National Weather Service United States Department of Commerce


Multiple rounds of severe weather moved across portions of southeastern SD, northwestern IA, and southwestern MN during the afternoon/evening hours on Saturday, Aug. 28, 2021. Extremely large hail, damaging winds, tornadoes, and flooding were reported. The combination of torrential rainfall and numerous rounds of storms triggered both flash flooding and river flooding for portions of the area, despite the drought conditions present at the time of the event.

Shelf Cloud near Canton, SD Saturday Afternoon

(Credit: Brett Davelaar)

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