Cook County, Illinois: tornado and severe weather warnings
Nothing is in effect for Cook County as of 4:42 PM CDT: no warnings, watches or advisories. This page checks the National Weather Service every minute.
Open the live map on Cook County Get a message when a warning reaches your address
The map shows radar, every warning shape, and the path and arrival time of each storm cell headed toward the center of Cook County. Tap your own street on it for times that apply to you.
The last 12 months in Cook County
- 10 tornado warnings
- 64 severe thunderstorm warnings
- 17 flash flood warnings
- 4 tornado watches
- 17 severe thunderstorm watches
The most recent tornado warning that included Cook County was issued Aug 11, 2026 by the Weather Service office in Chicago, IL.
| Date | Issued | Type | Office | Product |
|---|---|---|---|---|
| Aug 12, 2026 | 9:26 AM CDT | Severe thunderstorm warning | LOT | text |
| Aug 11, 2026 | 10:36 AM CDT | Tornado warning | LOT | text |
| Aug 11, 2026 | 10:29 AM CDT | Tornado warning | LOT | text |
| Aug 11, 2026 | 10:20 AM CDT | Severe thunderstorm warning | LOT | text |
| Aug 11, 2026 | 10:17 AM CDT | Severe thunderstorm warning | LOT | text |
| Aug 11, 2026 | 10:10 AM CDT | Tornado warning | LOT | text |
| Aug 9, 2026 | 11:22 PM CDT | Severe thunderstorm warning | LOT | text |
| Aug 9, 2026 | 3:14 PM CDT | Severe thunderstorm warning | LOT | text |
| Aug 9, 2026 | 2:51 PM CDT | Severe thunderstorm warning | LOT | text |
| Aug 9, 2026 | 2:51 PM CDT | Severe thunderstorm warning | LOT | text |
| Aug 9, 2026 | 1:03 PM CDT | Severe thunderstorm warning | LOT | text |
| Aug 1, 2026 | 7:41 AM CDT | Flash flood warning | LOT | text |
A warning counts here if the Weather Service listed Cook County in it, even if the warned area covered only part of the county.
Nearby
- Lake County, IL
- DuPage County, IL
- Lake County, IN
- Will County, IL
- Porter County, IN
- Kane County, IL
- Kendall County, IL
- Berrien County, MI
- All of Illinois
What the alerts mean
Alerts come from the National Weather Service and refresh every minute. Past warnings come from the Iowa Environmental Mesonet's archive of Weather Service products. During a warning, also listen to local radio, TV or a weather radio.