Illinois, Missouri Severe Flood Warning | Effective 06/18/2026 09:58

Headline: 
Flood Warning issued June 18 at 11:58AM CDT until June 21 at 9:24AM CDT by NWS St Louis MO
Event: 
Flood Warning
Urgency: 
Immediate
Effective: 
June 18, 2026 - 9:58am
Expires: 
June 19, 2026 - 10:00pm
Description: 
...The Flood Warning continues for the following rivers in Missouri...Illinois... Mississippi River at Chester. River forecasts are based on observed precipitation and forecast precipitation for the next 24 hours. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Mississippi River at Chester. * WHEN...Until Sunday morning. * IMPACTS...At 28.0 feet, Unleveed islands near Chester and the prison farm floods. * ADDITIONAL DETAILS... - At 11:30 AM CDT Thursday the stage was 28.6 feet and nearing a crest. - Recent Activity...The river rose above flood stage on June 15, cresting near 28.8 feet this morning, June 18. - Forecast...The river is cresting now, and is expected to fall below flood stage early Saturday morning. - Flood stage is 27.0 feet.
Instruction: 
Motorists should not attempt to drive around barricades or drive cars through flooded areas. This product, along with additional weather and stream information, is available at https://water.noaa.gov/wfo/lsx
Area Description: 
Jackson, IL; Randolph, IL; Perry, MO; Ste. Genevieve, MO
Forcast Office: 
NWS St Louis MO