Illinois Flood Warning | Effective 04/17/2026 08:38

Headline: 
Flood Warning issued April 17 at 10:38AM CDT until April 18 at 7:00PM CDT by NWS Chicago IL
Event: 
Flood Warning
Urgency: 
Immediate
Effective: 
April 17, 2026 - 8:38am
Expires: 
April 18, 2026 - 2:45am
Description: 
...The Flood Warning is extended for the following rivers in Illinois... Kishwaukee River near Perryville affecting Winnebago County. Kishwaukee River at Belvidere affecting Winnebago and Boone Counties. Pecatonica River near Shirland 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 County Line Road downstream to confluence with South Branch Kishwaukee River, including the Belvidere gauge. * WHEN...Until tomorrow evening. * IMPACTS...At 9.0 feet, Boone-McHenry County Line Road threatened. Low-lying areas are threatened in Belvidere Park. * ADDITIONAL DETAILS... - At 9:30 AM CDT Friday the stage was 9.3 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 9:30 AM CDT Friday was 9.4 feet. The river is currently cresting. - Forecast...The river is currently cresting. The river is expected to begin a slow fall by tomorrow. - Flood stage is 9.0 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 late tonight.
Area Description: 
Boone, IL; Winnebago, IL
Forcast Office: 
NWS Chicago IL