Alert archive / Illinois / Flash Flood Warnings in 2026
Flash Flood Warning 57, NWS Chicago, IL
NWS Chicago, IL issued this flash flood warning at Sep 17, 2026, 7:07 AM CDT for DeKalb County, LaSalle County, Lee County, Illinois. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 17, 2026, 7:07 AM CDT (12:07 UTC)
- Expired
- Sep 17, 2026, 9:35 AM CDT
- In force
- 2 hr
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Flood severity
- None
Counties DeKalb County, IL, LaSalle County, IL, Lee County, IL
The radar
The Chicago radar (KLOT), 75 km from the middle of the area, began a volume at 12:10 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 17, 6:37 AM CDT | Areal Flood Advisory | LOT | Cook, DuPage, Kendall, Will | 5 hr |
| Sep 17, 6:49 AM CDT | Areal Flood Advisory | LOT | DeKalb, LaSalle, Lee | 5 hr |
| Sep 17, 10:48 AM CDT | Marine Dense Fog Advisory | LOT | 4 hr | |
| Sep 17, 2:39 PM CDT | Beach Hazards Statement | LOT | Cook, Lake | 24 hr |
| Sep 17, 2:50 PM CDT | Small Craft Advisory | LOT | 24 hr |
Nearby
Flash Flood Warnings in Illinois, 2026Every flash flood warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.