Weather Warnings for Illinois

Issued by the National Weather Service

Current watches, warnings, and advisories for Illinois
Alerts Updated: September 27, 2026, 6:13 am  UTC


Flood Warning issued September 26 at 9:12PM CDT until September 28 at 1:00PM CDT by NWS Chicago IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Des Plaines River near Gurnee affecting Lake IL County. Des Plaines River near Russell affecting Lake IL County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Des Plaines River from US-41 in Gurnee downstream to Townline Road in Vernon Hills, including the Gurnee gauge. * WHEN...Until Monday afternoon. * IMPACTS...At 7.0 feet, Forest land inundated near the river in Gurnee. * ADDITIONAL DETAILS... - At 8:30 PM CDT Saturday the stage was 7.9 feet. - Recent Activity...The river has continued a gradual fall. - Forecast...The river is expected to fall below flood stage on Monday. - Flood stage is 7.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  September 26, 2026, 9:12 pm      Expires:  September 27, 2026, 3:15 pm
Area:  Lake, IL


Flood Warning issued September 26 at 9:12PM CDT until October 1 at 7:00AM CDT by NWS Chicago IL

Summary: ...The Flood Warning continues for the following rivers in Illinois... Des Plaines River near Gurnee affecting Lake IL County. Des Plaines River near Russell affecting Lake IL County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Des Plaines River from IL/WI state line downstream to US-41 in Gurnee, including the Russell gauge. * WHEN...Until Thursday morning. * IMPACTS...At 8.0 feet, Agricultural and park land is inundated near the river. Residential property is threatened near the river. * ADDITIONAL DETAILS... - At 8:30 PM CDT Saturday the stage was 8.3 feet. - Recent Activity...The river has continued a gradual fall. - Forecast...The river is expected to fall below flood stage on Thursday. - Flood stage is 7.0 feet. - http://www.weather.gov/safety/flood
Severity:  Severe    Effective:  September 26, 2026, 9:12 pm      Expires:  September 27, 2026, 3:15 pm
Area:  Lake, IL


Flood Warning issued September 26 at 8:42PM CDT until September 28 at 4:00PM CDT by NWS St Louis MO

Summary: ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Clarksville. ...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Louisiana. 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 Clarksville. * WHEN...Until Monday afternoon. * IMPACTS...At 25.3 feet, The road to Port Marmac, a riverside community of about 13 homes just south of Clarksville, begins flooding. * ADDITIONAL DETAILS... - At 8:30 PM CDT Saturday the stage was 25.3 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:30 PM CDT Saturday was 25.5 feet. - Forecast...The river is expected to fall below flood stage late tomorrow morning and continue falling to 18.7 feet Saturday, October 03. - Flood stage is 25.0 feet.
Severity:  Severe    Effective:  September 26, 2026, 8:42 pm      Expires:  September 28, 2026, 8:45 am
Area:  Calhoun, IL; Pike, MO


Flood Warning issued September 26 at 8:42PM CDT until September 28 at 5:00PM CDT by NWS St Louis MO

Summary: ...The Flood Warning is extended for the following rivers in Illinois...Missouri... Mississippi River at Clarksville. ...The Flood Warning continues for the following rivers in Illinois...Missouri... Mississippi River at Louisiana. 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 Louisiana. * WHEN...Until Monday afternoon. * IMPACTS...At 15.0 feet, The first quarter mile of Edison Avenue beyond the railroad tracks begins flooding near this height. * ADDITIONAL DETAILS... - At 8:30 PM CDT Saturday the stage was 15.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:30 PM CDT Saturday was 15.7 feet. - Forecast...The river is expected to fall below flood stage late tomorrow morning and continue falling to 12.0 feet Saturday, October 03. - Flood stage is 15.0 feet.
Severity:  Severe    Effective:  September 26, 2026, 8:42 pm      Expires:  September 28, 2026, 8:45 am
Area:  Pike, IL; Pike, MO