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| Hurricane season=[[2014 Pacific typhoon season]]
| Hurricane season=[[2014 Pacific typhoon season]]
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'''Tropical Storm Rammasun''', known in the Philippines as '''Tropical Storm Glenda''' is the ninth officially named storm of the [[2014 PTS|annual typhoon season]]. It is also the seventh storm of the season to be named by the [[Philippine Atmospheric, Geophysical and Astronomical Services Administration]] (PAGASA). Rammasun formed in the [[Intertropical Convergence Zone]], an area near the equator where the northeast and southeast [[trade wind]]s come together, and slowly drifted northwestwards. Having passed through Guam, the system now poses a significant threat to the [[Luzon]] island of [[Philippines]], as it is expected to reach typhoon intensity over the next 48-60 hours, before making landfall there.<ref>{{cite web|title=Typhoon Threat in the Philippines Next Week|url=http://www.weather.com/news/weather-hurricanes/tropical-storm-nine-guam-philippines-20140711|publisher=The Weather Channel|accessdate=12 July 2014}}</ref>
'''Tropical Storm Rammasun''', known in the Philippines as '''Tropical Storm Glenda''' is the ninth officially named storm of the [[2014 PTS|annual typhoon season]]. It is also the seventh storm of the season to be named by the [[Philippine Atmospheric, Geophysical and Astronomical Services Administration]] (PAGASA). Rammasun is a [[Thai language|Siamese]] word of [[List of thunder gods|thunder god]],<ref>{{cite web|title=Tropical depression near Guam may bring rain, wind|url=http://www.taipeitimes.com/News/taiwan/archives/2014/07/12/2003594929|publisher=Taipei Times|accessdate=13 July 2014}}</ref> while the word Glenda, a feminine given name means ''pure, clean'' or ''good'' in [[Welsh language|Welsh]].<ref>{{cite web|title=Behind the name: Glenda|url=http://www.behindthename.com/php/view.php?name=glenda|publisher=Behind The Name|accessdate=13 July 2014}}</ref> The storm formed in the [[Intertropical Convergence Zone]], an area near the equator where the northeast and southeast [[trade wind]]s come together, and slowly drifted northwestwards. Rammasun quickly tracked westwards, through the islands of [[Micronesia]] under the influence of a [[subtropical ridge]] (STR) and posed a significant threat to the [[Luzon]] island of [[Philippines]], as it was expected to reach typhoon intensity before making landfall there.<ref>{{cite web|title=Typhoon Threat in the Philippines Next Week|url=http://www.weather.com/news/weather-hurricanes/tropical-storm-nine-guam-philippines-20140711|publisher=The Weather Channel|accessdate=12 July 2014}}</ref>


After Lingling and Kaijiki, Rammasun is the third tropical storm to pose a threat to Philippines in 2014. Under the influence of the storm, Guam recieved a substantial amount of rainfall, making July 11 the wettest day in around 3 months. The [[United States territory]] received 25 to 50 mm (1 to 2 inches) of rain.<ref>{{cite web|title=Rammasun to Strengthen, Threaten the Philippines|url=http://www.accuweather.com/en/weather-news/rammasun-to-strengthen-1/30302492|publisher=AccuWeather|accessdate=13 July 2014}}</ref>
After Lingling and Kaijiki, Rammasun is the third tropical storm to pose a threat to Philippines in 2014. Under the influence of the storm, Guam recieved a substantial amount of rainfall, making July 11 the wettest day in around 3 months. The [[United States territory]] received 25 to 50 mm (1 to 2 inches) of rain.<ref>{{cite web|title=Rammasun to Strengthen, Threaten the Philippines|url=http://www.accuweather.com/en/weather-news/rammasun-to-strengthen-1/30302492|publisher=AccuWeather|accessdate=13 July 2014}}</ref>

Revision as of 12:22, 13 July 2014

This article is about the 2014 tropical cyclone. For other storms of the same name, see Typhoon Rammasun.
Rammasun
Current storm status
Tropical storm (1-min mean)
Satellite image
Forecast map
As of:06:00 UTC, July 13
Location:13.6°N 138.4°E
About 247 nmi (457 km) N of Yap
Sustained winds:35 (10-min mean)
35 (1-min mean)
gusting to 50
Pressure:1000
Movement:W at 16 kn (30 km/h; 18 mph)
See more detailed information.

