Apr 29, 2021
Southerly flow as well as intermittent showers and a few thunderstorms raised the dew point into the mid 60s to around 70 across the area. Also, forecast soundings showed a very moist and deep warm layer up to around 12,000 feet. This combined with strong 850mb moisture convergence across southern Missouri and Illinois and precipitable water values in the 99th plus percentile, set the region up for a heavy rain and flash flood event. Up to three inches of rain fell in a short amount of time ca
Source: NOAA National Weather Service Storm Events Database (event 951497). 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.