Jump to content

Indian locomotive class WAG-12

From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by Anirudh Emani (talk | contribs) at 08:40, 14 July 2014 (→Meteorological history). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

This article is about the 2014 tropical cyclone. For other storms of the same name, see Typhoon Rammasun.
Rammasun (Glenda)
Current storm status
Category 1 typhoon (1-min mean)
Satellite image
Forecast map
As of:06:00 UTC, July 14
Location:12.9°N 129.1°E
About 583 nmi (1,080 km) E of Manila, Philippines
Sustained winds:60 (10-min mean)
65 (1-min mean)
gusting to 85
Pressure:980
Movement:W at 14 kn (26 km/h; 16 mph)
See more detailed information.

Typhoon Rammasun, known in the Philippines as Typhoon 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] After Lingling and Kaijiki, Rammasun became the third tropical cyclone, and the first typhoon to directly impact the Philippines in 2014. 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. Having passed through the islands of Micronesia, the system turned westwards and quickly progressed along it's path under the influence of a subtropical ridge (STR). Rammasun posed a significant threat to the Philippine island of Luzon, as it was expected to reach typhoon intensity before making landfall there.[3]

In preparation for the storm, Governor of Guam Eddie Calvo declared the island in Condition of Readiness 3[4] and later upgraded it to Condition of Readiness 1 before eventually issuing a tropical storm warning. On July 11, NASA satellites revealed Rammasun passing directly over Guam.[5] American National Weather Service stated that an unexpected rise in wind shear kept the system from intensifying much further before reaching Guam. Rammasun only made landfall on Guam as a tropical depression, with winds much weaker than earlier anticipated.[6] However, under the influence of the system, the island did receive a substantial amount of rainfall, making that day the wettest, in around 3 months. The United States territory received 25 to 50 mm (1 to 2 inches) of rain.[7]

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. [8] 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.[9][10] Later that day, the JTWC too classified the system a tropical depression, designating it with 09W.[11] That evening, the JMA confirmed 30 knot winds around the system.[12] 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.[13] 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.[14] 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.[15][16] 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.[17] Rammasun entered the Philippine area of responsibility and was given a local name, Glenda on July 13.[18] The storm maintained intensity while a burst of deep central convection developed and the LLCC became slightly more well defined.[19] Over the next couple of hours, vertical wind shear decreased gradually. Rammasun tracked in a westerly direction along the periphery of the steering subtropical ridge. Outflow improved along the southwestern quadrant[20] and Rammasun became a typhoon.[21]

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. ^ "Governor declares Condition of Readiness 3". Kuam. Retrieved 13 July 2014.
  5. ^ "NASA sees Tropical Storm 9 over Guam". Science Codex. Retrieved 13 July 2014.
  6. ^ "Guam dodging 09W was 'shear' luck". Guam PDM. Retrieved 13 July 2014.
  7. ^ "Rammasun to Strengthen, Threaten the Philippines". AccuWeather. Retrieved 13 July 2014.
  8. ^ "LOW from ABPW10 2014-07-09, 0600z". NOAA, NASA. Retrieved 12 July 2014.
  9. ^ "TCFA on Typhoon Rammasun". JTWC, NOAA. Retrieved 12 July 2014.
  10. ^ "JMA Classifies 09W a TD (<30kts)". JMA. Retrieved 12 July 2014.
  11. ^ "Prognostic Reasoning for JTWC Warning 001 on Typhoon Rammasun". JTWC. Retrieved 12 July 2014.
  12. ^ "JMA Confirms 30kt winds around Typhoon Rammasun". JMA. Retrieved 12 July 2014.
  13. ^ "JTWC Warning 003 for Typhoon Rammasun". JTWC. Retrieved 12 July 2014.
  14. ^ "JTWC Warning 006 on Typhoon Rammasun". JTWC. Retrieved 12 July 2014.
  15. ^ "JMA - Tropical Cyclone Advisory as on 120600". JMA. Retrieved 12 July 2014.
  16. ^ "Tropical Depression 09W to Become Next Typhoon". AccuWeather. Retrieved 12 July 2014.
  17. ^ "Prognostic Reasoning for Warning 009 on Typhoon Rammasun". JTWC. Retrieved 12 July 2014.
  18. ^ "SEVERE WEATHER BULLETIN NUMBER ONE". PAGASA. Issued at 7:00 p.m., Sunday, 13 July 2014. Retrieved 13 July 2014. {{cite web}}: Check date values in: |year= (help)CS1 maint: year (link)
  19. ^ "Prognostic Reasoning for Warning 13 on Typhoon Rammasun". JTWC. Retrieved 14 July 2014.
  20. ^ "Prognostic Reasoning for Warning 15 on Typhoon Rammasun". JTWC. Retrieved 14 July 2014.
  21. ^ "JMA Advisory WTPQ21 RJTD 140000". JMA. Retrieved 14 July 2014.
Wikimedia Commons has media related to Indian locomotive class WAG-12.


Retrieved from "https://en.wikipedia.org/enwiki/w/index.php?title=Indian_locomotive_class_WAG-12&oldid=616886919"