Illinois Flash Flood Warning | Effective 04/15/2026 20:10

Headline: 
Flash Flood Warning issued April 15 at 10:10PM CDT until April 16 at 2:30AM CDT by NWS Chicago IL
Event: 
Flash Flood Warning
Urgency: 
Immediate
Effective: 
April 15, 2026 - 8:10pm
Expires: 
April 16, 2026 - 12:30am
Description: 
At 1010 PM CDT, Doppler radar rainfall estimates indicate that between 1.25 and 1.80 inches of rain has fallen across portions of Winnebago and far northwest Boone counties over the past two hours. This is in addition to in excess of two inches of rain which occurred across the area Tuesday evening. 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, Belvidere, Loves Park, Machesney Park, Roscoe, South Beloit, Rockton, Poplar Grove, Rockford Airport, Candlewick Lake, Cherry Valley, Winnebago, Davis Junction, Pecatonica, Lake Summerset, Durand, Capron, Timberlane, New Milford and Garden Prairie. The heaviest rainfall has moved southeast of the warned area in the past hour, though additional rainfall with rates up to a quarter of an inch per hour may continue through midnight.
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: 
Boone, IL; Winnebago, IL
Forcast Office: 
NWS Chicago IL