Typhoon Mirinae (2009)

Typhoon Mirinae (Santi)
Typhoon (JMA scale)
Category 2 (Saffir–Simpson scale)

Typhoon Mirinae nearing landfall over the Philippines on October 30
Formed October 25, 2009
Dissipated November 3, 2009
Highest winds 10-minute sustained: 150 km/h (90 mph)
1-minute sustained: 165 km/h (105 mph)
Lowest pressure 955 hPa (mbar); 28.2 inHg
Fatalities 162 total
Damage $295 million (2009 USD)
Areas affected Mariana Islands, Philippines, Vietnam, Cambodia, Laos, Thailand
Part of the 2009 Pacific typhoon season

Typhoon Mirinae, known in the Philippines as Typhoon Santi, was the 34th depression and the 14th typhoon in the 2009 Pacific typhoon season. It came several weeks after Typhoons Ketsana and Parma devastated the Philippines, thus adding additional damage wrought by the two typhoons.

Meteorological history

Map plotting the track and intensity of the storm according to the Saffir–Simpson hurricane wind scale

Early on October 10, 2009, the Joint Typhoon Warning Center (JTWC) reported that an area of convection was developing over an elongated and broad low level circulation center within a monsoon trough about 500 km, 315 miles to the southeast of Pohnpei.[1] The low level circulation center was located under a region of favourable divergence, however it was located in area of moderate to high vertical windshear which was hampering the low level circulation centers attempts to organize.[1] Over the next couple of days the vertical windshear relaxed and as a result convection started to develop further with a Tropical Cyclone Formation Alert being issued by the JTWC late on October 25 after the Japan Meteorological Agency (JMA) had designated the disturbance as a weak tropical depression.[2] The JTWC then designated the depression as 23W early the next morning as there had been an increase in convection consolidating near a developing low level circulation center. The JTWC then reported later that day that the depression had intensified into a Tropical Storm, however the JMA did not follow suit until early the next day when they assigned the international name of Mirinae to the storm as it passed over the island of Rota in the Northern Mariana Islands. As Mirinae entered the Philippine Area of Responsibility on October 28, the PAGASA assigned Mirinae the local name "Santi", the nineteenth named storm of the Philippines. Mirinae intensified steadily, eventually becoming a Category 2 typhoon, with peak winds of 105 mph (165 km/h). Due to increasing wind shear and its fast movement, Mirinae didn't intensify further. At this time Mirinae turned to the south-west, which it tracked for several days until its landfall along the province of Quezon at the night of October 30, with Mirinae as a Category 2 typhoon. As it left the Philippines, Mirinae has weakened to a tropical storm, with winds of 65 mph. It trekked the South China Sea, with Mirinae not intensifying beyond tropical storm force due to increasing wind shear and decreasing sea surface temperatures, as well as cooler and more stable air along the area. It ultimately made landfall on Vietnam on November 2, as a Category 1 typhoon. Mirinae quickly dissipated inland the same day.

Preparations

Northern Mariana Islands

Hurricane Warning
Hurricane conditions
expected within 36 hours.
Hurricane Watch
Hurricane conditions
possible within 48 hours.
Tropical Storm Warning
Tropical storm conditions expected within 36 hours.
Tropical Storm Watch
Tropical storm conditions possible within 48 hours.

Early on October 26, the National Weather Service Weather Forecast Office in Tiyan, Guam placed Guam, Rota, Tinian and Saipan under a tropical storm watch which meant that tropical storm force winds were possible on the islands within 48 hours.[3] They then upgraded the watch for Rota, Tinian and Saipan to a Tropical Storm Warning as tropical storm force winds were now expected on the islands within 24 hours.[4] These warnings and watches were kept in force until they were cancelled early the next day after the tropical depression had moved away and intensified into a tropical storm.[5]

Philippines

Signal no. 3 was raised all over the parts of Southern Luzon, including Metro Manila, early in the morning of Friday even though the storm was far away. Ships that will travel were canceled as early as Friday for the preparation for the typhoon. Flights in and outside the Philippines were also canceled due to the typhoon. Signal no. 2 was raised across the Central Luzon and Bicol Region and Signal no. 1 was raised over northern Visayas and southern provinces of Northern Luzon. It had brought extreme winds in its passage.

Highest Public Storm Warning Signal

Highest PSWS raised as Santi passes Southern Luzon
Map PSWS# LUZON VISAYAS MINDANAO
 PSWS #3 Metro Manila, Bataan, Bulacan, Rizal, Cavite, Batangas, Laguna,
Quezon, Polilio Is, Camarines Provinces, Catanduanes, Marinduque, Mindoro Provinces, Lubang Is 		None None
PSWS #2 Zambales, Tarlac, Pampanga, Nueva Ecija, Aurora, Quirino, Romblon, Albay None None
PSWS #1 Pangasinan, La Union, Benguet, Nueva Vizcaya, Ifugao, Isabela, Sorsogon, Masbate Northern Samar None

Vietnam

The tropical storm roared toward Vietnam on November 1 after battering the Philippine capital and surrounding provinces, leaving 20 people dead in a region still soggy from three recent storms. Typhoon Mirinae weakened November 1 as it headed over the South China Sea. It was expected to strike Vietnam's central coast around noon November 2. Vietnamese Prime Minister, Nguyễn Tấn Dũng, ordered residents to begin evacuating high-risk areas of five coastal provinces and ordered Vietnamese fishermen in the South China Sea to seek shelter immediately. Along with the Philippines, Vietnam was still recovering from Typhoon Ketsana, which brought the Philippine capital, Manila, its worst flooding in 40 years and went on to kill more than 160 people in Vietnam in late September, 2009.

Impact

Philippines

Throughout the Philippines, Mirinae killed 39 people and left roughly $100.1 million in damage.[6]

Vietnam

Torrential rainfall produced by Mirinae in Vietnam triggered catastrophic flooding, killing at least 123 people. Roughly 2,400 homes were destroyed by swift currents and 437,300 hectares of crops were flooded. Damage was estimated to be at least 5 trillion dong ($280 million USD).[7]

See also

References

  1. 1 2 "Significant Tropical Weather Advisory for the Western and Southern Pacific 2009-10-23 06z". Joint Typhoon Warning Center. 2009-10-23. Retrieved 2009-10-30.
  2. ↑ "Tropical Cyclone Formation Alert 2009-10-25 21z". Joint Typhoon Warning Center. 2009-10-25. Retrieved 2009-10-30.
  3. ↑ Roger Edson, Michael Middlebrooke (2009-10-26). "Tropical Depression 23W Advisory Number One". National Weather Service in Tiyan, Guam. Archived from the original on October 26, 2009. Retrieved 2009-11-01.
  4. ↑ Roger Edson, Paul Stanko (2009-10-26). "Tropical Depression 23W Advisory Number Two". National Weather Service in Tiyan, Guam. Archived from the original on October 26, 2009. Retrieved 2009-11-01.
  5. ↑ Roger Edson, Clint Simpson (2009-10-27). "Tropical Depression 23W Advisory Number Five". National Weather Service in Tiyan, Guam. Archived from the original on October 27, 2009. Retrieved 2009-11-01.
  6. ↑ "Statistical Data On Destructive Tropical Cyclones 2009" (2010), National Disaster Coordinating Council
  7. ↑ "Typhoon Mirinae Kills 123 in Vietnam as Floods Sweep Homes Away". Bloomberg. November 8, 2009.
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