|
Hurricane Ismael was responsible for significant flooding throughout the Inland Empire of the United States in August 1983. The origins of Hurricane Ismael were from a northward bulge of the Intertropical Convergence Zone (ITCZ) in early August, which resulted in the formation of a tropical depression on August 8. Six hours later, it was upgraded into Tropical storm Ismael. Continuing to intensify, Ismael was upgraded into a hurricane late on August 10 and subsequently developed an eye. After bypassing the Revillagigedo Islands, the storm reached its peak wind speed of . Late on August 11, Hurricane Ismael began to weaken as it encountered cooler waters. The following day, Ismael was downgraded into a tropical storm. On August 14, the storm was downgraded into a tropical depression approximately west of Point Ensenada. After turning north, Ismael dissipated later that day near Guadalupe Island. While still out at sea, Ismael brought waves to Southern California, though waves from the storm were less than expected. One person was swept away at a beach. The remnants of the storm later moved over the region, resulting in moderate rainfall. The Yucca Valley was the worst hit by the storm, where nearly every road was washed out. Almost 50,000 residents were isolated due to rains. A tornado was spotted near Los Angeles, causing minor damage. In San Bernardino, many buildings were destroyed. Around 80,000 homes were left without power across the Inland Empire. Moreover, three interstates were closed. In all, minor injuries were reported, three people died in San Bernardino when their car swept into a channel, and an engineer was killed returning to China Lake when her car was swept into a wash. Damage in the region totaled $19 million (1983 USD). After affecting California, the remnants of the hurricane moved into Nevada. Many parking lots in Laughlin were flooded; two small towns in Clark County were also isolated. Furthermore, several major streets along the outskirts of Las Vegas were closed because of flooding. ==Meteorological history== Hurricane Ismael originated from a northward bulge of the ITCZ in early August. On August 7, the Eastern Pacific Hurricane Center (EPHC) reported that this bulge had resulted in the formation of a tropical disturbance centered south of Acapulco. Late on August 8, the system was upgraded into a tropical depression.〔 Initially, the storm was expected to turn west and remain at sea;〔 〕 however, the depression turned northwest instead. Six hours after becoming a tropical cyclone, the low was upgraded into Tropical storm Ismael. After remaining a marginal tropical storm for 18 hours, Ismael began to deepen and by August 10, it was approaching hurricane intensity. By this time, the storm was forecast to accelerate and approach Guadalupe Island in three days.〔 At 1800 UTC on August 10, Ismael was upgraded into a hurricane. At 0245 UTC the next day, an eye began to form as the system passed east of the outer Revillagigedo Islands.〔 Nine hours later, the EPHC upgraded the storm into a Category 2 hurricane on the Saffir-Simpson Hurricane Wind Scale (SSHWS); simultaneously, the storm reached its peak of . At the time of its peak, Hurricane Ismael was located about west of Cabo San Lucas. Sandwiched between a ridge to the west of the hurricane and a trough off the coast of California, Ismael turned west north-west and accelerated.〔 Late on August 11, Hurricane Ismael began to weaken as it encountered cooler waters.〔 According to the EPHC, the storm was downgraded to a Category 1 on the SSHWS late on August 11. The following day, Ismael was downgraded into a tropical storm about west of the Baja California Peninsula. On August 13, Hurricane Hunters flew through the storm, penetrating the center of circulation twice.〔 During its first penetration, the aircraft reported winds of just east of the center and also noted that the weakening system had a poorly defined eye. Two hours later, the aircraft made its second pass through Tropical Storm Ismael, with the aircraft reporting winds of . Based on this, the storm was downgraded into a tropical depression while centered about west of Point Ensenada. After turning north and entering even cooler waters,〔 the storm made landfall on Guadalupe. The depression dissipated later on August 14 about southwest of Guadalupe Island which is not normally affected by tropical cyclones. 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 Ismael (1983)」の詳細全文を読む スポンサード リンク
|