Sep 4, 2022
An upper level system stalled out over the region with plenty of low level moisture convergence on the nose of a modest low level jet. The forcing was focused over south central Illinois, so this is the area that got the most rainfall. A couple of isolated areas had over 4 inches of rain in a short amount of time, causing flash flooding.
Source: NOAA National Weather Service Storm Events Database (event 1057111). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Montgomery County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.