past the ridge axis before recurving north and northeast into the main belt of the [[westerlies]].<ref>{{cite web|author=Joint Typhoon Warning Center|year=2006|url=http://www.nrlmry.navy.mil/forecaster_handbooks/Philippines2/Forecasters%20Handbook%20for%20the%20Philippine%20Islands%20and%20Surrounding%20Waters%20Typhoon%20Forecasting.3.pdf|title=3.3 JTWC Forecasting Philosophies|publisher=[[United States Navy]]|access-date=2007-02-11|archive-date=2012-07-05|archive-url=https://web.archive.org/web/20120705161830/http://www.nrlmry.navy.mil/forecaster_handbooks/Philippines2/Forecasters%20Handbook%20for%20the%20Philippine%20Islands%20and%20Surrounding%20Waters%20Typhoon%20Forecasting.3.pdf|url-status=live}}</ref> Most typhoons form in a region in the northwest Pacific known as typhoon alley, where the planet's most powerful tropical cyclones most frequently develop.<ref name="typhoon alley">{{cite web|url=https://weather.com/storms/typhoon/news/typhoon-alley-most-powerful-cyclone-earth|title=Typhoon Alley: Where the Planet's Most Intense Tropical Cyclones Most Frequently Happen|author=Jonathan Belles|publisher=[[The Weather Company]]|date=July 6, 2016|access-date=April 12, 2019|archive-date=April 12, 2019|archive-url=https://web.archive.org/web/20190412095427/https://weather.com/storms/typhoon/news/typhoon-alley-most-powerful-cyclone-earth|url-status=live}}</ref> When the subtropical ridge shifts due to [[El Niño-Southern Oscillation|El Niño]], so will the preferred tropical cyclone tracks. Areas west of Japan and [[Korea]] tend to experience many fewer September–November tropical cyclone impacts during El Niño and neutral years. During El Niño years, the break in the subtropical ridge tends to lie near [[130th meridian east|130°E]], which would favor the Japanese archipelago.<ref name="China" /> During La Niña years, the formation of tropical cyclones, and the subtropical ridge position, shift westward across the western Pacific Ocean, which increases the landfall threat to [[China]] and greater intensity to [[Philippines]].<ref name="China">{{cite journal |author1=M. C. Wu |author2=W. L. Chang |author3=W. M. Leung |year=2003 |title=Impacts of El Nino-Southern Oscillation Events on Tropical Cyclone Landfalling Activity in the Western North Pacific |journal=Journal of Climate |volume=17 |issue=6 |pages=1419–1428 |bibcode=2004JCli...17.1419W |citeseerx=10.1.1.461.2391 |doi=10.1175/1520-0442(2004)017<1419:IOENOE>2.0.CO;2 |issn=0894-8755}}</ref> Those that form near the [[Marshall Islands]] find their way to [[Jeju Island]], Korea.<ref>{{cite book|url=https://books.google.com/books?id=Za4my8EshDEC&q=where+most+typhoons+form+northwest+Pacific&pg=PA51|page=51|title=The architecture of ideology: neo-Confucian imprinting on Cheju Island, Korea|author=David J. Nemeth|year=1987|publisher=University of California Press|isbn=978-0-520-09713-1|access-date=2011-03-06|archive-date=2022-05-02|archive-url=https://web.archive.org/web/20220502112033/https://books.google.com/books?id=Za4my8EshDEC&q=where+most+typhoons+form+northwest+Pacific&pg=PA51|url-status=live}}</ref> Typhoon paths follow three general directions.<ref name="enso" />
* Northward track. From point of origin, the storm follows a northerly direction, only affecting small islands.
* Straight track (or straight runner). A general westward path affects the [[Philippines]], southern China, [[Taiwan]], and [[Vietnam]].
* A parabolic recurving track. Storms recurving affect the eastern Philippines, eastern China, Taiwan, Korea, Japan, and the Russian Far East.
* Northward track. From point of origin, the storm follows a northerly direction, only affecting small islands.


A rare few storms, like [[Hurricane John (1994)|Hurricane John]], were redesignated as typhoons as its track originated from the Eastern/Central Pacific and moved its way into the western Pacific.
A rare few storms, like [[Hurricane John (1994)|Hurricane John]], were redesignated as typhoons as they originated in the Eastern/Central Pacific and moved into the western Pacific.


==Basin monitoring==
== Basin monitoring ==
Within the Western Pacific, [[Regional Specialized Meteorological Center|RSMC Tokyo-Typhoon Center]], part of the [[Japan Meteorological Agency]] has had the official warning responsibility for the whole of the Western Pacific since 1989,<ref name="JMA2000"/> and the naming responsibility for systems of tropical storm strength or greater since 2000.<ref name="HKO"/> However each [[WMO|National Meteorological and Hydrological Service]] within the western Pacific has the responsibility for issuing warnings for land areas about tropical cyclones affecting their country, such as the Joint Typhoon Warning Center for United States agencies,<ref>{{cite web|url=http://www.usno.navy.mil/JTWC/products-and-services-notice|title=Products and Service Notice|accessdate=2011-03-11|year=2011|author=Naval Meteorology and Oceanography Command|publisher=[[United States Navy]]}}</ref> the [[Philippine Atmospheric, Geophysical and Astronomical Services Administration]] (PAGASA) for interests in the island archipelago nation,<ref name="HKO">{{cite web|url=http://www.pagasa.dost.gov.ph/mission.shtml|title=Mission/Vision|author=Philippine Atmospheric, Geophysical & Astronomical Services Administration|year=2004|accessdate=2011-03-11}}</ref> and the [[Hong Kong Observatory]] for storms which come close enough to cause the issuance of [[Hong Kong tropical cyclone warning signals|warning signals]].<ref>{{cite web|url=http://www.weather.gov.hk/publica/tc/tc2009.pdf|date=September 2010|accessdate=2011-03-11|title=Tropical Cyclones in 2009|author=Hong Kong Observatory|pages=18–19}}</ref>
Within the Western Pacific, [[Regional Specialized Meteorological Center|RSMC Tokyo-Typhoon Center]], part of the [[Japan Meteorological Agency]], has had the official warning responsibility for the whole of the Western Pacific since 1989,<ref name="JMA2000">{{cite web|url=http://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/AnnualReport/2000/Text/Text2000.pdf|pages=iii,11|title=Annual Report on Activities of the RSMC Tokyo – Typhoon Center: 2000|author=Japan Meteorological Agency|date=2001-05-25|access-date=2011-03-11|author-link=Japan Meteorological Agency|archive-date=2013-12-12|archive-url=https://web.archive.org/web/20131212234149/http://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/AnnualReport/2000/Text/Text2000.pdf|url-status=live}}</ref> and the naming responsibility for systems of tropical storm strength or greater since 2000.<ref name="HKO" /> However each [[WMO|National Meteorological and Hydrological Service]] within the western Pacific has the responsibility for issuing warnings for land areas about tropical cyclones affecting their country, such as the Joint Typhoon Warning Center for United States agencies,<ref>{{cite web|url=http://www.usno.navy.mil/JTWC/products-and-services-notice|title=Products and Service Notice|access-date=2011-03-11|year=2011|author=Naval Meteorology and Oceanography Command|publisher=[[United States Navy]]|archive-date=2017-06-09|archive-url=https://web.archive.org/web/20170609092158/http://www.usno.navy.mil/JTWC/products-and-services-notice|url-status=live}}</ref> the [[Philippine Atmospheric, Geophysical and Astronomical Services Administration]] (PAGASA) for interests in the island archipelago nation,<ref>{{cite web|url=http://www.pagasa.dost.gov.ph/mission.shtml |title=Mission/Vision |author=Philippine Atmospheric, Geophysical & Astronomical Services Administration |year=2004 |access-date=2011-03-11 |url-status=dead |archive-url=https://web.archive.org/web/20040422082657/http://www.pagasa.dost.gov.ph/mission.shtml |archive-date=2004-04-22 }}</ref> and the [[Hong Kong Observatory]] for storms that come close enough to cause the issuance of [[Hong Kong tropical cyclone warning signals|warning signals]].<ref>{{cite web|url=http://www.weather.gov.hk/publica/tc/tc2009.pdf|date=September 2010|access-date=2011-03-11|title=Tropical Cyclones in 2009|author=Hong Kong Observatory|pages=18–19|archive-date=2017-06-29|archive-url=https://web.archive.org/web/20170629115042/http://www.weather.gov.hk/publica/tc/tc2009.pdf|url-status=dead}}</ref>


