Aug 10, 2025
Conditions were primed for flash flooding during the afternoon of August 10th. With very little wind shear, very high precipitable water values, and an area of moisture convergence, thunderstorms were able to develop and move very slowly as they poured out. This is what happened over the St. Louis metropolitan area. Flash flooding occurred as a result, with Interstates 44, 55, 64, 70, and 255 all suffering from water over the road.
Source: NOAA National Weather Service Storm Events Database (event 1281393). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in St. Louis (c) County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.