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Hurricane Ava was one of the strongest tropical cyclones ever recorded in the northeastern Pacific Ocean. It was the first named storm of the 1973 Pacific hurricane season. Forming in early June, Hurricane Ava eventually reached Category 5 intensity on the Saffir-Simpson Hurricane Scale, the first Pacific hurricane to do so in June and the earliest ever in a season. Its central pressure made it the most intense known Pacific hurricane at the time. Despite its intensity, Hurricane Ava stayed at sea without significant impact. Ava was given the most advanced measurement and reconnaissance available at the time. Recon flights were conducted and meteorological equipment was tested. The hurricane was also photographed from space by satellites and Skylab astronauts. ==Meteorological history== On June 2, 1973, a tropical depression formed about south of Salina Cruz, Oaxaca. It started out nearly stationary, and became a tropical storm late on the same day it formed, the first named storm of the 1973 Pacific hurricane season. Ava then slowly moved westwards away from Mexico and became a hurricane on June 3. Ava became a major hurricane on the afternoon of June 5. The next day, a United States Air Force recon flight measured a wind speed of 150 mph (250 km/h) and a central pressure of . These measurements made Hurricane Ava by far the most intense storm of the season. At its peak, Hurricane Ava had winds of 160 mph (260 km/h).〔 These winds made it a Category 5 on the Saffir-Simpson Hurricane Scale, the highest possible category〔(【引用サイトリンク】publisher=National Hurricane Center )〕 and the first Category 5 since the 1959 season. Ava was also a hurricane with windspeeds rapidly increasing the closer to the eye they were measured. Over a distance of 4 miles (6.5 km), wind speeds increased from 70 mph (110 km/h) to 158 mph (255 km/h), and they increased from 105 (165 m/h) to 158 mph (255 km/h) over half that distance. The reading of was roughly lower than the ambient environment far from the storm.〔 After its peak, Hurricane Ava started weakening on June 7 as it continued its westward path. Its winds were 140 mph (220 km/h) on June 7 and 115 mph (185 km/h) on the next day. It was no longer a major hurricane after its winds fell to 105 mph (165 km/h) on June 9. Later that day it weakened to a tropical storm. Tropical Storm Ava became Tropical Depression Ava on June 11. The system then turned north and dissipated on June 12. Its remnants then became embedded in the trade winds as a tropical wave.〔 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 Ava (1973)」の詳細全文を読む スポンサード リンク
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