Tropical Storm Rammasun, known in the Philippines as Tropical Storm Glenda is the ninth officially named storm of the annual typhoon season. It is also the seventh storm of the season to be named by the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA). Rammasun is a Siamese word of thunder god,[1] while the word Glenda, a feminine given name means pure, clean or good in Welsh.[2] The storm formed in the Intertropical Convergence Zone, an area near the equator where the northeast and southeast trade winds come together, and slowly drifted northwestwards. Rammasun quickly tracked westwards, through the islands of Micronesia under the influence of a subtropical ridge (STR) and posed a significant threat to the Luzon island of Philippines, as it was expected to reach typhoon intensity before making landfall there.[3]

After Lingling and Kaijiki, Rammasun is the third tropical storm to pose a threat to Philippines in 2014. Under the influence of the storm, Guam recieved a substantial amount of rainfall, making July 11 the wettest day in around 3 months. The United States territory received 25 to 50 mm (1 to 2 inches) of rain.[4]

Meteorological history

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

The origins of Tropical Storm Rammasun can be tracked back to a tropical disturbance formed to the east of Chuuk Lagoon, in the evening of July 8. Overnight, it slowly drifted northwestwards into a favorable environment. [5] Some 24 hours later, satellite imagery depicted a slowly consolidating low level circulation center (LLCC), with winds reaching 25 knots (46 km/h; 29 mph). The Joint Typhoon Warning Center (JTWC) issued a tropical cyclone formation alert (TCFA) on this system, while the Japan Meteorological Agency (JMA) classified it as a weak tropical depression.[6][7] Later that day, the JTWC too classified the system a tropical depression, designating it with 09W.[8] That evening, the JMA confirmed 30 knot winds around the system.[9] Early on July 11, the depression's LLCC deepened a little more as it entered an area of low vertical wind shear (VWS) and moderate-high sea surface temperature. This lead to the JTWC updrading 09W to a Tropical Storm.[10] However, the same night, the JTWC corrected their reports and downgraded the storm to a depression again, citing that dvorak estimates do not yet suggest that the system has tropical storm intensity.[11] The next morning, 09W's center passed very close to Guam. The storm brought heavy rainfall to the island. Around the same time, the JMA upgraded it to a tropical storm and assigned it the official international name Rammasun.[12][13] Tracking westward at over 15 knots (28 km/h; 17 mph), the system's convective banding became more persistent. Satellite imagery revealed weakly diffluent easterly outflow and low to moderate wind shear. The JTWC was once again reporting tropical storm force winds around the center.[14]

See also

References

  1. ^ "Tropical depression near Guam may bring rain, wind". Taipei Times. Retrieved 13 July 2014.
  2. ^ "Behind the name: Glenda". Behind The Name. Retrieved 13 July 2014.
  3. ^ "Typhoon Threat in the Philippines Next Week". The Weather Channel. Retrieved 12 July 2014.
  4. ^ "Rammasun to Strengthen, Threaten the Philippines". AccuWeather. Retrieved 13 July 2014.
  5. ^ "LOW from ABPW10 2014-07-09, 0600z". NOAA, NASA. Retrieved 12 July 2014.
  6. ^ "TCFA on Typhoon Rammasun". JTWC, NOAA. Retrieved 12 July 2014.
  7. ^ "JMA Classifies 09W a TD (<30kts)". JMA. Retrieved 12 July 2014.
  8. ^ "Prognostic Reasoning for JTWC Warning 001 on Typhoon Rammasun". JTWC. Retrieved 12 July 2014.
  9. ^ "JMA Confirms 30kt winds around Typhoon Rammasun". JMA. Retrieved 12 July 2014.
  10. ^ "JTWC Warning 003 for Typhoon Rammasun". JTWC. Retrieved 12 July 2014.
  11. ^ "JTWC Warning 006 on Typhoon Rammasun". JTWC. Retrieved 12 July 2014.
  12. ^ "JMA - Tropical Cyclone Advisory as on 120600". JMA. Retrieved 12 July 2014.
  13. ^ "Tropical Depression 09W to Become Next Typhoon". AccuWeather. Retrieved 12 July 2014.
  14. ^ "Prognostic Reasoning for Warning 009 on Typhoon Rammasun". JTWC. Retrieved 12 July 2014.
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