===Name sources===
=== Name sources and name list ===
The list of names consists of entries from 17 East Asian nations and the United States who have territories directly affected by typhoons. The submitted names are arranged into five lists; and each list is cycled with each year. Unlike tropical cyclones in other parts of the world, typhoons are not named after people. Instead, they generally refer to animals, flowers, astrological signs, and a few personal names. However, PAGASA retains its own naming list, which does consist of human names.<ref name="TyphoonBasic">
The list of names consists of entries from 14 southeast and east Asian nations and regions and the United States who have territories directly affected by typhoons. The submitted names are arranged into a list, the names on the list will be used from up to down, from left to right. When all names on the list are used, it will start again from the left-top corner. When a typhoon causes damage in a region, the affected region can request for retiring the name in the next session of the ESCAP/WMO Typhoon Committee. A new name will be decided by the region whose name was retired.
{{cite news|url=http://www.usatoday.com/weather/hurricane/typhoon-names.htm|title=How typhoons are named|accessdate=2008-08-18|work=USA Today | date=2007-11-01}}</ref> Therefore, a typhoon can possibly have two names. Storms that cross the date line from the central Pacific retain their original name, but the designation of hurricane becomes typhoon. In Japan, typhoons are also given a numerical designation according to the sequence of their occurrence in the calendar year.<ref name="JMA2000">{{cite web|url=http://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/AnnualReport/2000/Text/Text2000.pdf|pages=iii,11|title=Annual Report on Activities of the RSMC Tokyo – Typhoon Center: 2000|author=[[Japan Meteorological Agency]]|date=2001-05-25|accessdate=2011-03-11}}</ref>


Unlike tropical cyclones in other parts of the world, typhoons are not named after people. Instead, they generally refer to animals, flowers, astrological signs, and a few personal names. However, Philippines (PAGASA) retains its own naming list, which consists of both human names and other objects.<ref name="TyphoonBasic">{{cite news|url=https://www.usatoday.com/weather/hurricane/typhoon-names.htm|title=How typhoons are named|access-date=2008-08-18|work=USA Today|date=2007-11-01|archive-date=2008-09-30|archive-url=https://web.archive.org/web/20080930180613/http://www.usatoday.com/weather/hurricane/typhoon-names.htm|url-status=dead }}</ref> Japan and some other East Asian countries also assign numbers to typhoons.<ref>{{Cite web |title=Digital Typhoon: Typhoon Names (Asian Names) |url=http://agora.ex.nii.ac.jp/digital-typhoon/help/tcnames.html.en#:~:text=Number-based%20conventions%20are%20based,typhoon%20of%20the%20typhoon%20season. |access-date=2023-07-31 |website=agora.ex.nii.ac.jp}}</ref>
{{clear}}


Storms that cross the date line from the central Pacific retain their original name, but the designation of hurricane becomes typhoon.
==Records==

