Tornado Warning — Cook County, Illinois
A tornado has been sighted or indicated by weather radar. Take shelter immediately in a sturdy building, away from windows.
Current Status
🌪️ Active: Tornado Warning
Tornado Warning issued August 11 at 11:05AM CDT until August 11 at 11:15AM CDT by NWS Chicago IL
The portion of the storm which prompted the Tornado Warning has moved out of the area. Therefore, the warning has been cancelled. However, a Severe Thunderstorm Warning remains in effect until 1115 AM.
Effective August 11, 2026 at 12:05 PM ET · Expires August 11, 2026 at 12:15 PM ET
Event Details
Event Type
Tornado Warning
Severity
extreme
Issued By
NWS Chicago IL
Expires
August 11, 2026 at 12:15 PM ET
Last Checked
40 minutes ago
Other Active Alerts in Illinois
Severe Thunderstorm Watch
Severe Thunderstorm Watch
Flood Advisory
Severe Thunderstorm Watch
Flood Advisory
Severe Thunderstorm Watch
Get Tornado Warning Alerts for Cook County
StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
Frequently Asked Questions
What does a Tornado Warning mean for Cook County, Illinois?
A tornado has been sighted or indicated by weather radar. Take shelter immediately in a sturdy building, away from windows.
Is this Tornado Warning currently active?
Yes — this alert is active as of our last check (40 minutes ago). It's set to expire August 11, 2026 at 12:15 PM ET.
How do I get notified about Tornado Warning alerts for Cook County?
Download StormCast free on Google Play and set Cook County, Illinois as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.