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Flash Flood — Marshall, SD

Aug 5, 2025

A line of storms produced large hail and high winds during the afternoon and evening of August 5th, and into the early morning hours of August 6th. The largest sized hail measured at 3 inches in diameter was observed in Hoven. Later in the evening, a peak wind gust of 99 mph was recorded on a weather station out at Sandy Shore State Park, while the Watertown Regional Airport ASOS would record a peak gust of 68 mph. Over 40 trees were topped or downed as a result of these winds around the Lake Ka

Source: NOAA National Weather Service Storm Events Database (event 1289328). Narrative written by NWS staff at the time of the event.

Flood Risk Context for Marshall, SD

This event is one of many recorded floods in Marshall County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.

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