Cook County IL Tornado Warnings — Live Alerts & History
Illinois · updates automatically
Active Tornado Warnings
No active tornado warnings for Cook County right now
This page updates automatically — new NWS tornado warnings for the county appear here within about a minute of issuance.
Tornado History for Cook County (Since 1950)
Tornadoes on Record
74
1950–present · NOAA/SPC
Violent (EF3+)
2
2.7% of total
Fatalities
37
722 injuries
Strongest Rating
F4
Fujita / Enhanced Fujita
Most Recent
March 19, 2025
Latest tornado on record
Recent Tornado Warning History
| Date | Issued | Expired |
|---|---|---|
| August 11, 2026 | 3:36 PM UTC | 4:04 PM UTC |
| August 11, 2026 | 3:29 PM UTC | 4:15 PM UTC |
| August 11, 2026 | 3:10 PM UTC | 4:00 PM UTC |
| July 27, 2026 | 5:55 PM UTC | 6:33 PM UTC |
| July 27, 2026 | 5:50 PM UTC | 6:33 PM UTC |
| July 27, 2026 | 5:10 PM UTC | 5:56 PM UTC |
| June 24, 2026 | 11:08 PM UTC | 11:45 PM UTC |
| June 12, 2026 | 1:17 AM UTC | 1:45 AM UTC |
| June 12, 2026 | 12:54 AM UTC | 1:10 AM UTC |
| April 18, 2026 | 3:31 AM UTC | 4:00 AM UTC |
Cook County Facts
- FIPS Code
- 17031
- NWS County Code (UGC)
- ILC031
More for Cook County
Recent warning events
Active warnings come from the National Weather Service and refresh on
this page about once a minute. Tornado climatology is computed from the
NOAA/SPC storm events archive (1950–present). VORTEX is not a substitute
for official NWS warnings or a NOAA Weather Radio.