Headline:
Flash Flood Warning issued September 17 at 7:07AM CDT until September 17 at 11:00AM CDT by NWS Chicago IL
Event:
Flash Flood Warning
Urgency:
Immediate
Effective:
September 17, 2026 - 5:07am
Expires:
September 17, 2026 - 9:00am
Description:
FFWLOT
The National Weather Service in Chicago has issued a
* Flash Flood Warning for...
Southern De Kalb County in north central Illinois...
Northern La Salle County in north central Illinois...
Southeastern Lee County in north central Illinois...
* Until 1100 AM CDT.
* At 707 AM CDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
2 and 4 inches of rain have fallen. Additional rainfall amounts up
to 1 inch are possible in the warned area. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
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...
Sandwich, Mendota, Amboy, Sheridan, Lake Holiday, Somonauk,
Earlville, Leland, Paw Paw, Sublette, Woodhaven Lakes, Millington,
Compton and West Brooklyn.
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:
De Kalb, IL; La Salle, IL; Lee, IL
Forcast Office:
NWS Chicago IL
Sender:
w-nws.webmaster@noaa.gov