Headline:
Flash Flood Warning issued September 20 at 5:09AM CDT until September 20 at 8:00AM CDT by NWS Chicago IL
Event:
Flash Flood Warning
Urgency:
Immediate
Effective:
September 20, 2026 - 3:09am
Expires:
September 20, 2026 - 6:00am
Description:
At 509 AM CDT, Doppler radar indicated thunderstorms produced heavy
rain across the warned area. Between 3 and 6 inches of rain have
fallen with the highest amounts across Lee County. While the heavy
rain has ended, additional heavy rain is possible later this morning.
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