{| class="wikitable" style="width:300px; text-align:center; margin:0 1em; float:right;" HL +
{| class="wikitable" style="width:100%"
|+List of Western Pacific tropical cyclone names <small>(as of 2024)</small>
|-
|-
!scope="col" rowspan=2 | List
!Total<br />Storms
!scope="col" colspan=14| Contributing nations/regions
!Year
|-
!Tropical<br />Storms
!scope="col"|{{KHM}}
!Typhoons
!scope="col"|{{CHN}}
!Super<br />Typhoons
!scope="col"|{{PRK}}
!scope="col"|{{HKG-CHN}}
!scope="col"|{{JPN}}
!scope="col"|{{LAO}}
!scope="col"|{{MAC-CHN}}
!scope="col"|{{MYS}}
!scope="col"|{{FSM}}
!scope="col"|{{PHI}}
!scope="col"|{{KOR}}
!scope="col"|{{THA}}
!scope="col"|{{USA}}
!scope="col"|{{VIE}}
|-
!scope="row" rowspan=2| 1
|[[Typhoon Damrey|Damrey]]||[[Typhoon Haikui (disambiguation)|Haikui]]||[[Typhoon Kirogi|Kirogi]]||[[Typhoon Kai-tak|Yun-yeung]]||[[Typhoon Koinu|Koinu]]||[[Typhoon Bolaven|Bolaven]]||[[Typhoon Sanba (disambiguation)|Sanba]]||[[Typhoon Jelawat|Jelawat]]||[[Typhoon Ewiniar|Ewiniar]]||[[Typhoon Maliksi (disambiguation)|Maliksi]]||[[Typhoon Gaemi|Gaemi]]||[[Typhoon Prapiroon|Prapiroon]]||[[Typhoon Maria|Maria]]||[[Typhoon Son-Tinh (disambiguation)|Son-Tinh]]
|-
|[[Typhoon Bopha (disambiguation)|Ampil]]||[[Typhoon Wukong|Wukong]]||[[Tropical Storm Sonamu|Jongdari]]||[[Typhoon Shanshan|Shanshan]]||[[Typhoon Yagi|Yagi]]||[[Typhoon Leepi (disambiguation)|Leepi]]||[[Typhoon Bebinca|Bebinca]]||[[List of tropical storms named Rumbia|Pulasan]]||[[Typhoon Soulik|Soulik]]||[[Typhoon Cimaron|Cimaron]]||[[Typhoon Jebi|Jebi]]||[[Tropical Storm Mangkhut|Krathon]]||[[List of typhoons named Utor|Barijat]]||[[Typhoon Trami (disambiguation)|Trami]]
|-
!scope="row" rowspan=2| 2
|[[Typhoon Kong-rey|Kong-rey]]||[[List of storms named Yutu|Yinxing]]||[[Typhoon Toraji|Toraji]]||[[Typhoon Man-yi|Man-yi]]||[[Typhoon Usagi|Usagi]]||[[Typhoon Pabuk|Pabuk]]||[[Typhoon Wutip|Wutip]]||[[Typhoon Sepat|Sepat]]||[[Typhoon Fitow (disambiguation)|Mun]]||[[Typhoon Danas|Danas]]||[[Typhoon Nari|Nari]]||[[Typhoon Wipha|Wipha]]||[[List of storms named Francisco|Francisco]]||[[Typhoon Lekima|Co-may]]
|-
|[[Typhoon Krosa|Krosa]]||[[Typhoon Bailu|Bailu]]||[[Typhoon Podul|Podul]]||[[Typhoon Lingling|Lingling]]||[[Typhoon Kajiki|Kajiki]]||[[Typhoon Faxai|Nongfa]]||[[Typhoon Peipah|Peipah]]||[[Tropical Storm Tapah|Tapah]]||[[Typhoon Mitag|Mitag]]||[[Typhoon Hagibis (disambiguation)|Ragasa]]||[[Typhoon Neoguri|Neoguri]]||[[Typhoon Rammasun (disambiguation)|Bualoi]]||[[Typhoon Matmo|Matmo]]||[[Typhoon Halong|Halong]]
|-
!scope="row" rowspan=2| 3
|[[Typhoon Nakri|Nakri]]||[[Typhoon Fengshen|Fengshen]]||[[Typhoon Kalmaegi|Kalmaegi]]||[[Typhoon Fung-wong|Fung-wong]]||[[Tropical Storm Kammuri|Koto]]||[[Typhoon Phanfone|Nokaen]]||[[Tropical Storm Vongfong|Penha]]||[[Typhoon Nuri|Nuri]]||[[Typhoon Sinlaku|Sinlaku]]||[[Typhoon Hagupit|Hagupit]]||[[Typhoon Jangmi|Jangmi]]||[[Tropical Storm Mekkhala|Mekkhala]]||[[Typhoon Higos|Higos]]||[[Typhoon Bavi|Bavi]]
|-
|[[Typhoon Maysak|Maysak]]||[[Typhoon Haishen|Haishen]]||[[Typhoon Noul|Noul]]||[[Typhoon Dolphin|Dolphin]]||[[Typhoon Kujira|Kujira]]||[[Typhoon Chan-hom|Chan-hom]]||[[Typhoon Linfa|Peilou]]||[[Typhoon Nangka|Nangka]]||[[List of tropical storms named Soudelor|Saudel]]||[[Typhoon Molave|Narra]]||[[Typhoon Goni|Gaenari]]||[[Typhoon Atsani (disambiguation)|Atsani]]||[[Typhoon Etau|Etau]]||[[Typhoon Vamco|Bang-Lang]]
|-

|-
!scope="row" rowspan=2| 4
|[[Typhoon Krovanh|Krovanh]]||[[Typhoon Dujuan|Dujuan]]||[[List of storms named Mujigae|Surigae]]||[[Typhoon Choi-wan|Choi-wan]]||[[List of tropical storms named Koppu|Koguma]]||[[Typhoon Champi (disambiguation)|Champi]]||[[Typhoon Parma (disambiguation)|In-fa]]||[[Typhoon Melor (disambiguation)|Cempaka]]||[[Typhoon Nepartak|Nepartak]]||[[Typhoon Lupit|Lupit]]||[[Typhoon Mirinae|Mirinae]]||[[Typhoon Nida|Nida]]||[[Tropical Storm Omais|Omais]]||[[Typhoon Conson|Luc-binh]]
|-
|[[Typhoon Chanthu|Chanthu]]||[[Typhoon Dianmu|Dianmu]]||[[Typhoon Mindulle|Mindulle]]||[[Typhoon Lionrock|Lionrock]]||[[Typhoon Kompasu|Tokei]]||[[Typhoon Namtheun|Namtheun]]||[[Tropical Storm Malou|Malou]]||[[List of tropical storms named Meranti|Nyatoh]]||[[List of storms named Rai|Sarbul]]||[[Typhoon Malakas|Amuyao]]||[[Typhoon Megi|Gosari]]||[[Typhoon Chaba|Chaba]]||[[Typhoon Aere|Aere]]||[[Typhoon Songda|Songda]]
|-
!scope="row" rowspan=2| 5
|[[Typhoon Sarika (disambiguation)|Trases]]||[[Tropical Storm Haima|Mulan]]||[[Typhoon Meari|Meari]]||[[Typhoon Ma-on|Tsing-ma]]||[[Typhoon Tokage|Tokage]]||[[Typhoon Nock-ten (disambiguation)|Ong-mang]]||[[Typhoon Muifa|Muifa]]||[[Typhoon Merbok|Merbok]]||[[Typhoon Nanmadol|Nanmadol]]||[[Typhoon Talas|Talas]]||[[Typhoon Noru|Hodu]]||[[Tropical Storm Kulap|Kulap]]||[[Typhoon Roke|Roke]]||[[Typhoon Sonca|Sonca]]
|-
|[[Typhoon Nesat|Nesat]]||[[Typhoon Haitang|Haitang]]||[[Typhoon Nalgae|Jamjari]]||[[Typhoon Banyan|Banyan]]||[[Tropical Storm Hato|Yamaneko]]||[[Tropical Storm Pakhar|Pakhar]]||[[Tropical Storm Sanvu|Sanvu]]||[[Typhoon Mawar|Mawar]]||[[Typhoon Guchol|Guchol]]||[[Typhoon Talim|Talim]]||[[Tropical Storm Doksuri|Doksuri]]||[[Typhoon Khanun|Khanun]]||[[Tropical Storm Vicente|Lan]]||[[Typhoon Saola|Saola]]
|-
!colspan=20|References:<ref>{{Cite web|url=https://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/tyname.html|title=List of names for tropical cyclones adopted by the ESCAP/WMO Typhoon Committee for the western North Pacific and the South China Sea (valid as of 2019)|website=[[Japan Meteorological Agency]]: [[Regional Specialized Meteorological Center|RSMC Tokyo – Typhoon Center]]|publisher=Japan Meteorological Agency|author=RSMC Tokyo-Typhoon Center|access-date=October 25, 2019|archive-date=January 5, 2021|archive-url=https://web.archive.org/web/20210105031223/http://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/tyname.html|url-status=live}}</ref>
|}

