On August 1, 1985 severe thunderstorms formed over the high plans of Wyoming as a result of a southeast flow of warm and humid air all the way from the Gulf of Mexico and a cold front slicing southward out of Canada and through Montana. Cheyenne, Wyoming received just over 6” of rain on that day more than 1/3 their average rainfall for an entire year. Many areas were flooded and power and telephone outages were widespread. Before the heavy rain, funnel clouds and tornadoes spotted in about every direction although no damage resulted. 1" of hail fell, that made parts of the city look like winter with hail covering the ground in drifts. Twelve people were killed including 10 along Dry Creek as people were swept away in cars while trying to cross flooded roads. The 6.06" that fell in Cheyenne broke the 24-hour state record. The resulting floods were reported as the costliest in state history - of more than $65 million.
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