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Typhoon Megi, known in the Philippines as Typhoon Juan, was one of the most intense tropical cyclones on record. Megi, which means ''catfish'' in Korean (Hangul: 메기), was the only super typhoon in 2010. Early on October 18, Megi made its first landfall over Luzon. By passing Luzon, Megi weakened but gradually regained strength in the South China Sea, before weakening and losing its eyewall in the Taiwan Strait. Megi made its second landfall over Zhangpu in Fujian, China on October 23. Megi killed 31 people and caused $255.1 million (2010 USD) in damage over Luzon, making it one of the costliest typhoons in the Philippines. After moving to the South China Sea, the outflow of Megi and a weather front together brought torrential rainfall, caused $42.2 million (2010 USD) in damage and killed 38 people in Yilan, Taiwan, making Megi the deadliest typhoon of 2010 in Taiwan. Megi also caused $411.7 million (2010 USD) in damage over Fujian, China, although there was no death by the storm in the province. ==Meteorological history== Late on October 10, a tropical disturbance formed east-southeast of Guam.〔(【引用サイトリンク】url=http://www.nrlmry.navy.mil/tcdat/tc10/WPAC/15W.MEGI/trackfile.txt )〕 There were favorable environmental conditions, such as low vertical wind shear, good upper-level divergence and poleward outflow. The system began to significantly develop on October 12, prompting the Joint Typhoon Warning Center (JTWC) issuing a Tropical Cyclone Formation Alert at 09:00 UTC. Several hours later, the Japan Meteorological Agency (JMA) began monitoring the system as a tropical depression. Early on October 13, JTWC also classified the system as a tropical depression and designated it ''15W''. Hours later, well-defined convective banding features developed around the system and thunderstorm activity over the center of circulation increased. Sea surface temperature above and high oceanic heat content allowed for further strengthening. Situated to the southwest of a subtropical ridge, the system slowly tracked west-northwest towards the Philippines. Around 12:00 UTC, the system further intensified into a tropical storm, earning the name ''Megi'' from JMA. Late on October 13, Tropical Storm Megi became quasi-stationary, but a mid-latitude trough moving from the west caused the storm to resume a northwestward track around the periphery of the subtropical ridge. Throughout the morning of October 14, a central dense overcast developed over the center of Megi, allowing for intensification. Later that day, a microwave scanned the developing eye of Megi, resulting in JMA upgrading the system to a severe tropical storm and JTWC upgrading it to a typhoon. On October 15, JMA upgraded Megi to a typhoon, and the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) began to mention the typhoon and named it ''Juan'' as it entered the Philippine Area of Responsibility, with improved outflow over the western semi-circle and a well-defined low-level circulation center with tightly-curved banding. On October 16, Megi began rapid deepening with a well-defined eye due to enhanced poleward outflow by a transitory mid-latitude trough. Early on October 17, Megi started to moved westward and then west-southwestward because of the subtropical ridge. By the warm waters, impressive convection and a circular diameter eye, JTWC upgraded Megi to a super typhoon with category 5 strength on the Saffir–Simpson hurricane wind scale, becoming the only super typhoon in 2010 and the first since Nida in 2009. A hurricane hunter aircraft indicated 1-minute maximum sustained surface winds at and a mean sea level pressure of at 13:05 UTC. However, in postanalysis, the JTWC lowered the maximum intensity slightly, to . Late on October 17, Megi developed a well-defined diameter eye with a concentric eyewall and excellent radial outflow. According to RSMC Best Track Data, Megi attained the highest 10-minute maximum sustained winds at 125 knots (230 km/h, 145 mph) since Bess in 1982 and the lowest atmospheric pressure at since Vanessa in 1984 in the Northwest Pacific Ocean at 18:00 UTC and 00:00 UTC on the next day. Maintaining peak intensity, Typhoon Megi made landfall over Isabela, Philippines at 03:25 UTC (11:25 PST) on October 18.〔 When passing the Sierra Madre, the eye filled due to land interaction, but tightly curved banding and excellent radial outflow remained. The weakened typhoon arrived at the South China Sea late on October 18, and it began to reorganize. On October 19, Megi formed an enlarged but ragged eye. Late on the same day, Megi turned northwestward and moved slowly due to the significantly weakening western subtropical ridge in response to a deepening mid-latitude shortwave trough moving into Southeast China. Typhoon Megi turned northward then north-northeastward towards a break in the subtropical ridge caused by an approaching mid-latitude trough on October 20. By low vertical wind shear and good radial outflow especially on the poleward channel, the typhoon started to gradually intensify. On October 21, JMA reported that Megi attained its secondary peak intensity by the 10-minute maximum sustained winds reaching 95 knots (175 km/h, 110 mph) and the atmospheric pressure decreasing to , when the typhoon had a diameter round eye. On October 22, the eye of Typhoon Megi became cloud-filled and convection has begun erode due to increasing vertical wind shear. Late on the same day, JMA downgraded Megi to a severe tropical storm in the Taiwan Strait because of subsidence induced by a developing upper-level trough west of the storm. On October 23, Megi made landfall over Zhangpu in Fujian, China at 04:55 UTC.〔 Soon, Megi weakened to a tropical storm in mainland China, as the majority of convection associated with the system has dissipated, prompting JTWC issuing a final warning. Megi further weakened to a tropical depression late on October 23. On October 24, the tropical depression dissipated completely around 12:00 UTC, yet JTWC Best Track Data analyses that Megi became extratropical at 00:00 UTC. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Typhoon Megi (2010)」の詳細全文を読む スポンサード リンク
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