Weather alerts in Cook County, Illinois
3,863 weather alerts since 1986, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Cook County and its neighbors
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Alerts
- 3,863
- Warnings
- 1,536
- Watches
- 467
- Advisories
- 852
- Busiest year
- 2026320 alerts
- Average year
- 94over 41 years on file
Over time
By year
Before late 2005 the archive holds only tornado, severe thunderstorm, flash flood and marine warnings, and from 1997 SPC's watches, so the jump that year is the archive widening, not the weather.
By month of the year
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The latest warnings
The most recent on file, newest first.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 19, 9:05 PM CDT | River Flood Warning | LOT | 17 hr |
| Sep 3, 1:08 AM CDT | Extreme Heat Warning | LOT | 13 hr |
| Aug 14, 8:16 AM CDT | River Flood Warning | LOT | 42 hr |
| Aug 12, 9:26 AM CDT | Severe Thunderstorm Warning | LOT | 64 min |
| Aug 11, 8:48 PM CDT | River Flood Warning | LOT | 43 hr |
| Aug 11, 11:24 AM CDT | Lakeshore Flood Warning | LOT | 6 hr |
| Aug 11, 10:36 AM CDT | Tornado Warning | LOT | 28 min |
| Aug 11, 10:29 AM CDT | Tornado Warning | LOT | 46 min |
| Aug 11, 10:20 AM CDT | Severe Thunderstorm Warning | LOT | 55 min |
| Aug 11, 10:17 AM CDT | Severe Thunderstorm Warning | LOT | 58 min |
| Aug 11, 10:10 AM CDT | Tornado Warning | LOT | 50 min |
| Aug 9, 11:22 PM CDT | Severe Thunderstorm Warning | LOT | 38 min |
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Rebuilt daily.