Illinois Flash Flood Warning - Severe | Effective 06/11/2026 15:30

Headline: 
Flash Flood Warning issued June 11 at 5:30PM CDT until June 11 at 9:30PM CDT by NWS Chicago IL
Event: 
Flash Flood Warning
Urgency: 
Immediate
Effective: 
June 11, 2026 - 3:30pm
Expires: 
June 11, 2026 - 7:30pm
Description: 
FFWLOT The National Weather Service in Chicago has issued a * Flash Flood Warning for... Winnebago County in north central Illinois... * Until 930 PM CDT. * At 530 PM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Up to 1 inch of rain has fallen. The expected rainfall rate is 1 to 2 inches in 1 hour. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding. SOURCE...Radar. IMPACT...Rapid-onset flooding of creeks, streams, drainage ditches, streets, underpasses, low-lying areas, and other poor drainage areas. * Some locations that will experience flash flooding include... Rockford, Loves Park, Machesney Park, Roscoe, South Beloit, Rockton, Rockford Airport, Cherry Valley, Winnebago, Davis Junction, Pecatonica, Lake Summerset, Durand, New Milford, Seward, Harrison and Shirland.
Instruction: 
A Flash Flood Warning means rapid-onset flooding is imminent or may already be occurring. Persons along creeks, drainage ditches, and other waterways should take immediate precautions to protect life and property.
Area Description: 
Winnebago, IL
Forcast Office: 
NWS Chicago IL
Sender: 
w-nws.webmaster@noaa.gov