== Records ==
{| class="wikitable" style="width:300px; text-align:center; margin:0 1em; float:right; clear:right"
|-
! Total<br />storms
! Year
! Tropical<br />storms
! Typhoons
! Super<br />typhoons
|-
|-
| 39 || [[1964 Pacific typhoon season|1964]] || 13 || 19 || 7
| 39 || [[1964 Pacific typhoon season|1964]] || 13 || 19 || 7
Line 117: Line 178:
| 32 || [[1974 Pacific typhoon season|1974]] || 16 || 16 || 0
| 32 || [[1974 Pacific typhoon season|1974]] || 16 || 16 || 0
|-
|-
| 31 || [[1989 Pacific typhoon season|1989]]<br />[[1992 Pacific typhoon season|1992]] || 10<br />9 || 15<br />17 || 6<br />5
| 31 || [[1989 Pacific typhoon season|1989]]<br />[[1992 Pacific typhoon season|1992]]<br />[[2013 Pacific typhoon season|2013]] || 10<br />13<br />18 || 15<br />17<br />8 || 6<br />5<br />5
|-
|-
| 30 || [[1962 Pacific typhoon season|1962]]<br />[[1966 Pacific typhoon season|1966]]<br />[[1972 Pacific typhoon season|1972]]<br />[[1990 Pacific typhoon season|1990]]<br />[[2004 Pacific typhoon season|2004]] || 7<br />10<br />8<br />9<br />10 || 17<br />17<br />20<br />17<br />13 || 6<br />3<br />2<br />4<br />7
| 30 || [[1962 Pacific typhoon season|1962]]<br />[[1966 Pacific typhoon season|1966]]<br />[[1972 Pacific typhoon season|1972]]<br />[[1990 Pacific typhoon season|1990]]<br />[[2004 Pacific typhoon season|2004]] || 7<br />10<br />8<br />9<br />10<br /> || 17<br />17<br />20<br />17<br />13 || 6<br />3<br />2<br />4<br />7
|}
|}
The most active Western Pacific typhoon season was in 1964, when 39&nbsp;storms of tropical storm strength formed. The least activity seen in the northwest Pacific ocean was during the [[2010 Pacific typhoon season]], when only 14&nbsp;tropical storms and seven typhoons formed. In the Philippines, the most active season, since 1945, for tropical cyclone strikes was [[1993 Pacific typhoon season|1993]] when nineteen tropical cyclones moved through the country.<ref>{{cite web|author=[[Joint Typhoon Warning Center]]|year=2009|url=http://www.typhooncommittee.org/41st/docs/TC2_MemberReport2008_PHILIPPINES1.pdf|title=Member Report Republic of the Philippines|work=[[Philippine Atmospheric, Geophysical and Astronomical Services Administration]]|publisher=[[World Meteorological Organization]]|accessdate=2010-04-14}}</ref> There was only one tropical cyclone which moved through the Philippines in [[1958 Pacific typhoon season|1958]].<ref>{{cite web|author=[[Joint Typhoon Warning Center]]|year=1959|title=1958|publisher=[[United States Navy]]}}</ref> The [[2004 Pacific typhoon season]] was the busiest for Okinawa since 1957.<ref>{{cite news|url=http://www.stripes.com/news/preparation-critical-for-japan-s-coming-typhoon-season-1.33979|publisher=Stars and Stripes|title=Preparation critical for Japan's coming typhoon season|author=Erik Slavin|date=2005-05-30|accessdate=2011-03-06}}</ref> Within [[Guangdong]] in southern China, during the past thousand years, the most active decades for typhoon strikes were the 1660s and 1670s.<ref>{{cite journal|journal=Annals of the Association of American Geographers|year=2001|author=Kam-Biu Liu, Caiming Shen, and Kin-Sheun Louie|title=A 1,000-Year History of Typhoon Landfalls in Guangdong, Southern China, Reconstructed from Chinese Historical Documentary Records|volume=91|issue=3|pages=453–464|issn=00045608|doi=10.1111/0004-5608.00253}}</ref>
The most active Western Pacific typhoon season was in [[1964 Pacific typhoon season|1964]],{{citation needed|date=September 2012}} when 39&nbsp;storms of tropical storm strength formed. Only 15 seasons had 30 or more storms developing since reliable records began. The least activity seen in the northwest Pacific Ocean was during the [[2010 Pacific typhoon season]], when only 14&nbsp;tropical storms and seven typhoons formed. In the Philippines, the most active season since 1945 for tropical cyclone strikes was [[1993 Pacific typhoon season|1993]], when nineteen tropical cyclones moved through the country.<ref>{{cite web|author=Joint Typhoon Warning Center|year=2009|url=http://www.typhooncommittee.org/41st/docs/TC2_MemberReport2008_PHILIPPINES1.pdf|title=Member Report Republic of the Philippines|work=[[Philippine Atmospheric, Geophysical and Astronomical Services Administration]]|publisher=[[World Meteorological Organization]]|access-date=2010-04-14|author-link=Joint Typhoon Warning Center|archive-date=2019-09-12|archive-url=https://web.archive.org/web/20190912115140/http://www.typhooncommittee.org/41st/docs/TC2_MemberReport2008_PHILIPPINES1.pdf|url-status=live}}</ref> There was only one tropical cyclone that moved through the Philippines in [[1958 Pacific typhoon season|1958]]. The [[2004 Pacific typhoon season]] was the busiest for Okinawa since 1957.<ref>{{cite news|url=http://www.stripes.com/news/preparation-critical-for-japan-s-coming-typhoon-season-1.33979|publisher=Stars and Stripes|title=Preparation critical for Japan's coming typhoon season|author=Erik Slavin|date=2005-05-30|access-date=2011-03-06|archive-date=2011-06-28|archive-url=https://web.archive.org/web/20110628213824/http://www.stripes.com/news/preparation-critical-for-japan-s-coming-typhoon-season-1.33979|url-status=live}}</ref> Within [[Guangdong]] in southern China, during the past thousand years, the most active decades for typhoon strikes were the 1660s and 1670s.<ref>{{cite journal|journal=Annals of the Association of American Geographers|year=2001|author1=Kam-Biu Liu |author2=Caiming Shen |author3=Kin-Sheun Louie |title=A 1,000-Year History of Typhoon Landfalls in Guangdong, Southern China, Reconstructed from Chinese Historical Documentary Records|volume=91|issue=3|pages=453–464|issn=0004-5608|doi=10.1111/0004-5608.00253|s2cid=53066209}}</ref>


