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Typhoon Dan, known in the Philippines as Typhoon Saling, was the third of a series of tropical cyclones that impacted the Philippines and Vietnam in October 1989. The storm developed on October 6, and tracked generally westward throughout its course. After crossing Luzon, the typhoon emerged into the South China Sea and reached its peak intensity, with sustained 10-minute winds of 140 km/h (85 mph), 1-minute winds of 130 km/h (80 mph), and a minimum barometric pressure of 960 millibars. The storm moved ashore in central Vietnam and dissipated after moving inland. The storm caused extensive damage throughout its course. In the Philippines, Dan left hundreds of thousands homeless and killed 58 people. Power outages were extensive in the Manila region. In Vietnam, the storm's high winds and heavy rains caused extensive damage and loss of life. More than 500,000 structures were damaged or destroyed and at least 43 people were killed across the country. ==Meteorological history== On October 6, 1989, a tropical disturbance formed in the monsoon trough near the island of Chuuk. An advisory by the Joint Typhoon Warning Center (JTWC) assessed the system as having a "poor" chance to develop due to strong wind shear in the region. A day later, the potential of development was adjusted to "fair". On October 8, the wind shear relented and a well-defined band persisted near the storm's center of circulation. As a result, a Tropical Cyclone Formation Alert was issued. That same day, the Japan Meteorological Agency (JMA) classified the storm as a tropical depression. At 1200 UTC, the JTWC issued their first warning on Tropical Depression 29W. At the time, it was centered about northeast of Yap.〔 About 18 hours later, the depression was upgraded to a tropical storm and given the name Dan. The cyclone moved westward at , and convection continued to mature. Outflow was good across most of the system, except the northwestern corner where it was restricted by interaction with a nearby typhoon.〔 Due to the cyclone's proximity to the Philippines, the Philippine Atmospheric, Geophysical and Astronomical Services Administration also monitored the storm, assigning it with the local name ''Saling''.〔 The JMA upgraded it to a tropical storm on October 9; both agencies recognized it as a typhoon the next day after an eye became visible and outflow improved in the northwestern quadrant.〔〔 Dan made landfall on the southeastern coast of Luzon in the Philippines, and its center tracked just south of the Ninoy Aquino International Airport.〔 Dan crossed over the island and emerged into the South China Sea, having lost its eye feature and weakened back into a tropical storm. Convection soon redeveloped as the storm moved northwestward through warm waters. The JTWC reports that Dan reattained typhoon status at 0000 UTC on October 12,〔 although it according to the JMA it did so 24 hours earlier.〔 The typhoon continued to intensify, and the JTWC estimates that it reached its peak intensity at 0600 UTC, with 1-minute maximum sustained winds of 130 km/h (80 mph).〔 The JMA indicates that Dan peaked slightly afterward, with 10-minute sustained winds of 140 km/h (85 mph) and a minimum barometric pressure reading of 960 millibars.〔 The storm passed about south of Hainan Island and weakened somewhat. Increased wind shear further deteriorated the system as it approached the coast of Vietnam. The storm moved inland at around 1200 UTC on October 13,〔 at which point the JMA downgraded it to a severe tropical storm and the JTWC issued their final advisory on the disturbance.〔〔 The circulation ultimately dissipated over the mountainous terrain and its remnants continued to move westward into Laos.〔 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 Dan (1989)」の詳細全文を読む スポンサード リンク
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