Weather alerts in Johnson County, Illinois
3,072 weather alerts since 1986, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Johnson County and its neighbors
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Alerts
- 3,072
- Warnings
- 713
- Watches
- 630
- Advisories
- 760
- Busiest year
- 2011184 alerts
- Average year
- 75over 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 1, 11:46 AM CDT | Extreme Heat Warning | PAH | 4 days |
| Aug 19, 10:57 PM CDT | Severe Thunderstorm Warning | PAH | 36 min |
| Aug 12, 9:04 PM CDT | Severe Thunderstorm Warning | PAH | 41 min |
| Aug 10, 12:50 AM CDT | Extreme Heat Warning | PAH | 7 days |
| Jul 25, 11:30 PM CDT | Extreme Heat Warning | PAH | 68 hr |
| Jul 20, 8:38 AM CDT | Extreme Heat Warning | PAH | 34 hr |
| Jul 11, 6:36 AM CDT | Areal Flood Warning | PAH | 8 hr |
| Jul 10, 11:09 PM CDT | Flash Flood Warning | PAH | 9 hr |
| Jul 10, 12:31 AM CDT | Flash Flood Warning | PAH | 6 hr |
| Jul 4, 3:59 PM CDT | Severe Thunderstorm Warning | PAH | 32 min |
| Jul 3, 7:50 PM CDT | Severe Thunderstorm Warning | PAH | 19 min |
| Jun 28, 11:28 AM CDT | Extreme Heat Warning | PAH | 5 days |
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.