The most intense storm on record was [[Typhoon Tip]] in the northwestern Pacific Ocean in 1979, which reached a minimum pressure of {{Convert|870|hPa|inHg}} and maximum sustained wind speeds of 165&nbsp;knots (85&nbsp;m/s, 190&nbsp;mph, 310&nbsp;km/h).<ref name="JTWC">{{cite journal|author=George M. Dunnavan, John W. Diercks|year=1980|publisher=American Meteorological Society|issue=11|pages=1915–1923|title=An Analysis of Super Typhoon Tip (October 1979)|journal=Monthly Weather Review|volume=108|url=http://journals.ametsoc.org/doi/pdf/10.1175/1520-0493%281980%29108%3C1915%3AAAOSTT%3E2.0.CO%3B2|accessdate=2011-03-31|doi=10.1175/1520-0493(1980)108<1915:AAOSTT>2.0.CO;2|bibcode = 1980MWRv..108.1915D|issn=1520-0493 }}</ref> The deadliest typhoon of the 20th century was [[Typhoon Nina (1975)|Typhoon Nina]] killed nearly 100,000 in China in 1975 due to a flood that caused 12 reservoirs to fail.<ref>{{cite web|url=http://www.aoml.noaa.gov/hrd/iwtc/AndersonBerry5-1.html|title=Fifth International Workshop on Tropycal Cyclones: Topic 5.1: Societal Impacts of Tropical Cyclones.|last=Anderson-Berry|first=Linda J.|coauthors=Weyman James C.|date=2008-02-26|work=World Meteorological Organization|publisher=National Oceanic and Atmospheric Administration|accessdate=2011-03-31}}</ref> After [[Typhoon Morakot]] landed in Taiwan at midnight on August 8, 2009, almost the entire southern region of Taiwan ([[Chiayi County]]/[[Chiayi City]], [[Tainan County]]/[[Tainan City]] (now merged as Tainan), [[Kaohsiung County]]/[[Kaohsiung City]] (now merged as Kaohsiung), and [[Pingtung County]]) and parts of [[Taitung County]] and [[Nantou County]] were flooded by record-breaking heavy rain. The rainfall in [[Pingtung County]] reached {{convert|2327|mm}},<ref>{{cite web|url=http://wmo.asu.edu/Taiwan-rainfall-record-investigation|author=Arizona State University|title=Taiwan Rainfall Record Investigation|date=2009-08-12|accessdate=2011-03-06}}</ref> breaking all rainfall records of any single place in Taiwan induced by a single typhoon,<ref>{{cite news|url=http://www.chinapost.com.tw/taiwan/national/national-news/2009/08/09/219677/RECORD-RAINS.htm|title=Record rains in south|publisher=The China Post|accessdate=2009-08-09|date=2009-08-09}}</ref> and making the cyclone the wettest known typhoon.
The highest reliably-estimated [[maximum sustained wind]]s on record for a typhoon was that of [[Typhoon Haiyan]] at {{convert|195|mph|km/h|order=flip|abbr=on}} shortly before its landfall in the central [[Philippines]] on November 8, 2013.<ref>{{cite news |url=https://www.washingtonpost.com/blogs/capital-weather-gang/wp/2013/11/07/super-typhoon-haiyan-closes-in-on-philippines-among-strongest-storms-ever/ |title=Among Strongest Storms Ever |last=Samenow |first=Jason |author2=McNoldy Brian |newspaper=The Washington Post |date=2013-11-08 |access-date=2013-11-08 |archive-date=2013-11-08 |archive-url=https://web.archive.org/web/20131108103028/http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2013/11/07/super-typhoon-haiyan-closes-in-on-philippines-among-strongest-storms-ever/ |url-status=live }}</ref> The most intense storm based on minimum pressure was [[Typhoon Tip]] in the northwestern Pacific Ocean in 1979, which reached a minimum pressure of {{Convert|870|hPa|inHg}} and maximum sustained wind speeds of 165&nbsp;knots (85&nbsp;m/s, 190&nbsp;mph, 310&nbsp;km/h).<ref name="JTWC">{{cite journal|author1=George M. Dunnavan |author2=John W. Diercks |year=1980|issue=11|pages=1915–1923|title=An Analysis of Super Typhoon Tip (October 1979)|journal=Monthly Weather Review|volume=108|doi=10.1175/1520-0493(1980)108<1915:AAOSTT>2.0.CO;2|bibcode = 1980MWRv..108.1915D|issn=1520-0493 |doi-access=free}}</ref> The deadliest typhoon of the 20th century was [[Typhoon Nina (1975)|Typhoon Nina]], which killed nearly 100,000 in China in 1975 due to a flood that caused 12 reservoirs to fail.<ref>{{cite web|url=http://www.aoml.noaa.gov/hrd/iwtc/AndersonBerry5-1.html|title=Fifth International Workshop on Tropycal Cyclones: Topic 5.1: Societal Impacts of Tropical Cyclones.|last=Anderson-Berry|first=Linda J.|author2=Weyman James C.|date=2008-02-26|work=World Meteorological Organization|publisher=National Oceanic and Atmospheric Administration|access-date=2011-03-31|archive-date=2012-11-14|archive-url=https://web.archive.org/web/20121114001936/http://www.aoml.noaa.gov/hrd/iwtc/AndersonBerry5-1.html|url-status=live}}</ref> After [[Typhoon Morakot]] landed in Taiwan at midnight on August 8, 2009, almost the entire southern region of Taiwan ([[Chiayi County]]/[[Chiayi City]], [[Tainan County]]/[[Tainan City]] (now merged as Tainan), [[Kaohsiung County]]/[[Kaohsiung City]] (now merged as Kaohsiung), and [[Pingtung County]]) and parts of [[Taitung County]] and [[Nantou County]] were flooded by record-breaking heavy rain. The rainfall in [[Pingtung County]] reached 2,327 millimeters (91.6&nbsp;in),<ref>{{cite web|url=http://wmo.asu.edu/Taiwan-rainfall-record-investigation|author=Arizona State University|title=Taiwan Rainfall Record Investigation|date=2009-08-12|access-date=2011-03-06|url-status=dead|archive-url=https://web.archive.org/web/20110102193453/http://wmo.asu.edu/Taiwan-rainfall-record-investigation|archive-date=2011-01-02}}</ref> breaking all rainfall records of any single place in Taiwan induced by a single typhoon,<ref>{{cite news|url=http://www.chinapost.com.tw/taiwan/national/national-news/2009/08/09/219677/RECORD-RAINS.htm|title=Record rains in south|publisher=The China Post|access-date=2009-08-09|date=2009-08-09|url-status=dead|archive-url=https://web.archive.org/web/20090812031824/http://chinapost.com.tw/taiwan/national/national-news/2009/08/09/219677/Record-rains.htm|archive-date=2009-08-12}}</ref> and making the cyclone the wettest known typhoon.


