CASPER, Wyo— Wyoming may be 4” below normally precipitation in 2020, but on August 1, 1985 a slow-moving thunderstorm dumped up to 8 inches on parts of Cheyenne in about three hours.
The storm caused 12 fatalities and 70 injuries, according to the National Oceanic and Atmospheric Administration, as well as damage in excess of $61 million.
Flash flooding and fast-rising water floated cars and trucks down the streets. Piles of hail 2 inches in diameter accumulated in nearly foot-tall piles, and the storm spawned 3 tornadoes.
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Among the victims was Laramie County Sheriff’s Deputy Robert Van Allen, according to The Jerusalem Post. He had tied himself to a telephone pole in order to try and save three people, including a young girl, from a submerged car, but was swept away when the rope broke.
National Weather Service officials said at the time it was a “once in 100 or 200 years” storm.