Aug 12, 2025
During the afternoon of August 12th, thunderstorms developed along an axis of weak surface convergence. The environment they existed in was conducive for gusty winds and heavy rain. In St. Louis City, a continuously back-building thunderstorm caused flash flood conditions with numerous major interstates being closed from the amount of water atop them.
Source: NOAA National Weather Service Storm Events Database (event 1278811). 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.