==See also==
== See also ==
{{Portal|Tropical cyclones}}
{{Portal|Tropical cyclones}}
* [[Pacific typhoon season]]
*[[China tropical cyclone rainfall climatology]]
* [[Tropical cyclones in {{CURRENTYEAR}}]]
*[[Effects of tropical cyclones]]
* [[{{CURRENTYEAR}} Pacific typhoon season]]
*[[Tropical cyclone]]
*[[Typhoons in the Philippines]]
* [[Effects of tropical cyclones]]
* [[China tropical cyclone rainfall climatology]]
For storms that have affected countries in this basin:
* [[Tropical cyclones in Malaysia]]
* [[Tropical cyclones in Vietnam]]
* [[Typhoons in the Korean peninsula]]
* [[Typhoons in the Philippines]]
* [[Typhoons in Japan]]


==References==
== References ==
{{Reflist|2}}
{{reflist}}


==External links==
== External links ==
{{WPAC EL's}}
*[http://www.jma.go.jp/en/typh/ Japan Meteorological Agency]
*[http://www.typhoon.gov.cn/en/index.php?style1=0 China Meteorological Agency]
*[http://www.prh.noaa.gov/guam/cyclone.php National Weather Service Guam]
*[http://www.hko.gov.hk/contente.htm Hong Kong Observatory]
*[http://web.kma.go.kr/eng/weather/typoon/typhoon.jsp Korea Meteorological Administration]
*[http://www.pagasa.dost.gov.ph/ Philippine Atmospheric, Geophysical and Astronomical Services Administration]
*[http://www.cwb.gov.tw/V6e/typhoon/ty.htm Taiwan Central Weather Bureau]
*[http://typhoon.ws/ Taiwan Typhoon Information Center]
*[http://maritim.bmg.go.id/cyclones/ TCWC Jakarta]{{dead link|date=August 2011}}
*[http://www.tmd.go.th/en/storm_tracking.php Thai Meteorological Department]
*[http://www.nchmf.gov.vn/web/en-US/43/Default.aspx Vietnam's National Hydro-Meterological Service]
*[http://www.usno.navy.mil/JTWC Joint Typhoon Warning Center]


{{Good article}}
{{Good article}}
{{Cyclones}}
{{Authority control}}


{{DEFAULTSORT:Pacific Typhoon}}
{{DEFAULTSORT:Pacific Typhoon}}
[[Category:Weather]]
[[Category:Tropical cyclone meteorology]]
[[Category:Tropical cyclone meteorology]]
[[Category:Pacific typhoons| ]]
[[Category:Typhoons| ]]
[[Category:Chinese words and phrases]]
[[Category:Arabic words and phrases]]

[[ar:إعصار التايفون]]
[[az:Tayfun qasırğası]]
[[cy:Teiffŵn]]
[[de:Taifun]]
[[eo:Tajfuno]]
[[fr:Cyclone tropical]]
[[hak:Thòi-fûng]]
[[ko:태풍]]
[[ka:ტაიფუნი (ციკლონი)]]
[[mk:Тајфун]]
[[ja:台風]]
[[pl:Tajfun]]
[[pt:tufão]]
[[ru:Тайфун]]
[[sk:Tajfún]]
[[sv:Tyfon]]
[[th:พายุไต้ฝุ่น]]
[[tr:Tayfun]]
[[wuu:台风]]
[[zh-yue:颱風]]
[[zh:颱風]]

Latest revision as of 15:16, 30 December 2024

Satellite image of Typhoon Mangkhut
Three different tropical cyclones active over the Western Pacific Ocean on August 7, 2006 (Maria, Bopha, and Saomai). The cyclones on the lower and upper right are typhoons.

A typhoon is a tropical cyclone that develops between 180° and 100°E in the Northern Hemisphere and which produces sustained hurricane-force winds of at least 119 km/h (74 mph).[1] This region is referred to as the Northwestern Pacific Basin,[2] accounting for almost one third of the world's tropical cyclones. The term hurricane refers to a tropical cyclone (again with sustained winds of at least 119 km/h (74 mph)) in the north central and northeast Pacific, and the north Atlantic.[3] In all of the preceding regions, weaker tropical cyclones are called tropical storms. For organizational purposes, the northern Pacific Ocean is divided into three regions: the eastern (North America to 140°W), central (140°W to 180°), and western (180° to 100°E). The Regional Specialized Meteorological Center (RSMC) for tropical cyclone forecasts is in Japan, with other tropical cyclone warning centres for the northwest Pacific in Hawaii (the Joint Typhoon Warning Center), the Philippines, and Hong Kong. Although the RSMC names each system, the main name list itself is coordinated among 18 countries that have territories threatened by typhoons each year.[4]

Within most of the northwestern Pacific, there are no official typhoon seasons as tropical cyclones form throughout the year. Like any tropical cyclone, there are several main requirements for typhoon formation and development. It must be in sufficiently warm sea surface temperatures, atmospheric instability, high humidity in the lower-to-middle levels of the troposphere, have enough Coriolis effect to develop a low pressure centre, a pre-existing low level focus or disturbance, and a low vertical wind shear. Although the majority of storms form between June and November, a few storms may occur between December and May (although tropical cyclone formation is very rare during that time). On average, the northwestern Pacific features the most numerous and intense tropical cyclones globally. Like other basins, they are steered by the subtropical ridge towards the west or northwest, with some systems recurving near and east of Japan. The Philippines receive the brunt of the landfalls, with China and Japan being less often impacted. However, some of the deadliest typhoons in history have struck China. Southern China has the longest record of typhoon impacts for the region, with a thousand-year sample via documents within their archives. Taiwan has received the wettest known typhoon on record for the northwest Pacific tropical cyclone basins. However, Vietnam recognises its typhoon season as lasting from the beginning of June through to the end of November, with an average of four to six typhoons hitting the country annually.[5][6]

According to the statistics of the Joint Typhoon Warning Center, from 1950 to 2022, the Northwest Pacific generated an average of 26.5 named tropical cyclones each year, of which an average of 16.6 reached typhoon standard or above as defined by the Joint Typhoon Warning Center.[7]

Nomenclature

[edit]

Etymology

[edit]

The etymology of typhoon is either Chinese or Persian-Hindustani origin.

Typhoon may trace to 風癡 (meaning "winds which long last"), first attested in 1124 in China. It was pronounced as [hɔŋ tsʰi] in Min Chinese at the time, but later evolved to [hɔŋ tʰai]. New characters 風颱 were created to match the sound, no later than 1566.[8][9] The word was introduced to Mandarin Chinese in the inverted Mandarin order 颱風 [tʰaɪ fɤŋ], later picked up by foreign sailors to appear as typhoon.[8] The usage of 颱風 was not dominant until Chu Coching, the head of meteorology of the national academy from 1929 to 1936, declared it to be the standard term.[10][11] There were 29 alternative terms for typhoon recorded in a chronicle in 1762, now mostly replaced by 颱風,[12] although 風癡 or 風颱 continues to be used in Min Chinese- and Wu Chinese- speaking areas from Chaozhou, Guangdong to Taizhou, Zhejiang.[8]

Some English linguists proposed the English word typhoon traced to the Cantonese pronunciation of 颱風 [tʰɔi fuŋ] (correspond to Mandarin [tʰaɪ fɤŋ]), in turn the Cantonese word traced to Arabic.[13] This claim contradicts the fact that the Cantonese term for typhoon was 風舊 [fuŋ kɐu] before the national promotion of 颱風.[8] 風舊 (meaning "winds which long last") was first attested in 280, being the oldest Chinese term for typhoon.[9] Not one Chinese historical record links 颱風 to an Arabic or foreign origin.[10][11] On the other hand, Chinese records consistently assert foreigners refer typhoon as "black wind".[10][11] "Black wind" eventually enters the vocabulary of Jin Chinese as 黑老風 [xəʔ lo fəŋ].[14]

