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Hurricane Hernan (2008)
Hurricane Hernan was the ninth tropical depression, eighth named storm, fifth hurricane, and first major hurricane of the 2008 Pacific hurricane season. Hernan developed out of a tropical wave that formed off the east coast of Africa on July 24. Over the next week, the wave traversed the Atlantic without development and entered the Eastern Pacific basin on August 2. The wave became better organized over the next several days and was declared Tropical Depression Nine-E on August 6. The depression quickly became Tropical Storm Hernan later that day. Hernan steadily intensified over the next two days and was upgraded to a hurricane on the morning of August 8.
Hernan continued to intensify and became the first major hurricane—a storm with winds of 111 mph (178 km/h) or higher—of the season on August 9. After reaching major hurricane status, Hernan steadily weakened to a minimal hurricane. The weakening continued, and Hernan was further downgraded to a tropical storm on August 11. As Hernan moved over cold waters, the convection associated with the storm dissipated, leaving only a swirl of clouds. By the morning of August 12, almost all of the convection associated with Hernan had dissipated and the system was declared a remnant low-pressure area. The remnants of the hurricane caused light rain to Hawaii.
==Origins==
On July 24, a tropical wave emerged from the east coast of Africa, near the Cape Verde Islands. The wave was disorganized and failed to develop convection as it traversed the Atlantic Ocean| over the next several days. The wave eventually entered the Eastern Pacific basin on August 2, and interacted with a broad area of cyclonic flow located a few hundred miles south of Mexico. The wave became better organized throughout the day, and an area of low pressure formed 660 mi (1060 km) south of Manzanillo, Mexico on August 5.〔 Strong convection began to develop. That day, a banding feature formed On the morning of August 6, a Tropical Cyclone Formation Alert was issued. Later in the day, the National Hurricane Center determined that the system had developed sufficient convection to be declared Tropical Depression Nine-E while located 775 mi (1230 km) to the south-southwest of the southern tip of Baja California Sur.〔 However, the storm was operationally believed to have become a depression several hours later.
Tropical Depression Nine-E was influenced by a high pressure area located over Mexico, causing it to move 16 mph (26 km/h) to the north-west. The depression was upgraded to Tropical Storm Hernan overnight as the storm became more organized. Although Hernan was located over warm waters, moderate wind shear prevented the storm from intensifying quickly, and the storm slwoed. Hernan slowly became better organized throughout the night, but wind shear continued to impair Hernan through the morning; as a result, most of the tropical cyclone forecast models did not predict Hernan to become a hurricane.
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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