Illinois Flash Flood Warning - Severe | Effective 06/11/2026 16:28

Headline: 
Flash Flood Warning issued June 11 at 6:28PM CDT until June 11 at 10:00PM CDT by NWS Chicago IL
Event: 
Flash Flood Warning
Urgency: 
Immediate
Effective: 
June 11, 2026 - 4:28pm
Expires: 
June 11, 2026 - 8:00pm
Description: 
FFWLOT The National Weather Service in Chicago has issued a * Flash Flood Warning for... Lake IL County in northeastern Illinois... * Until 1000 PM CDT. * At 628 PM CDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Up to 1 inch of rain has fallen. The expected rainfall rate is 1 to 2 inches in 1 hour. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding. SOURCE...Radar. 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... Waukegan, Arlington Heights, Palatine, Buffalo Grove, Wheeling, Northbrook, North Chicago, Gurnee, Mundelein, Highland Park, Round Lake Beach, Vernon Hills, Zion, Grayslake, Libertyville, Lake Zurich, Lake Forest, Round Lake, Antioch and Wauconda.
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: 
Lake, IL
Forcast Office: 
NWS Chicago IL