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1980 United States heat wave
The 1980 United States Heat Wave was a period of intense heat and drought that wreaked havoc on much of the Midwestern United States and Southern Plains throughout the summer of 1980. It is among the most devastating natural disasters in terms of deaths and destruction in U.S. history, claiming at least 1,700 lives〔(Impacts of Temperature Extremes )〕 and because of the massive drought, agricultural damage reached US$20.0 billion (US$55.4 billion in 2007 dollars, adjusted for the GNP inflation index).〔(National Climatic Data Center - ''Chronological List of U.S. Billion Dollar Events'' - 22-Jul-2008 )〕 It is among the billion-dollar weather disasters listed by the National Oceanic and Atmospheric Administration.
==Causes==
The heat wave began in June when a strong high pressure ridge began to build in the central and southern United States allowing temperatures to soar to almost every day from June to September. The high pressure system also acted as a cap on the atmosphere inhibiting the development of thunderstorm activity leading to exceptionally severe drought conditions. The heat wave broke only when decaying Hurricane Allen disrupted the prevailing weather pattern.
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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