National Weather Service United States Department of Commerce


Severe storms with tornadoes, large hail, damaging straight-line winds, heavy rain, and flash flooding moved across northeastern Wyoming and western South Dakota during the afternoon and evening of July 3, 2019. Tornadoes were reported near both Allen, South Dakota, and southwest of Dewey, South Dakota (located across the border in Wyoming). The lightning map to the right shows that there were concentrated areas of cloud-to-ground lightning flashes in both of those areas.

24-h CG lightning ending 6 am July 4th, 2019
24-hour cloud-to-ground lightning from 6 am July 4 to 6 am July 5, 2019
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