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Typhoon Nepartak (2003)
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Typhoon Nepartak (2003) : ウィキペディア英語版
Typhoon Nepartak (2003)

Typhoon Nepartak, known in the Philippines as Typhoon Weng, was a modest tropical cyclone that struck the central Philippines and the southern China island of Hainan in November 2003. Forming as a tropical depression on November 11 between Yap and Guam, the system moved westward and slowly intensified. It received the name Nepartak midday on November 12 from the Japan Meteorological Agency, becoming the 20th named storm of the 2003 Pacific typhoon season. On November 13, Napartak struck Samar in the Philippines and bisected the island chain. Up to four million people lost power, and transportation ground to a halt; over 5,000 individuals became stranded on ships forced to stay in port during the tropical storm. It was reported that 13 individuals lost their lives to the storm in the Philippines.
After entering the open waters of the South China Sea, Nepartak continued to intensify and turned more toward the northwest. It attained its peak intensity on November 16, with maximum 10 minute sustained winds of 120 km/h (75 mph) and 1-minute winds of 140 km/h (85 mph). After weakening slightly, the storm found a weakness in the easterly steering currents and bore north, reintensifying slightly and directly striking southwestern Hainan. There, heavy rainfall and strong winds destroyed crops, livestock, and hundreds of homes, leaving $197 million (2003 USD) in damage. The storm rapidly deteriorated in the Gulf of Tonkin and dissipated as it neared mainland China.
==Meteorological history==

Nepartak originated in a region of strong thunderstorm activity, associated with a broad trough of low surface pressure, which was situated around 640 km (400 mi) southeast of Guam by 0000 UTC on November 11.〔 With weak wind shear and modest divergence of air over the system, it began to mature, although initially the Joint Typhoon Warning Center (JTWC) downplayed the potential for tropical cyclogenesis. Over the next several hours, a low-level circulation center became evident and convection organized around it, prompting the JTWC to issue an updated outlook.〔 At 1800 UTC, the Japan Meteorological Agency (JMA) classified the storm as a tropical depression while it was located northeast of Yap in the Caroline Islands.〔 The JTWC issued a tropical cyclone formation alert for the system at 2030 UTC, and designated it Tropical Depression 25W at 1200 UTC on November 12.〔 The system intensified gradually as it began to track quickly westward toward the Philippines.〔
The depression had found its way to the southwestern quadrant of a large anticyclone aloft, allowing for continued strengthening. Both the JMA and the JTWC upgraded the system to a tropical storm midday on November 12,〔〔 when it gained the name ''Nepartak'' from the JMA. Simultaneously, the cyclone entered the area of responsibility of the Philippine Atmospheric, Geophysical and Astronomical Services Administration, which named it Tropical Storm ''Weng''. Meteorologically, the storm began to exhibit improved outflow and deepening convection as it neared the central Philippines.〔 At around 1600 UTC on November 13, Nepartak made landfall on northern Samar Island in the Philippines before traversing the remainder of the archipelago from east to west.〔 The cyclone emerged into the South China Sea briefly weakened and with reduced forward motion, but quickly resumed its intensification trend as it turned more toward the northwest.〔 Shortly thereafter—at 0000 UTC on November 15—the JTWC further upgraded 25W to a typhoon.〔
Continuing generally toward the west-northwest under steering currents from a mid-level ridge to its north, Nepartak maintained its windspeeds throughout the day. With an improving appearance on satellite imagery, however, the storm gained some additional strength, and the JTWC estimated 25W to have attained its first peak intensity with maximum 1 minute sustained winds of 140 km/h (85 mph) at 0000 UTC on November 16.〔 Later that day, the JMA determined Nepartak to have reached maximum 10-minute winds of 120 km/h (75 mph), placing it at typhoon status. The cyclonic envelope began to ingest dry air from its surroundings, and convection began to wane, leading to slight weakening as the storm approached the island of Hainan. A shortwave trough soon cut a weakness in the mid-level ridge which had previously suppressed Nepartak to the south, allowing the cyclone to curve north and enhancing outflow over the storm. By late on November 17, a small eye feature about 19 km (12 mi) in diameter had formed, and at 0000 UTC the next day it was situated just offshore southwestern Hainan.〔
The cyclone's 1-minute winds increased once again to 140 km/h, marking its second and final peak at 0000 UTC on November 18.〔 The JMA, however, maintained Nepartak as a severe tropical storm.〔 The JTWC indicated that 25W made a second landfall on the coast of Hainan,〔 although the JMA did not make such mention, implying Nepartak's center remained over the Gulf of Tonkin.〔 Regardless, the cyclone's circulation had obscured most of Hainan and the Gulf of Tonkin and reached into adjacent Vietnam, and its forward speed slowed to a crawl. Extended interaction with land proved detrimental to the storm, and it began to rapidly disintegrate. Just 18 hours after its final bout of strengthening, Nepartak had been reduced to an exposed circulation center with no associated thunderstorms.〔 Turning toward the northeast, the system had been concurrently downgraded to a tropical depression by the JTWC and JMA early on November 19.〔〔 The weak remnant low of Nepartak limped ashore over Beihai, China at 1900 UTC and dissipated shortly thereafter.〔

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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