Aug 21, 2019
A cluster of strong to severe thunderstorms developed over the Interstate 64 corridor of southern Illinois during the evening. These storms produced locally damaging wind and isolated flash flooding as they drifted slowly eastward. The storms developed as a minor 500 mb shortwave trough moved into northwest Missouri, embedded within a broad cyclonic flow over the Great Lakes region and upper Mississippi Valley. The atmosphere remained moist and unstable well into the evening. Elevated layer cape
Source: NOAA National Weather Service Storm Events Database (event 845429). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Jefferson County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.