Illinois Flash Flood Warning | Effective 04/17/2026 18:12
Public safety alert, emergency alert, and weather alert
Description:
FFWLOT
The National Weather Service in Chicago has issued a
* Flash Flood Warning for...
Boone County in north central Illinois...
Lake IL County in northeastern Illinois...
McHenry County in northeastern Illinois...
* Until 200 AM CDT.
* At 812 PM CDT, Doppler radar indicated thunderstorms producing
extremely heavy rain across and moving into the warned area. These
storms will produce rainfall rates up to an inch in less 30