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Typhoon Roy, known in the Philippines as Typhoon Asiang, was the second-most intense January tropical cyclone on record in the Western Pacific basin. Forming out of an area of disturbed weather on January 7, 1988, Roy quickly intensified as it moved through the Marshall Islands. By January 9, the storm intensified into a typhoon and attained its peak intensity the following day. At its peak, sustained winds reached 215 km/h (135 mph).〔The JMA uses ten-minute sustained winds, while the JTWC uses one-minute sustained winds; the conversion factor between the two is 1.14x.〕 Slight weakening took place before the storm moved through the Mariana Islands. Continuing westward, the system eventually struck the Philippines as a minimal typhoon before dissipating over the South China Sea on January 19. Throughout its track, Typhoon Roy was responsible for two fatalities and $28.5 million (1988 USD) in losses, mainly in the Mariana Islands. Light to moderate structural damage took place across the Marshall Islands as the system moved through the region as a tropical storm. On January 12, the typhoon caused widespread damage to Guam and Rota as it brushed the two islands, destroying at least 200 homes. Due to the severity of damage wrought by the storm, the name ''Roy'' was retired following its usage and was replaced with the name ''Ryan''. ==Meteorological history== Typhoon Roy originated from an area of disturbed weather in early January 1988 in the central Pacific. Above average sea surface temperatures in the area allowed for gradual development as convection increased. By January 6, the JTWC began monitoring the disturbance for the possibility of it developing into a tropical cyclone; a mirror system was present in the Southern Hemisphere at the same time. The system south of the equator eventually developed into Tropical Cyclone Anne. By January 7, the Japan Meteorological Agency (JMA) classified the system as a tropical depression; shortly thereafter, the JTWC issued a Tropical Cyclone Formation Alert for the depression. Early on January 8, the JTWC issued their first advisory on Tropical Depression 08W, at which time the system was located near the Marshall Islands.〔 Tracking nearly due west, the depression was upgraded to Tropical Storm Roy six hours after the first advisory based on satellite data.〔 By this time, the JMA had already classified Roy as a tropical storm.〔 Continued deepening took place as the storm moved through the Marshall Islands; weather radar data from Kwajalein Atoll indicated the formation of an eye several hours after Roy was named; this was later supported by satellite information on January 9, at which time the storm was upgraded to a typhoon. Embedded within a moderate east-southeasterly flow along the south side of a subtropical ridge, the typhoon accelerated, obtaining a forward speed of .〔 During the afternoon of January 10, Roy reached its peak intensity as a low-range Category 4 equivalent typhoon on the Saffir–Simpson Hurricane Scale, attaining peak winds of 215 km/h (135 mph).〔 At the same time, the JMA estimated that the storm attained peak winds of 155 km/h (100 mph) along with a barometric pressure of 940 mbar (hPa; 27.76 inHg).〔 Upon reaching this strength, the storm was situated roughly east-southeast of Guam. Over the following few days, Roy gradually slowed and weakened as it neared the Mariana Islands. The storm made its closest approach to the islands early on January 12, passing within south of Rota. As the storm passed through the region, a new ridge built east of the typhoon, causing Roy to temporarily track southwestward before resuming a westward movement.〔 Moving along the southern edge of the ridge, Roy accelerated again as it headed towards the Philippines.〔 On January 14, the storm crossed 135°E, prompting the Philippine Atmospheric, Geophysical and Astronomical Services Administration to issue advisories on Roy, assigning it with the local name ''Asiang''.〔 As it neared the country, wind shear began to increase, resulting in further weakening. On January 16, Roy made landfall in the Bicol Region as a minimal typhoon before succumbing to shear and increased friction with the mountains of the Philippines. Later that day, the system weakened to a tropical storm before entering the South China Sea. The JTWC downgraded Roy to a tropical depression during the afternoon of January 17 and ceased issuing advisories early the next day.〔 However, the JMA continued to monitor Roy as a tropical storm until the morning of January 18 and declared the system dissipated early on January 19, at which time the depression was situated roughly 700 km (435 mi) east-northeast of Ho Chi Minh City, Vietnam.〔 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 Roy」の詳細全文を読む スポンサード リンク
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