Alert archive / Illinois / Johnson County / Severe Thunderstorm Watches
Severe Thunderstorm Watches in Johnson County, Illinois, 2021
7 severe thunderstorm watches in 2021. An alert counts here when it covered this county. The archive of severe thunderstorm watches reaches back to 1997.
Johnson County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Severe Thunderstorm Watches
- 7
- Busiest month
- May2 severe thunderstorm watches
- Busiest day
- July 10, 20212 severe thunderstorm watches
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 |
|---|---|---|---|
| Mar 27, 8:19 PM CDT | Severe Thunderstorm Watch | SPC | 114 min |
| Apr 28, 12:40 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 4, 1:41 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 6, 12:38 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 10, 1:36 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 10, 2:01 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 12, 7:37 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
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.