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Hurricane Diana was the deadliest tropical cyclone during the 1990 Atlantic hurricane season, killing 139 people in Mexico. Forming out of a tropical wave on August 4, the system brushed Honduras before intensifying into a tropical storm the following day. Gradually gaining strength, Diana struck the Yucatán Peninsula with winds of 65 mph (100 km/h). Due land interaction, the cyclone weakened slightly before moving over the warm waters of the Bay of Campeche on August 6. Once over water, the Diana quickly became a hurricane and later reached its peak intensity on August 7 as a Category 2 on the Saffir–Simpson Hurricane Scale. Shortly thereafter, the storm made landfall near Tampico, Tamaulipas with winds of 100 mph (165 km/h). Rapid weakening ensued once the storm moved over the high terrain of Mexico and Diana diminished to a tropical depression roughly 24 hours after moving onshore. The cyclone later emerged into the Gulf of California on August 9 before dissipating, though its remnants were monitored until August 14 when the system lost its identity over Arizona. Throughout Mexico, Hurricane Diana produced torrential rains that triggered deadly flooding and landslides. Roughly 155 mi² (400 km²) of farmland was destroyed and 30,000 people were left homeless by the storm. Numerous roads and railways were either washed out or blocked by debris, cutting communication with several communities. In all, 139 people were killed in the country and $90 million (1990 USD) was wrought in damage. Due to the extensive loss of life and damage caused by Hurricane Diana, its name was retired the following year and replaced with Dolly. ==Meteorological history== The origins of Hurricane Diana were from a tropical wave that existed western Africa into the Atlantic on July 27. Conditions were unfavorable for development of a tropical cyclone, and the tropical wave remained disorganized until reaching the eastern Caribbean Sea. The system entered the Caribbean Sea through the southern Windward Islands, where falling barometric pressures were observed, decreasing by 3.5 mbar (hPa; 0.1 inHg) in 24 hours. Upper-level air data from the Lesser Antilles indicated that the tropical wave was associated with an upper-level anticyclone. With increasing convection, the first Air Force reconnaissance plane flight indicated no low-level circulation, but a relatively large amount of thunderstorm activity. The system continued to have a large amount of associated convection while passing over the Netherlands Antilles, as indicated by satellite images and surface observations. Cyclonic rotation was observed in the low-level convection by satellite images, and the fifth tropical depression of the season had developed at 0000 UTC on August 4, situated in the southwestern Caribbean Sea. However, this was based on surface observations, and it was not confirmed that tropical cyclone formation occurred until later that day. The new tropical depression moved to the northwest under the influence of a mid-level trough, and rapidly intensified to a tropical storm the following day offshore of eastern Honduras; the National Hurricane Center assigned the name Diana to the system. Becoming a tropical storm, Diana further intensified, and winds reached 65 mph (105 km/h) before landfall in Felipe Carrillo Puerto in Quintana Roo occurred. The storm initially rapidly weakened over land, although it retained winds of 50 mph (80 km/h) until moving over open waters. When Diana entered the southern Gulf of Mexico, the trough of low pressure in that vicinity weakened and steering currents caused the storm to head westward. Conditions became more favorable in the Gulf of Mexico, and Diana quickly intensified, becoming a hurricane late on August 7. Hurricane Diana rapidly intensified, and briefly reached Category 2 hurricane status, attaining peak intensity with winds of 100 mph (165 km/h) and a minimum barometric pressure of 980 mbar (hPa; 28.94 inHg). Only two hours after attaining peak intensity on August 7, Hurricane Diana made landfall near Tampico, Tamaulipas at the same intensity.〔 Moving inland, Diana rapidly weakened over the high terrain of Mexico, quickly deteriorating from a low-end Category 2 hurricane to a strong tropical storm within four hours. Diana continued westward over Mexico, and weakened to a tropical depression on August 8, while centered near Mexico City. The weakening tropical depression turned west-northwestward over central Mexico, and emerged into the Pacific Ocean on August 9, before dissipating in the Gulf of California.〔 The remnants of Hurricane Diana curved northward and tracked through the Gulf of California, and eventually came ashore in northwestern Sonora. Crossing northwestern Mexico, the remnants of Diana entered Arizona and quickly dissipated. 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 Diana」の詳細全文を読む スポンサード リンク
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