Alert archive / Illinois / Cook County / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Cook County, Illinois, 2021
27 severe thunderstorm warnings in 2021. An alert counts here when it covered this county. The archive of severe thunderstorm warnings reaches back to 1986.
Cook County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Severe Thunderstorm Warnings
- 27
- Busiest month
- June9 severe thunderstorm warnings
- Busiest day
- June 21, 20213 severe thunderstorm warnings
Over time
By month
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 29, 6:37 PM CDT | Severe Thunderstorm Warning | LOT | 38 min |
| Jun 12, 1:52 PM CDT | Severe Thunderstorm Warning | LOT | 68 min |
| Jun 12, 2:26 PM CDT | Severe Thunderstorm Warning | LOT | 41 min |
| Jun 20, 10:40 PM CDT | Severe Thunderstorm Warning | LOT | 50 min |
| Jun 20, 10:56 PM CDT | Severe Thunderstorm Warning | LOT | 79 min |
| Jun 20, 11:30 PM CDT | Severe Thunderstorm Warning | LOT | 30 min |
| Jun 26, 12:34 PM CDT | Severe Thunderstorm Warning | LOT | 41 min |
| Jun 26, 12:59 PM CDT | Severe Thunderstorm Warning | LOT | 11 min |
| Jun 26, 1:26 PM CDT | Severe Thunderstorm Warning | LOT | 34 min |
| Jun 28, 2:43 PM CDT | Severe Thunderstorm Warning | LOT | 40 min |
| Jul 24, 3:54 PM CDT | Severe Thunderstorm Warning | LOT | 51 min |
| Jul 24, 4:26 PM CDT | Severe Thunderstorm Warning | LOT | 49 min |
| Jul 24, 5:01 PM CDT | Severe Thunderstorm Warning | LOT | 59 min |
| Jul 28, 4:50 AM CDT | Severe Thunderstorm Warning | LOT | 25 min |
| Jul 29, 2:14 AM CDT | Severe Thunderstorm Warning | LOT | 76 min |
| Jul 29, 2:58 AM CDT | Severe Thunderstorm Warning | LOT | 77 min |
| Aug 9, 7:18 PM CDT | Severe Thunderstorm Warning | LOT | 42 min |
| Aug 10, 6:34 PM CDT | Severe Thunderstorm Warning | LOT | 86 min |
| Aug 10, 6:55 PM CDT | Severe Thunderstorm Warning | LOT | 95 min |
| Aug 11, 9:40 AM CDT | Severe Thunderstorm Warning | LOT | 65 min |
| Aug 11, 9:43 PM CDT | Severe Thunderstorm Warning | LOT | 26 min |
| Aug 12, 2:55 AM CDT | Severe Thunderstorm Warning | LOT | 50 min |
| Aug 24, 7:08 PM CDT | Severe Thunderstorm Warning | LOT | 67 min |
| Aug 25, 5:42 PM CDT | Severe Thunderstorm Warning | LOT | 33 min |
| Aug 25, 6:29 PM CDT | Severe Thunderstorm Warning | LOT | 31 min |
| Sep 7, 1:41 PM CDT | Severe Thunderstorm Warning | LOT | 49 min |
| Sep 7, 3:28 PM CDT | Severe Thunderstorm Warning | LOT | 62 min |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.