Alternatively, some dictionaries propose that typhoon derived from (طوفان) tūfān, meaning storm in Persian and Hindustani.[15][16] The root of (طوفان) tūfān possibly traces to the Ancient Greek mythological creature Typhôn.[16] In French typhon was attested as storm in 1504.[17] Portuguese traveler Fernão Mendes Pinto referred to a tufão in his memoir published in 1614.[18] The earliest form in English was "touffon" (1588),[16] later as touffon, tuffon, tufon, tuffin, tuffoon, tayfun, tiffoon, typhawn.[10][11]

Intensity classifications

[edit]
RSMC Tokyo's Tropical Cyclone Intensity Scale
Category Sustained winds
Violent typhoon ≥105 knots
≥194 km/h
Very strong typhoon 85–104 knots
157–193 km/h
Typhoon 64–84 knots
118–156 km/h
Severe tropical storm 48–63 knots
89–117 km/h
Tropical storm 34–47 knots
62–88 km/h
Tropical depression ≤33 knots
≤61 km/h

A tropical depression is the lowest category that the Japan Meteorological Agency uses and is the term used for a tropical system that has wind speeds not exceeding 33 knots (38 mph; 61 km/h).[19] A tropical depression is upgraded to a tropical storm should its sustained wind speeds exceed 34 knots (39 mph; 63 km/h). Tropical storms also receive official names from RSMC Tokyo.[19] Should the storm intensify further and reach sustained wind speeds of 48 knots (55 mph; 89 km/h) then it will be classified as a severe tropical storm.[19] Once the system's maximum sustained winds reach wind speeds of 64 knots (74 mph; 119 km/h), the JMA will designate the tropical cyclone as a typhoon—the highest category on its scale.[19]

Since 2009 the Hong Kong Observatory has divided typhoons into three different classifications: typhoon, severe typhoon and super typhoon.[20] A typhoon has wind speed of 64–79 knots (73–91 mph; 118–149 km/h), a severe typhoon has winds of at least 80 knots (92 mph; 150 km/h), and a super typhoon has winds of at least 100 knots (120 mph; 190 km/h).[20] The United States' Joint Typhoon Warning Center (JTWC) unofficially classifies typhoons with wind speeds of at least 130 knots (67 m/s; 150 mph; 241 km/h)—the equivalent of a strong Category 4 storm in the Saffir-Simpson scale—as super typhoons.[21] However, the maximum sustained wind speed measurements that the JTWC uses are based on a 1-minute averaging period, akin to the U.S.'s National Hurricane Center and Central Pacific Hurricane Center. As a result, the JTWC's wind reports are higher than JMA's measurements, as the latter is based on a 10-minute averaging interval.[22]

Genesis

[edit]
Depth of 26 °C isotherm on October 1, 2006

There are six main requirements for tropical cyclogenesis: sufficiently warm sea surface temperatures, atmospheric instability, high humidity in the lower to middle levels of the troposphere, enough Coriolis force to develop a low pressure center, a pre-existing low level focus or disturbance, and low vertical wind shear. While these conditions are necessary for tropical cyclone formation, they do not guarantee that a tropical cyclone will form. Normally, an ocean temperature of 26.5 °C (79.7 °F) spanning through a depth of at least 50 metres (160 ft) is considered the minimum to maintain the special mesocyclone that is the tropical cyclone. These warm waters are needed to maintain the warm core that fuels tropical systems. A minimum distance of 500 km (300 mi) from the equator is normally needed for tropical cyclogenesis.[23] Whether it be a depression in the Intertropical Convergence Zone (ITCZ) or monsoon trough, a broad surface front, or an outflow boundary, a low level feature with sufficient vorticity and convergence is required to begin tropical cyclogenesis. About 85 to 90 percent of Pacific typhoons form within the monsoon trough.[24] Even with perfect upper-level conditions and the required atmospheric instability, the lack of a surface focus will prevent the development of organized convection and a surface low. Vertical wind shear of less than 10 m/s (20 kn, 33 ft/s) between the ocean surface and the tropopause is required for tropical cyclone development.[23][25] Typically with Pacific typhoons, there are two jets of outflow: one to the north ahead of an upper trough in the westerlies, and a second towards the equator.[24]

In general, the westerly wind increases associated with the Madden–Julian oscillation lead to increased tropical cyclogenesis in all tropical cyclone basins. As the oscillation propagates from west to east, it leads to an eastward march in tropical cyclogenesis with time during that hemisphere's summer season.[26] On average, twice per year twin tropical cyclones will form in the western Pacific Ocean, near the 5th parallel north and the 5th parallel south, along the same meridian, or line of longitude.[27] There is an inverse relationship between tropical cyclone activity in the western Pacific basin and the North Atlantic basin, however. When one basin is active, the other is normally quiet, and vice versa. The main reason for this appears to be the phase of the Madden–Julian oscillation, or MJO, which is normally in opposite modes between the two basins at any given time.[28]

Frequency

[edit]
Storm Frequency
Tropical storms and Typhoons by month,
for the period 1959–2015 (Northwest Pacific)
Month Count Average
Jan 28 0.5
Feb 14 0.2
Mar 26 0.5
Apr 37 0.6
May 66 1.2
Jun 100 1.8
Jul 221 3.9
Aug 310 5.4
Sep 280 4.9
Oct 228 4.0
Nov 139 2.4
Dec 69 1.2
Annual 1518 26.6
Source: JTWC[29]

Nearly one-third of the world's tropical cyclones form within the western Pacific. This makes this basin the most active on Earth.[30] Pacific typhoons have formed year-round, with peak months from August to October. The peak months correspond to that of the Atlantic hurricane seasons. Along with a high storm frequency, this basin also features the most globally intense storms on record. One of the most recent busy seasons was 2013. Tropical cyclones form in any month of the year across the northwest Pacific Ocean and concentrate around June and November in the northern Indian Ocean. The area just northeast of the Philippines is the most active place on Earth for tropical cyclones to exist.

Across the Philippines themselves, activity reaches a minimum in February, before increasing steadily through June and spiking from July through October, with September being the most active month for tropical cyclones across the archipelago. Activity falls off significantly in November, although Typhoon Haiyan, the strongest Philippine typhoon on record, was a November typhoon.[31] The most frequently impacted areas of the Philippines by tropical cyclones are northern and central Luzon and eastern Visayas.[32] A ten-year average of satellite determined precipitation showed that at least 30 percent of the annual rainfall in the northern Philippines could be traced to tropical cyclones, while the southern islands receive less than 10 percent of their annual rainfall from tropical cyclones.[33] The genesis and intensity of typhoons are also modulated by slow variation of the sea surface temperature and circulation features following a near-10-year frequency.[34]

Paths

[edit]
Tracks of all tropical cyclones in the northernwestern Pacific Ocean between 1980 and 2005. The vertical line to the right is the International Date Line.

