Aug 17, 2025
Brief but intense heavy rainfall from thunderstorms, on top of weeks of wet weather, resulted in additional flooding across Marshall, Hamlin, Codington, and Deuel counties starting on the 17th and persisting well into the 18th. An estimated 3 inches of rain fell in Lake Poinsett, while 1.63 inches was recorded by the COOP sensor 20 miles north northeast of Aberdeen, 1.62 inches was submitted by the CoCoRaHS volunteer in Claremont, and 1.5 inches by the CoCoRaHS observer in Hayti. Flooding was m
Source: NOAA National Weather Service Storm Events Database (event 1290763). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Brown County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.