Headline:
Flash Flood Warning issued September 20 at 2:12AM CDT until September 20 at 8:00AM CDT by NWS Chicago IL
Event:
Flash Flood Warning
Urgency:
Immediate
Effective:
September 20, 2026 - 12:12am
Expires:
September 20, 2026 - 6:00am
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...
Lee County in north central Illinois...
* Until 800 AM CDT.
* At 212 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to 3 inches of rain have
fallen. The expected rainfall rate is 1.5 to 2.5 inches per hour.
Additional rainfall amounts of 1 to 3 inches are possible in the
warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
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, Shabbona, Lake Holiday,
Hinckley, Somonauk, Earlville, Waterman, Serena, Leland, Paw Paw,
Sublette, Woodhaven Lakes, Millington, Lee, Compton, Troy Grove,
Nelson, West Brooklyn, Harmon, Triumph, Prairie Center and Lee
Center.
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.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Area Description:
De Kalb, IL; La Salle, IL; Lee, IL
Forcast Office:
NWS Chicago IL
Sender:
w-nws.webmaster@noaa.gov