Illinois Flood Warning | Effective 04/21/2026 18:20

Headline: 
Flood Warning issued April 21 at 8:20PM CDT by NWS Chicago IL
Event: 
Flood Warning
Urgency: 
Immediate
Effective: 
April 21, 2026 - 6:20pm
Expires: 
April 22, 2026 - 12:30pm
Description: 
...The Flood Warning continues for the following rivers in Illinois... Rock River at Byron affecting Ogle County. Rock River at Rockton affecting Winnebago County. Rock River at Latham Park affecting Winnebago County. * WHAT...Moderate flooding is occurring and forecasted to continue. * WHERE...Rock River from Prairie Hill Road downstream to Swanson Road in Roscoe, including the Rockton gauge. * WHEN...Until further notice. * IMPACTS...At 12.0 feet, Multiple low-lying roads threatened along the river in Roscoe. * ADDITIONAL DETAILS... - At 7:30 PM CDT Tuesday the stage was 12.1 feet. - Forecast...The river is expected to only gradually fall through the week. It may fall into Minor flood stage early next week. - Flood stage is 10.0 feet. - http://www.weather.gov/safety/flood
Instruction: 
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. 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. Additional information is available at www.weather.gov. The next statement will be issued by Wednesday afternoon.
Area Description: 
Winnebago, IL
Forcast Office: 
NWS Chicago IL
Sender: 
w-nws.webmaster@noaa.gov