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Hurricane Fefa was a major Pacific hurricane of the 1991 Pacific hurricane season that despite causing minimal effects its name was removed from the list of tropical cyclone names. The sixth tropical storm, fourth hurricane, and second major hurricane of the season, the storm developed from a tropical wave on July 29 about 975 miles (1,575 km) south-southeast of Cabo San Lucas. It moved west-northwestward, and under generally favorable conditions it strengthened to attain peak winds of 120 mph (195 km/h) on August 2. Fefa turned to the west towards Hawaii, and slowly weakened until dissipating near the island of Hawaii. The hurricane produced rough surf, moderate wind gusts, and locally heavy rainfall during its passage over Hawaii. No damages or deaths were reported. Two people were injured in the island of Hawaii due to lightning strikes from the storm. ==Meteorological history== A westward-moving tropical wave exited the coast of Africa on July 17. It tracked across the unfavorable Atlantic Ocean and Caribbean Sea without development, and after crossing Central America, it entered the eastern Pacific Ocean on July 25. The cloud pattern and convection began to become better organized on July 28, and shortly thereafter a mid-level circulation developed. It continued to organize, and subsequent to the development of a low-level circulation it formed into Tropical Depression Seven-E while located about 975 miles (1,575 km) south-southeast of Cabo San Lucas on July 29. Operationally, tropical cyclone advisories were not initiated until visible satellite images confirmed the low-level circulation twelve hours after the depression formed. Located over warm waters with fair upper level outflow,〔 the depression quickly intensified and attained tropical storm status twelve hours after forming.〔 Upon strengthening into a tropical storm, Fefa developed a curved cloud band over the southern and eastern portion of the center.〔 The storm slowly strengthened as it tracked west-northwestward, a motion due to the presence of a high-pressure ridge to its north. Fefa initially strengthened slowly; on the day after it became a tropical storm the center was located on the western edge of the deep convection. On July 31, convection began increasing over the center, and it is estimated it intensified into a hurricane later that day while located about 710 miles (1,145 km) southwest of the southern tip of Baja California.〔 Initially, Fefa was forecast to intensify slightly after reaching hurricane status to reach peak winds of 80 mph (130 km/h). However, it quickly intensified after a large, ragged eye developed early on August 1. On August 2, the eye organized further, and Fefa strengthened to attain a peak intensity of 120 mph (195 km/h) while located about 940 miles (1,510 km) west-southwest of Cabo San Lucas.〔 Based on higher Dvorak numbers, the hurricane could have peaked with winds stronger than 120 mph (195 km/h). Fefa encountered cooler waters shortly after peaking in intensity, and subsequently began to weaken. The hurricane gradually weakened as it turned more to the west, a change in motion due to building high pressures to its north, and on August 3 the winds of Fefa dropped to 85 mph (135 km/h)〔 due to cooler water and dry air. As Fefa turned more to the west, it paralleled the cooler waters, allowing the eye to remain distinct as the hurricane remained well-organized. Despite moving over marginally warm sea surface temperatures and becoming involved with the Stratocumulus cloud field to its north, the hurricane restrengthened on August 4 to reach a secondary peak intensity of 105 mph (170 km/h) while located about 1,265 miles (2,070 km) east-southeast of Hilo, Hawai'i. After maintaining 105 mph (170 km/h) winds for about 18 hours, Fefa weakened slightly due to increasing wind shear from a cold-core trough as it entered the Central Pacific Hurricane Center area of responsibility. As the shear increased, the cyclone weakened more rapidly, and on August 6 it weakened to a tropical storm while located about 650 miles (1,060 km) east of the island of Hawaii.〔 Initially, forecasters predicted Fefa to turn to the northwest to the north of the Hawaiian Islands. However, the storm continued moving almost due westward as it steadily weakened. Aircraft reconnaissance flew into Fefa three times as it neared Hawaii. Late on August 7, Fefa weakened to a tropical depression a short distance of the island of Hawaii, and early on August 8 the depression began dissipating and degenerated into a tropical wave after moving onshore. The remnants tracked west-northwestward and passed south of the Hawaiian Islands until dissipating on August 9 to the northwest of Kauai. 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「Hurricane Fefa」の詳細全文を読む スポンサード リンク
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