On the northern rim of the high pressure ridge, several severe long-lived windstorms called derechos formed. The high temperatures of the 1980 heat wave were worse than 2011, as was its early start in June and its ultimate human toll. The 2011 North American heat wave would ultimately surpass the 1980 heat wave in terms of number of days with highs exceeding 100 (with 71 days) and the highest-ever low temperature for a single day (86 degrees) however, that heat wave only had 40 consecutive days of temperatures exceeding 100 (two short of the record) and the 113 degrees of 1980 remains a DFW all-time high. Hurricane Allen briefly paused the heat wave in early August. Some 43% of American homes were without air conditioning in 1980. The area saw 29 days in which the previous record high temperature was either broken or tied, including its all-time high when the temperature hit 113 ☏ (45 ☌) on three consecutive days (June 26 and 27 at DFW Airport and June 28 at Dallas Love Field). In Dallas/Fort Worth, Texas, high temperatures exceeded 100 ☏ (38 ☌) a total of 69 times, including a record 42 consecutive days from June 23 to August 3, of which 28 days were above 105, and five days above 110. In Indianapolis, Indiana on July 15, the temperature reached 100 ☏ (38 ☌) for the first time since 1954. In Kansas City, Missouri, the high temperature was below 90 ☏ (32 ☌) only twice and soared above the century mark (100 ☏ or 38 ☌) for 17 days straight in Memphis, Tennessee, the temperature reached an all-time high of 108 ☏ (42 ☌) on July 13, 1980, part of a 15-day stretch of temperatures above 100 ☏ (38 ☌) that lasted from July 6 to 20. The drought and heat wave conditions led many Midwestern cities to experience record heat. The heat wave paused briefly when the decaying Hurricane Allen disrupted the prevailing weather pattern. 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 began in June when a strong high pressure ridge began to build in the central and southern United States allowing temperatures to soar to 90 ☏ (32 ☌) almost every day from June to September. It is among the billion-dollar weather disasters listed by the National Oceanic and Atmospheric Administration. Because of the massive drought, agricultural damage reached US$20 billion (equivalent to $71 billion in 2022 dollars ). It was among the most destructive and most lethal natural disasters in U.S. 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.
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