Illinois Severe Flood Warning | Effective 06/20/2026 16:37

Headline: 
Flood Warning issued June 20 at 6:37PM CDT by NWS St Louis MO
Event: 
Flood Warning
Urgency: 
Immediate
Effective: 
June 20, 2026 - 4:37pm
Expires: 
June 22, 2026 - 4:45am
Description: 
...The Flood Warning continues for the following rivers in Illinois... Illinois River at Meredosia. Illinois River at La Grange LD. Illinois River at Valley City. Illinois River at Hardin. 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...Illinois River at La Grange LD. * WHEN...Until further notice. * IMPACTS...At 24.0 feet, Extensive wetland acreage south of La Grange begins flooding. * ADDITIONAL DETAILS... - At 6:00 PM CDT Saturday the stage was 23.6 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 6:00 PM CDT Saturday was 23.6 feet. - Forecast...The river is expected to rise to a crest of 25.5 feet Friday morning. - Flood stage is 23.0 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: 
Brown, IL
Forcast Office: 
NWS St Louis MO