Jul 27, 2025
During the night of July 26th-July 27th, moisture convergence along a low-level jet spurred convection in eastern Missouri. This convection developed in an environment primed for efficient and heavy rainfall. Thunderstorms trained over Calhoun County, causing roads to flood and culverts to wash out.
Source: NOAA National Weather Service Storm Events Database (event 1278132). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Calhoun County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.