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Typhoon Bilis (2000)
Typhoon Bilis, known in the Philippines as Typhoon Isang, was the strongest tropical cyclone in the western Pacific during 2000 and wrought considerable damage in Taiwan and China in August of that year. The tenth named storm of the season, Bilis originated from an area of disturbed weather that developed into a tropical depression southeast of Guam on August 18. Situated within an environment highly conductive for continued tropical development, the depression intensified into a tropical storm a day after formation; Bilis was upgraded to typhoon status on August 20 as it maintained a northwest course. Without significant inhibiting factors, the typhoon reached peak intensity with maximum sustained winds of 205 km/h (125 mph) and a minimum barometric pressure of 920 mbar (hPa; 27.17 inHg). At the same intensity Bilis made landfall on Taiwan the following day. Despite its short stint over land, Bilis was greatly weakened, and made a brief track over the Taiwan Strait before its final landfall on China's Fujian Province early the next day. Moving inland into Mainland China, Bilis quickly weakened, and was only a tropical depression later that day; the depression diffused into a remnant low on August 25. These remnants tracked northeast across the Yellow Sea before dissipating in the Korean Peninsula on August 27.
==Meteorological history==
The predecessor to Typhoon Bilis began as a developing area of disturbed weather well south-southeast of Guam on August 15. Satellite analysis revealed a broad low-pressure area associated with the developing convection. Within an area supportive of tropical cyclogenesis, the disturbance gradually organized and intensified. At 0600 UTC on August 17, the Joint Typhoon Warning Center (JTWC) began classifying the system as a tropical depression. The Japan Meteorological Agency (JMA) followed suit the following day at 1200 UTC. Tracking northwestward, the favorable conditions allowed the depression to quickly strengthen and attain tightly wrapped rainbands,〔 prompting the JMA to upgrade the system to tropical storm status at 0600 UTC on August 19,〔 thus designating the storm with the name ''Bilis''.
This period of rapid strengthening continued throughout the day's course, with the system reaching severe tropical storm intensity twelve hours after naming and then typhoon intensity at 1200 UTC on August 20.〔 Water vapor satellite imagery at the time indicated that Bilis maintained a well-organized outflow pattern. As a result of its rapid intensification, Bilis grew in size, exhibiting a behavior typical of tropical cyclones originating from the northwest Pacific monsoon trough. In addition, the typhoon developed an eye early on August 20, though in its initial stages the eye was irregular in shape.〔 At 1200 UTC on August 21, the JTWC determined Bilis to have reached super typhoon intensity..〔 Six hours later, the JMA indicated that the typhoon had reached its peak intensity with maximum sustained winds of 205 km/h (125 mph) and a minimum barometric pressure of 920 mbar (hPa; 27.17 inHg).〔 By this point Bilis' eye had become cloud-free and well defined. The typhoon maintained this intensity with little fluctuation for roughly the ensuing eighteen hours as it tracked northwest.〔 Early on August 22, microwave imagery indicated concentric eyewalls, a sign of a possible eyewall replacement cycle.〔
Still at peak intensity,〔 Bilis made landfall on the coast of southern Taiwan at 1400 UTC on August 22.〔 Concurrently, the storm's internal structure began to show signs of disruption, and its eye began to shrink. The typhoon accelerated over the island, and as such emerged into the Taiwan Strait no longer than five or six hours after landfall.〔 Despite the short stint over land, Bilis had greatly weakened, and was only a minimal typhoon upon its reentry over water.〔 However, there was a large discrepancy between JMA and JTWC intensity estimates, with the latter suggesting that Bilis had only weakened slightly.〔 Nonetheless, the typhoon made its final landfall Jinjiang, Fujian at 0300 UTC on August 24. This greatly weakened Bilis, and three hours later the JMA downgraded it as a tropical storm.〔 Shortly after landfall, the weakening tropical cyclone became quasi-stationary just inland of Mainland China. By this point convection was intermittent and short-lived,〔 and at 1200 UTC the JMA classified the system as a tropical depression.〔 Though the JTWC discontinued its monitoring activities,〔 the depression began to assume a northerly course on August 24. At 1200 UTC the next day, the depression was determined to have diffused into a remnant low while still inland. Bilis' remnants continued to track northeast, across the Yellow Sea, and dissipated on August 27 shortly after entering the Korean Peninsula.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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