Alert archive / Iowa / Johnson County / 2026
Weather alerts in Johnson County, Iowa, August 2026
22 weather alerts in August 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
- Alerts
- 22
- Warnings
- 5
- Watches
- 7
- Advisories
- 5
- Busiest day
- August 13, 20266 alerts
Over time
By day
Days in UTC, the clock the archive keeps.
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 |
|---|---|---|---|
| Aug 7, 2:53 AM CDT | Dense Fog Advisory | DVN | 6 hr |
| Aug 7, 1:40 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 7, 4:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 5:26 PM CDT | Severe Thunderstorm Warning | DVN | 36 min |
| Aug 9, 1:41 AM CDT | Heat Advisory | DVN | 18 hr |
| Aug 11, 4:13 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 7:22 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 12, 4:37 AM CDT | Severe Thunderstorm Warning | DVN | 53 min |
| Aug 12, 4:37 AM CDT | Mesoscale Discussion | SPC | 53 min |
| Aug 12, 5:25 AM CDT | Severe Thunderstorm Warning | DVN | 65 min |
| Aug 12, 6:19 AM CDT | Flash Flood Warning | DVN | 3 hr |
| Aug 12, 6:41 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 13, 2:22 AM CDT | Flood Watch | DVN | 56 hr |
| Aug 13, 2:35 AM CDT | Dense Fog Advisory | DVN | 6 hr |
| Aug 13, 5:47 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 13, 7:27 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 13, 11:10 AM CDT | River Flood Watch | DVN | 68 hr |
| Aug 13, 11:14 AM CDT | River Flood Watch | DVN | 72 hr |
| Aug 13, 11:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Aug 14, 3:24 PM CDT | River Flood Warning | DVN | 3 days |
| Aug 16, 4:31 AM CDT | Dense Fog Advisory | DVN | 4 hr |
| Aug 30, 1:04 PM CDT | Heat Advisory | DVN | 6 days |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 3 |
| Severe Thunderstorm Watch | 4 |
| Mesoscale Discussion | 5 |
| Flooding | |
| Flash Flood Warning | 1 |
| River Flood Warning | 1 |
| Flood Watch | 1 |
| River Flood Watch | 2 |
| Heat | |
| Heat Advisory | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive2025
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. Warning verification from the Mesonet's Cow. Rebuilt daily.