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Typhoon Prapiroon, known in the Philippines as Typhoon Lusing, was the costliest tropical cyclone to strike the Korean peninsula and the fourth costliest in the West Pacific on record. Prapiroon developed as a tropical depression on August 24, 2000, and took a primarily northerly course for much of its duration, though steering currents caused it to track westward for extended periods of time on two occasions. Intensification was gradual, and on August 26 the system reached tropical storm status, though the system's organization remained rather loose for much of its early developmental history. On August 29, Prapiroon swung near Taiwan and East China as it tracked about the western periphery of a nearby high pressure area. A day later, the storm reached typhoon intensity within the East China Sea, later attaining peak intensity as a typhoon of moderate strength within the Yellow Sea. On August 31, a slightly weakened Prapiroon made landfall on North Korea and quickly tracked across the Korean peninsula, before transitioning into an extratropical cyclone in the Sea of Japan on September 1; the system dissipated east of Hokkaido three days later. ==Meteorological history== Prapiroon originated from a disturbance that developed within the warm tropics southeast of Guam on August 22. Positioned in an area with low wind shear, atmospheric conditions around the system were supportive of tropical cyclone development. After some organization, the Japan Meteorological Agency (JMA) declared the area of disturbed weather to have assumed the characteristics of a tropical depression at 1800 UTC on August 24. Initially tracking westward,〔 the diffuse depression reached a temporary halt and later began to accelerate towards the north on August 25. Strengthening continued at a steady pace thereafter, and at 1800 UTC the following day, the JMA upgraded the depression to tropical storm status, based on corresponding ship reports and satellite intensity estimates, and named the system ''Prapiroon'' accordingly. Despite its classification, Prapiroon was loosely defined, as it lacked a primary circulation center and instead was centered around multiple vorticies.〔 In response to steering wind currents induced by a nearby, strengthening high pressure area, Prapiroon began to take a more westerly course beginning late on August 27.〔 Around the same time, the JMA upgraded the cyclone further to severe tropical status, a classification Prapiroon would maintain for much of its existence.〔 Despite a consolidation of the previously distinct low-level circulation vorticies, moderate wind shear displaced the newly merged center from much of its associated convection. However, the storm's overall structure would improve over the following days as Prapiroon began to curve northward around the western periphery of the nearby high pressure region. Late on August 29, Prapiroon made its closest approach to Taipei, Taiwan, at a distance of 260 km (160 mi). At around the same time, satellite imagery indicated the development of a large, albeit ragged eye.〔 Having resumed a northerly course, the recent strengthening trend prompted the JMA to classify Prapiroon as a typhoon at 0600 UTC on August 30. Roughly six hours later, the typhoon peaked in strength, with maximum sustained winds reaching 130 km/h (80 mph) and a barometric pressure bottoming out at 965 mbar (hPa; 28.50 inHg). This intensity was held for at least the following 18 hours before Prapiroon's cloud structure began to elongate as the storm accelerated into more northerly latitudes,〔〔 where wind shear was increased.〔 Prapiroon was downgraded back to severe tropical storm intensity shortly before it made landfall on the western coast of North Korea at 1300 UTC on August 31.〔 Although Prapiroon crossed the Korean peninsula at a rapid pace, upon emerging into the Sea of Japan early on September 1, its interaction of land had caused the majority of its convection to deteriorate.〔 At 1200 UTC that day, the JMA analyzed Prapiroon to have transitioned into an extratropical cyclone. These remnants tracked quickly eastward, crossing Japan on September 2 before dissipating in the open Pacific east of Hokkaido on September 4.〔 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 Prapiroon (2000)」の詳細全文を読む スポンサード リンク
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