Illinois Severe Flood Warning | Effective 06/21/2026 08:13

Headline: 
Flood Warning issued June 21 at 10:13AM CDT until June 26 at 1:00AM CDT by NWS Lincoln IL
Event: 
Flood Warning
Urgency: 
Immediate
Effective: 
June 21, 2026 - 8:13am
Expires: 
June 22, 2026 - 12:15am
Description: 
...The Flood Warning is extended for the following rivers in Illinois... Sangamon River at Monticello affecting Piatt County. ...The Flood Warning continues for the following rivers in Illinois... Sangamon River near Chandlerville affecting Mason and Cass Counties. .The following forecasts are based on observed precipitation, soil moisture conditions, and forecast precipitation. * WHAT...Minor flooding is forecast. * WHERE...Sangamon River near Chandlerville. * WHEN...From Tuesday evening to early Friday morning. * ADDITIONAL DETAILS... - At 10:00 AM CDT Sunday the stage was 454.8 feet. - Forecast...The river is expected to rise above flood stage Tuesday evening to a crest of 457.0 feet early Wednesday afternoon. It will then fall below flood stage Thursday evening. - Flood stage is 456.6 feet. - http://www.weather.gov/safety/flood
Instruction: 
Persons with interests along this river need to remain aware of the latest forecasts and associated flood risk for their area. Stay tuned for further updates on this flooding situation. Additional information is available at www.weather.gov.
Area Description: 
Cass, IL; Mason, IL
Forcast Office: 
NWS Lincoln IL