May 14, 2024
Surface low pressure was drifting across the Quad State on the 14th. Showers and thunderstorms popped up in the afternoon to evening hours with the strongest storm in Southern Illinois moving through Marion, producing damage to vinyl fencing and minor street flooding. CAPE values around 1000 J/kg dropped off after sunset. Lapse rates were meager, around 6 C/km, and shear was also limited to around 25 kts.
Source: NOAA National Weather Service Storm Events Database (event 1182164). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Williamson County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.