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Hurricane Trudy (1990)
Hurricane Trudy was a very powerful, very long-lived late-season hurricane that formed in the October of 1990. The 20th named storm and 26th tropical cyclone of the above-average 1990 Pacific hurricane season, it formed as a tropical wave which moved across the northeast Pacific and formed a tropical depression south of Mexico on October 16. It strengthened at a moderate pace and reached hurricane intensity on October 18. Trudy entered a favorable environment and explosively intensified, reaching its first peak in strength on October 20. At that time, an upper-level trough drifted Trudy north, which increased vertical shear, causing it to substantially weaken the system back to Category 1 hurricane status. The trough outran the storm and was replaced by a ridge which turned the storm back to the west and led to its re-intensification to a Category 4 hurricane. Another upper level trough approached which pulled Trudy northward once again, and sheared the hurricane apart. The cyclone dissipated on November 1. Eventually, some of its moisture spread over parts of Mexico and the United States.
== Meteorological history ==
The tropical wave that would become future Hurricane Trudy became identifiable on satellite imagery as early as September 30, emerging near the African coast off Cape Verde. However, the wave did not show any signs of development until October 16, when the wave developed into a tropical depression several hundred kilometers south of Acapulco. The tropical depression intensified significantly. The ship ''Maple Ace'' reported tropical storm-force winds about from the center at 1800 UTC on October 18. In less than 36 hours, at 1200 UTC on October 20, Trudy became a powerful hurricane with Category Four equivalent maximum winds of and a minimum pressure of according to satellite estimates. The hurricane was at least as intense as Hurricane Max three years earlier and Hurricane Hernan earlier in the year. Estimates state that Trudy may have been the strongest eastern Pacific hurricane since wind estimates have been available from satellite images.
An upper-level trough forced Trudy to move northwards, increasing the risk of hurricane conditions to Baja California residents. The same trough caused an unfavorable environment that caused Trudy to weaken considerably. At that time, dynamically based numeral models forecasted Trudy to move northwards over Baja California and make landfall there. However, the trough progressed eastwards and was replaced by a ridge, and Trudy assumed a westward motion away from land. Trudy then started to re-intensify, developing an unusually large eye of nearly in diameter.〔 However, another deep trough approached Trudy and pulled the hurricane northwards, shearing it at the same time. Trudy dissipated on November 1 at 1800 UTC. Its remnant moistures spread over parts of Mexico and the United States.〔
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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