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Indian locomotive class WAG-12

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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:15:00 UTC, July 12
Location:13.5°N 141.0°E
About 187 nmi (346 km; 215 mi) W of Andersen AFB, Guam
Sustained winds:35 (10-min mean)
35 (1-min mean)
gusting to 50
Pressure:1002
Movement:W at 16 kn (30 km/h; 18 mph)
See more detailed information.

Tropical Storm Rammasun is the ninth named storm of the annual typhoon season. It 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 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.[1] Upon entering the Phillipine Area of Responsibility, the storm will be given a local name, Glenda.

After Lingling and Kaijiki, Rammasun is the third tropical storm to pose a threat to Philippines in 2014.

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. [2] 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.[3][4] Later that day, the JTWC too classified the system a tropical depression, designating it with 09W.[5] That evening, the JMA confirmed 30 knot winds around the system.[6] 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.[7] 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.[8] The next morning, while 09W was passing very close to Guam, the JMA upgraded it to a tropical storm, thereby officially naming it Rammasun.[9][10] 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.[11]

See also

References

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