Illinois Flash Flood Warning | Effective 05/18/2026 12:54

FFWLSX The National Weather Service in St Louis has issued a * Flash Flood Warning for... Southern Bond County in south central Illinois... Clinton County in south central Illinois... Southwestern Fayette County in south central Illinois... Western Marion County in south central Illinois... Northern Washington County in south central Illinois... Southeastern Madison County in southwestern Illinois... Northeastern Saint Clair County in southwestern Illinois... * Until 900 PM CDT Monday. * At 254 PM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 2 inches of rain have fallen. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar indicated. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Breese, New Baden, Carlyle, Trenton, Aviston, Okawville, St. Rose, Germantown, Albers, Wamac, Beckemeyer, Pocahontas, Tamalco, Beaver Creek, Jamestown, Boulder, Shattuc, New Memphis and Pleasant Mound. This includes the following State Parks... Carlyle Lake State Fish and Wildlife Area and Eldon Hazlet State Recreation Area. This includes Interstate 64 in Illinois near exit 34.