Most tropical cyclones form on the side of the subtropical ridge closer to the equator, then move poleward past the ridge axis before recurving north and northeast into the main belt of the westerlies.[35] Most typhoons form in a region in the northwest Pacific known as typhoon alley, where the planet's most powerful tropical cyclones most frequently develop.[36] When the subtropical ridge shifts due to El Niño, so will the preferred tropical cyclone tracks. Areas west of Japan and Korea tend to experience many fewer September–November tropical cyclone impacts during El Niño and neutral years. During El Niño years, the break in the subtropical ridge tends to lie near 130°E, which would favor the Japanese archipelago.[37] During La Niña years, the formation of tropical cyclones, and the subtropical ridge position, shift westward across the western Pacific Ocean, which increases the landfall threat to China and greater intensity to Philippines.[37] Those that form near the Marshall Islands find their way to Jeju Island, Korea.[38] Typhoon paths follow three general directions.[30]

  • Straight track (or straight runner). A general westward path affects the Philippines, southern China, Taiwan, and Vietnam.
  • A parabolic recurving track. Storms recurving affect the eastern Philippines, eastern China, Taiwan, Korea, Japan, and the Russian Far East.
  • Northward track. From point of origin, the storm follows a northerly direction, only affecting small islands.

A rare few storms, like Hurricane John, were redesignated as typhoons as they originated in the Eastern/Central Pacific and moved into the western Pacific.

Basin monitoring

[edit]

Within the Western Pacific, RSMC Tokyo-Typhoon Center, part of the Japan Meteorological Agency, has had the official warning responsibility for the whole of the Western Pacific since 1989,[39] and the naming responsibility for systems of tropical storm strength or greater since 2000.[20] However each National Meteorological and Hydrological Service within the western Pacific has the responsibility for issuing warnings for land areas about tropical cyclones affecting their country, such as the Joint Typhoon Warning Center for United States agencies,[40] the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) for interests in the island archipelago nation,[41] and the Hong Kong Observatory for storms that come close enough to cause the issuance of warning signals.[42]

Name sources and name list

[edit]

The list of names consists of entries from 14 southeast and east Asian nations and regions and the United States who have territories directly affected by typhoons. The submitted names are arranged into a list, the names on the list will be used from up to down, from left to right. When all names on the list are used, it will start again from the left-top corner. When a typhoon causes damage in a region, the affected region can request for retiring the name in the next session of the ESCAP/WMO Typhoon Committee. A new name will be decided by the region whose name was retired.

Unlike tropical cyclones in other parts of the world, typhoons are not named after people. Instead, they generally refer to animals, flowers, astrological signs, and a few personal names. However, Philippines (PAGASA) retains its own naming list, which consists of both human names and other objects.[43] Japan and some other East Asian countries also assign numbers to typhoons.[44]

Storms that cross the date line from the central Pacific retain their original name, but the designation of hurricane becomes typhoon.

List of Western Pacific tropical cyclone names (as of 2024)
List Contributing nations/regions
 Cambodia  China  North Korea  Hong Kong, China  Japan  Laos  Macau, China  Malaysia  Federated States of Micronesia  Philippines  South Korea  Thailand  United States  Vietnam
1 Damrey Haikui Kirogi Yun-yeung Koinu Bolaven Sanba Jelawat Ewiniar Maliksi Gaemi Prapiroon Maria Son-Tinh
Ampil Wukong Jongdari Shanshan Yagi Leepi Bebinca Pulasan Soulik Cimaron Jebi Krathon Barijat Trami
2 Kong-rey Yinxing Toraji Man-yi Usagi Pabuk Wutip Sepat Mun Danas Nari Wipha Francisco Co-may
Krosa Bailu Podul Lingling Kajiki Nongfa Peipah Tapah Mitag Ragasa Neoguri Bualoi Matmo Halong
3 Nakri Fengshen Kalmaegi Fung-wong Koto Nokaen Penha Nuri Sinlaku Hagupit Jangmi Mekkhala Higos Bavi
Maysak Haishen Noul Dolphin Kujira Chan-hom Peilou Nangka Saudel Narra Gaenari Atsani Etau Bang-Lang
4 Krovanh Dujuan Surigae Choi-wan Koguma Champi In-fa Cempaka Nepartak Lupit Mirinae Nida Omais Luc-binh
Chanthu Dianmu Mindulle Lionrock Tokei Namtheun Malou Nyatoh Sarbul Amuyao Gosari Chaba Aere Songda
5 Trases Mulan Meari Tsing-ma Tokage Ong-mang Muifa Merbok Nanmadol Talas Hodu Kulap Roke Sonca
Nesat Haitang Jamjari Banyan Yamaneko Pakhar Sanvu Mawar Guchol Talim Doksuri Khanun Lan Saola
References:[45]

Records

[edit]
Total
storms
Year Tropical
storms
Typhoons Super
typhoons
39 1964 13 19 7
35 1965
1967
1971
14
15
11
10
16
16
11
4
4
34 1994 14 14 6
33 1996 12 15 6
32 1974 16 16 0
31 1989
1992
2013
10
13
18
15
17
8
6
5
5
30 1962
1966
1972
1990
2004
7
10
8
9
10
17
17
20
17
13
6
3
2
4
7

The most active Western Pacific typhoon season was in 1964,[citation needed] when 39 storms of tropical storm strength formed. Only 15 seasons had 30 or more storms developing since reliable records began. The least activity seen in the northwest Pacific Ocean was during the 2010 Pacific typhoon season, when only 14 tropical storms and seven typhoons formed. In the Philippines, the most active season since 1945 for tropical cyclone strikes was 1993, when nineteen tropical cyclones moved through the country.[46] There was only one tropical cyclone that moved through the Philippines in 1958. The 2004 Pacific typhoon season was the busiest for Okinawa since 1957.[47] Within Guangdong in southern China, during the past thousand years, the most active decades for typhoon strikes were the 1660s and 1670s.[48]

The highest reliably-estimated maximum sustained winds on record for a typhoon was that of Typhoon Haiyan at 314 km/h (195 mph) shortly before its landfall in the central Philippines on November 8, 2013.[49] The most intense storm based on minimum pressure was Typhoon Tip in the northwestern Pacific Ocean in 1979, which reached a minimum pressure of 870 hectopascals (26 inHg) and maximum sustained wind speeds of 165 knots (85 m/s, 190 mph, 310 km/h).[50] The deadliest typhoon of the 20th century was Typhoon Nina, which killed nearly 100,000 in China in 1975 due to a flood that caused 12 reservoirs to fail.[51] After Typhoon Morakot landed in Taiwan at midnight on August 8, 2009, almost the entire southern region of Taiwan (Chiayi County/Chiayi City, Tainan County/Tainan City (now merged as Tainan), Kaohsiung County/Kaohsiung City (now merged as Kaohsiung), and Pingtung County) and parts of Taitung County and Nantou County were flooded by record-breaking heavy rain. The rainfall in Pingtung County reached 2,327 millimeters (91.6 in),[52] breaking all rainfall records of any single place in Taiwan induced by a single typhoon,[53] and making the cyclone the wettest known typhoon.

See also

[edit]

For storms that have affected countries in this basin:

References

[edit]
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