National Weather Service United States Department of Commerce


Severe thunderstorms marched across northeastern Wyoming and the Black Hills area the afternoon and evening of July 17, 2019. Tennis ball to baseball size hail was reported around Gillette and the northern Black Hills, and a tornado occurred near Four Corners, Wyoming. Higher concentrations of cloud-to-ground lightning flashes can be seen in these areas in the image to the right.

24-h CG lightning ending 6 am July 18th, 2019
24-hour cloud-to-ground lightning from 6 am July 17 to 6 am July 18, 2019
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