Tropical Storm Haitang (2011) Explained

Tropical Storm Haitang
Formed:September 24, 2011
Dissipated:September 27, 2011
Winds:35
Pressure:996
Basin:wpac
Winds:35
Pressure:996
Fatalities:7
Missing:4
Year:2011
Currency:USD
Damage:Unknown
Areas:China, Southeast Asia
Season:2011 Pacific typhoon season

Tropical Storm Haitang was a weak tropical cyclone which impacted China and Southeast Asia. The nineteenth named storm of the below-average 2011 Pacific typhoon season, Haitang developed from a disturbance in the South China Sea. After being recognized as a tropical depression on September 24, Haitang would peak as a minimal tropical storm before making landfall in Hue, Vietnam. Haitang would rapidly weaken once inland, dissipating in Laos in September 27.

Meteorological history

At 15:00 UTC on September 21, the Joint Typhoon Warning Center (JTWC) began to monitor a low-pressure area persisting around 260 nautical miles south of Hong Kong.[1] As the next three days progressed, the disturbance meandered northwards, strengthening slightly. On September 24, the Japan Meteorological Agency (JMA) would recognize the disturbance as a tropical depression east of Vietnam.[2] Later that day, the JTWC would issue a Tropical Cyclone Formation Alert, stating that the low could develop into a tropical cyclone.[3] A few hours later, the JTWC would issue its first advisory on the system, designating it as Tropical Depression 21W.[4]

The next day, the JMA would upgrade the nascent depression to a tropical storm, naming it Haitang.[5] Later that day, the storm became better organized; however, its low-level circulation center (LLCC) would become fully exposed due to moderate vertical wind shear from nearby Typhoon Nesat, which prevented further strengthening.[6] Haitang would significantly slow down, meandering towards Vietnam at a speed of .[7] However, in the night of September 26, Haitang would rapidly accelerate westwards, later making landfall near Hue, Vietnam.[8] Despite some bursts of convection, both land interaction and vertical wind shear would cause the system to weaken into a tropical depression, resulting in the JTWC issuing its last advisory on Haitang at 21:00 UTC that day.[9] The JMA would still track Haitang until it degenerated into a remnant low in Vietnam early on September 27.[10]

Preparations and impacts

Vietnam

The national carrier of Vietnam, Vietnam Airlines, would cancel 36 flights throughout September 26–27 due to the threat posed by the cyclone.[11] As Haitang impacted Vietnam, it would cause flash flooding throughout the nation's central provinces.[12] Waters in the Kiến Giang, Bo, and Huong rivers rose to record levels and in Hue City, low-lying areas were inundated, resulting in the city's residents using boats for transport.[13] Haitang would cause seven fatalities, all in Vietnam, and cause four others to be missing as well.[14] Haitang would damage 128 homes, also flooding around 5000 hectares of crops.[15]

Thailand

In Thailand, the remnants of Haitang would produce torrential rains throughout most of the nation, contributing to the 2011 Thailand floods.[16] [17] The Thai Meteorological Department would advise people to refrain from going out to sea.

See also

Notes and References

  1. Web site: Joint Typhoon Warning Center . JTWC — Tropical Cyclone Warning 211500 – Tropical Storm Nesat and Tropical Depression 31 . dead . https://archive.today/20240522225853/https://www.webcitation.org/61um6AUnm?url=http://gwydir.demon.co.uk/advisories/ABPW10-PGTW_201109211500.htm . May 22, 2024 . September 24, 2011.
  2. Web site: JMA — Tropical Cyclone Warning 240000 – Tropical Depressions 31 . live . https://web.archive.org/web/20010502184435/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt . May 2, 2001 . September 24, 2011 . Japan Meteorological Agency.
  3. Web site: Joint Typhoon Warning Center . JTWC — Tropical Cyclone Formation Alert — Tropical Depression 31 . dead . https://web.archive.org/web/20010430145016/http://weather.noaa.gov/pub/data/raw/wt/wtpn21.pgtw..txt . April 30, 2001 . September 24, 2011.
  4. Web site: Joint Typhoon Warning Center . JTWC — Tropical Cyclone Advisory 01 – Tropical Storm Haitang . live . https://web.archive.org/web/20010430085744/http://weather.noaa.gov/pub/data/raw/wt/wtpn32.pgtw..txt . April 30, 2001 . September 29, 2011.
  5. Web site: JMA — Tropical Cyclone Advisory 250000 – Tropical Storm Haitang . dead . https://archive.today/20240522225933/https://www.webcitation.org/61xQOZFi0?url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201109250000.htm . May 22, 2024 . September 29, 2011 . Japan Meteorological Agency.
  6. Web site: Joint Typhoon Warning Center . JTWC — Tropical Cyclone Advisory 04 – Tropical Storm Haitang . dead . https://archive.today/20240522173031/https://www.webcitation.org/61yyCLNO6?url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109250900.htm . May 22, 2024 . September 29, 2011.
  7. Web site: Joint Typhoon Warning Center . JTWC — Tropical Cyclone Advisory 06 – Tropical Storm Haitang . dead . https://archive.today/20240522230013/https://www.webcitation.org/61yyCEY8X?url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109252100.htm . May 22, 2024 . September 29, 2011.
  8. 2011 West Pacific TCR . . 36.
  9. Web site: Joint Typhoon Warning Center . JTWC — Tropical Cyclone Advisory 10 – Tropical Storm Haitang . dead . https://archive.today/20240522230056/https://www.webcitation.org/61zsTQrTp?url=http://gwydir.demon.co.uk/advisories/WTPN32-PGTW_201109262100.htm . May 22, 2024 . September 29, 2011.
  10. Web site: JMA — Tropical Cyclone Advisory 270600 – Tropical Storm Haitang . dead . https://archive.today/20240522230135/https://www.webcitation.org/621yPMXRS?url=http://gwydir.demon.co.uk/advisories/WTPQ21-RJTD_201109270600.htm . May 22, 2024 . September 29, 2011 . Japan Meteorological Agency.
  11. News: September 26, 2011 . PRESS DIGEST - Vietnam newspapers - Sept 27 . . December 23, 2023.
  12. Web site: Tropical Cyclones bring Heavy Rains to the Far East NASA Global Precipitation Measurement Mission . 2023-12-23 . gpm.nasa.gov.
  13. Web site: 2011-09-27 . Tropical storm Haitang slams central Vietnam . 2023-12-22 . Borneo Post Online . en-US.
  14. Web site: TROPICAL CYCLONES IN 2011 . 2023-12-22 . www.hko.gov.hk . en.
  15. September 29, 2011 . Typhoon Nesat to strike central region tomorrow . Vietnamese Government . ReliefWeb.
  16. Web site: Thailand flood its most expensive in history; Western Caribbean disturbance develops Category 6™ . 2023-12-23 . Weather Underground.
  17. Web site: Mail . Pattaya . 2011-09-28 . Northeast, East and South to brace for Storm Haitang . 2023-12-23 . Pattaya Mail . en-US.

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