Alert archive / Iowa / Johnson County
Severe Thunderstorm Warnings in Johnson County, Iowa
464 severe thunderstorm warnings since 1986. An alert counts here when it covered this county. The archive of severe thunderstorm warnings reaches back to 1986.
Johnson County and its neighbors
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Severe Thunderstorm Warnings
- 464
- Busiest year
- 202641 severe thunderstorm warnings
- Average year
- 12over 40 years on file
Over time
By year
Before October 2007 these were issued for whole counties, and a storm crossing three counties was often three warnings; since then one polygon follows the storm. The count changed with the practice, not only with the weather.
The latest severe thunderstorm warnings
The most recent on file, newest first.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 20, 1:18 AM CDT | Severe Thunderstorm Warning | DVN | 57 min |
| Sep 8, 9:07 PM CDT | Severe Thunderstorm Warning | DVN | 46 min |
| Sep 8, 8:18 PM CDT | Severe Thunderstorm Warning | DVN | 57 min |
| Aug 12, 5:25 AM CDT | Severe Thunderstorm Warning | DVN | 65 min |
| Aug 12, 4:37 AM CDT | Severe Thunderstorm Warning | DVN | 53 min |
| Aug 7, 5:26 PM CDT | Severe Thunderstorm Warning | DVN | 36 min |
| Jul 20, 5:11 PM CDT | Severe Thunderstorm Warning | DVN | 79 min |
| Jul 20, 10:51 AM CDT | Severe Thunderstorm Warning | DVN | 54 min |
| Jul 4, 4:25 AM CDT | Severe Thunderstorm Warning | DVN | 65 min |
| Jun 17, 7:08 AM CDT | Severe Thunderstorm Warning | DVN | 52 min |
| Jun 17, 6:45 AM CDT | Severe Thunderstorm Warning | DVN | 60 min |
| Jun 17, 5:52 AM CDT | Severe Thunderstorm Warning | DVN | 53 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.