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Hurricane Kristy (2006)
Hurricane Kristy in 2006 was a relatively long-lived tropical cyclone in the 2006 Pacific hurricane season. It developed on August 30 from a tropical wave off the southwest coast of Mexico, and quickly intensified to attain hurricane status, reaching peak winds of 80 mph (130 km/h). Subsequently, Kristy weakened from cooler waters and increased wind shear from Hurricane John to its northeast. Steering currents weakened, and turning to a southerly drift, it weakened to a tropical depression by September 2. The next day it briefly regained tropical storm status, only to again deteriorate to depression status. After turning to the west, Kristy encountered marginally favorable conditions and attained tropical storm status for a third time, though unfavorable conditions caused it to dissipate on September 9. The storm never affected land,〔 although initially there was a slight threat to Clarion Island. Within the National Hurricane Center area of warning responsibility east of 140°W, Hurricane Kristy was the longest-lasting tropical cyclone of the season.
==Genesis==
A tropical wave moved off the west coast of Africa on August 13. With a large swirl of low clouds and little convection, the system tracked westward for two weeks across the Atlantic Ocean and Caribbean Sea, before crossing Central America on August 22. On August 29, the system became better organized, consisting of a broad low pressure area and thunderstorm activity. The convection persisted and organized further, and at 0000 UTC on August 30 it developed into Tropical Depression Twelve-E about 600 mi (970 km) southwest of the southern tip of the Baja California peninsula.〔
Upon becoming a tropical cyclone, the depression was experiencing slight easterly wind shear, which distorted the convection to the west of the circulation. However, favorable conditions for strengthening were expected, and the depression was forecast to reach peak winds of 50 mph (85 km/h) before weakening. It tracked slowly northwestward along the southern periphery of a ridge, and quickly intensified into Tropical Storm Kristy after convection increased over its circulation center. By that time, wind shear had decreased to very low levels, and with very warm waters, the storm was expected to quickly intensify to reach hurricane status. By late on August 30, the convection was wrapping into the center while an eye feature became intermittent. Organization continued, and Kristy attained hurricane status early on August 31, about 30 hours after forming.〔 Six hours after attaining hurricane status, an eye-like featured was evident on satellite imagery, and it is estimated Kristy attained peak winds of 80 mph (130 km/h) about 550 mi (880 km) southwest of the southern tip of the Baja California.〔 However, satellite-derived intensity estimates suggested the hurricane could have been as strong as 105 mph (170 km/h), or as weak as a tropical storm.
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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