Illinois Extreme Tornado Warning | Effective 08/11/2026 08:22

Headline: 
Tornado Warning issued August 11 at 10:22AM CDT until August 11 at 11:00AM CDT by NWS Chicago IL
Event: 
Tornado Warning
Urgency: 
Immediate
Effective: 
August 11, 2026 - 8:22am
Expires: 
August 11, 2026 - 9:00am
Description: 
At 1022 AM CDT, a severe squall line capable of producing both tornadoes and extensive straight line wind damage was located near Oswego, moving east at 55 mph. HAZARD...Tornado. SOURCE...Radar indicated rotation. IMPACT...Flying debris will be dangerous to those caught without shelter. Mobile homes will be damaged or destroyed. Damage to roofs, windows, and vehicles will occur. Tree damage is likely. Locations impacted include... Aurora, Joliet, Naperville, Bolingbrook, Downers Grove, Romeoville, Plainfield, Woodridge, Oswego, Lockport, New Lenox, Homer Glen, Mokena, Hinsdale, Lemont, Burr Ridge, Oak Brook, Westmont, Lisle, Darien, Crest Hill, Montgomery, Shorewood, Warrenville, and Willowbrook.
Instruction: 
Heavy rainfall may hide this tornado. Do not wait to see or hear the tornado. TAKE COVER NOW! This cluster of thunderstorms is capable of producing tornadoes and widespread significant wind damage. Do not wait to see or hear the tornado. For your protection move to an interior room on the lowest floor of a building.
Area Description: 
Cook, IL; DuPage, IL; Kane, IL; Kendall, IL; Will, IL
Forcast Office: 
NWS Chicago IL
Sender: 
w-nws.webmaster@noaa.gov