Flood Warning Illinois | Effective 04/04/2026 17:21

Headline: 
Flood Warning issued April 4 at 7:21PM CDT until April 6 at 5:00PM CDT by NWS Chicago IL
Event: 
Flood Warning
Urgency: 
Immediate
Effective: 
April 4, 2026 - 5:21pm
Expires: 
April 5, 2026 - 11:30am
Description: 
...The Flood Warning is extended for the following rivers in Illinois... Kishwaukee River at Belvidere affecting Winnebago and Boone Counties. Kishwaukee River near Perryville affecting Winnebago County. For the Kishwaukee River...including Belvidere, Perryville...Minor flooding is forecast. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Kishwaukee River from Confluence with South Branch Kishwaukee River downstream to the Rock River, including the Perryville gauge. * WHEN...Until Monday afternoon. * IMPACTS...At 15.0 feet, Old Perryville Road threatened south of Rockford. Widespread inundation of agricultural land and forest land near Chicago Rockford International Airport. * ADDITIONAL DETAILS... - At 6:30 PM CDT Saturday the stage was 13.0 feet. - Forecast...The river is expected to rise to a crest of 14.2 feet Sunday morning. It will then fall below flood stage late Monday morning. - Flood stage is 12.0 feet. - http://www.weather.gov/safety/flood
Instruction: 
A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by Sunday afternoon.
Area Description: 
Winnebago, IL
Forcast Office: 
NWS Chicago IL