Home / South Dakota / Union
Flash Flood in Union County, South Dakota
Flash Flood July 24, 2025 · Union County, South Dakota
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
Multiple roadways and intersections were inundated by water deep enough to impede travel.
The wider storm
A cluster of thunderstorms erupted within a very moist and unstable airmass ahead of a slow moving frontal boundary during the evening of July 23. These thunderstorms bisected the city of Sioux Falls from southwest to northeast with neighborhoods southeast of I-229 reporting 2 to 5 inches of rain in a matter of 1-2 hours. This resulted in significant flash flooding across impacted portions of the city. Later in the evening, a large mesoscale convective system across Nebraska moved north and east, bringing heavy rain to portions of southeast South Dakota. Additional localized flash flooding was observed after midnight in Beresford, South Dakota.
Began near Beresford (43.0834, -96.7652).
Source: NOAA Storm Events Database, event 1287280. Narratives are written by the National Weather Service forecast office that issued the report.
Tornadoes near your address
See every tornado that passed near a place you know, measured to its path.
We couldn’t get your location. Check that location access is allowed for this site, or type an address.