Alert archive / Iowa / Johnson County
Weather alerts in Johnson County, Iowa, 2020
129 weather alerts in 2020, 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 in 2020. Tap one for its archive.
- Alerts
- 129
- Warnings
- 30
- Watches
- 24
- Advisories
- 31
- Busiest month
- June26 alerts
- Busiest day
- July 9, 20207 alerts
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 |
|---|---|---|---|
| Jan 3, 2:23 PM CST | Winter Weather Advisory | DVN | 13 hr |
| Jan 9, 3:33 AM CST | Wind Advisory | DVN | 11 hr |
| Jan 9, 11:21 AM CST | Winter Storm Watch | DVN | 16 hr |
| Jan 10, 3:17 AM CST | Winter Storm Warning | DVN | 43 hr |
| Jan 10, 5:50 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 14, 2:11 PM CST | Winter Weather Advisory | DVN | 24 hr |
| Jan 15, 3:43 PM CST | Winter Storm Watch | DVN | 23 hr |
| Jan 16, 2:17 PM CST | Winter Storm Warning | DVN | 52 hr |
| Jan 18, 3:13 PM CST | Wind Chill Advisory | DVN | 21 hr |
| Jan 23, 9:06 PM CST | Winter Weather Advisory | DVN | 15 hr |
| Jan 26, 3:00 PM CST | Dense Fog Advisory | DVN | 19 hr |
| Feb 1, 12:49 AM CST | Dense Fog Advisory | DVN | 6 hr |
| Feb 11, 3:00 PM CST | Winter Weather Advisory | DVN | 45 hr |
| Feb 12, 3:28 AM CST | Wind Chill Advisory | DVN | 23 hr |
| Feb 13, 10:05 AM CST | Wind Chill Advisory | DVN | 24 hr |
| Feb 17, 5:27 PM CST | Dense Fog Advisory | DVN | 7 hr |
| Feb 23, 10:35 AM CST | Winter Storm Watch | DVN | 28 hr |
| Mar 4, 2:55 PM CST | Wind Advisory | DVN | 36 hr |
| Mar 19, 8:40 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Mar 19, 9:12 PM CDT | Special Weather Statement | DVN | 33 min |
| Mar 20, 7:03 AM CDT | River Flood Warning | DVN | 24 hr |
| Mar 25, 4:41 AM CDT | Dense Fog Advisory | DVN | 5 hr |
| Mar 28, 1:05 AM CDT | Special Weather Statement | DVN | 40 min |
| Mar 28, 1:34 AM CDT | Mesoscale Discussion | SPC | 56 min |
| Mar 28, 1:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Mar 28, 2:45 PM CDT | Tornado Watch | SPC | 6 hr |
| Mar 28, 5:21 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Mar 28, 9:26 PM CDT | Wind Advisory | DVN | 22 hr |
| Apr 7, 5:26 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 7, 7:22 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Apr 7, 7:29 PM CDT | Severe Thunderstorm Warning | DVN | 46 min |
| Apr 7, 8:06 PM CDT | Severe Thunderstorm Warning | DVN | 39 min |
| Apr 7, 8:45 PM CDT | Severe Thunderstorm Warning | DVN | 30 min |
| Apr 7, 9:14 PM CDT | Severe Thunderstorm Warning | DVN | 31 min |
| Apr 9, 2:52 AM CDT | Wind Advisory | DVN | 16 hr |
| Apr 12, 3:42 AM CDT | Wind Advisory | DVN | 36 hr |
| Apr 16, 2:12 AM CDT | Winter Weather Advisory | DVN | 29 hr |
| May 7, 4:00 AM CDT | Freeze Watch | DVN | 23 hr |
| May 8, 3:16 AM CDT | Freeze Warning | DVN | 29 hr |
| May 10, 2:36 PM CDT | Frost Advisory | DVN | 16 hr |
| May 14, 11:38 AM CDT | Flash Flood Watch | DVN | 19 hr |
| May 14, 6:15 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 15, 3:00 AM CDT | Dense Fog Advisory | DVN | 4 hr |
| May 23, 11:29 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 23, 12:18 PM CDT | Tornado Warning | DVN | 42 min |
| May 23, 12:33 PM CDT | Tornado Watch | SPC | 8 hr |
| May 23, 2:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| May 25, 8:33 PM CDT | Special Weather Statement | DVN | 27 min |
| May 26, 2:01 PM CDT | Severe Thunderstorm Warning | DVN | 32 min |
| May 26, 2:53 PM CDT | Special Weather Statement | DVN | 37 min |
| May 26, 4:35 PM CDT | Severe Thunderstorm Warning | DVN | 25 min |
| May 28, 3:32 AM CDT | Flash Flood Watch | DVN | 15 hr |
| Jun 3, 4:56 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 3, 5:47 AM CDT | Special Weather Statement | DVN | 43 min |
| Jun 3, 6:37 AM CDT | Special Weather Statement | DVN | 23 min |
| Jun 4, 12:59 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jun 4, 5:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 5, 1:02 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 5, 4:17 AM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 8, 3:23 AM CDT | Flash Flood Watch | DVN | 40 hr |
| Jun 9, 3:04 PM CDT | Special Weather Statement | DVN | 56 min |
| Jun 9, 5:41 PM CDT | Areal Flood Warning | DVN | 11 hr |
| Jun 9, 6:58 PM CDT | Flash Flood Warning | DVN | 4 hr |
| Jun 9, 8:19 PM CDT | River Flood Warning | DVN | 62 hr |
| Jun 9, 8:47 PM CDT | River Flood Warning | DVN | 48 hr |
| Jun 10, 12:45 AM CDT | Special Weather Statement | DVN | 45 min |
| Jun 10, 1:13 AM CDT | Special Weather Statement | DVN | 32 min |
| Jun 10, 3:49 AM CDT | Flash Flood Watch | DVN | 12 hr |
| Jun 22, 3:12 AM CDT | Special Weather Statement | DVN | 63 min |
| Jun 22, 9:19 AM CDT | River Flood Warning | DVN | 7 days |
| Jun 22, 9:19 AM CDT | River Flood Warning | DVN | 7 days |
| Jun 22, 9:19 AM CDT | River Flood Warning | DVN | 13 hr |
| Jun 22, 10:03 AM CDT | Flash Flood Watch | DVN | 9 hr |
| Jun 26, 12:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 1:38 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 27, 3:28 PM CDT | Special Weather Statement | DVN | 62 min |
| Jun 27, 3:37 PM CDT | Flash Flood Warning | DVN | 2 hr |
| Jun 27, 5:08 PM CDT | Flash Flood Warning | DVN | 83 min |
| Jul 7, 2:38 PM CDT | Heat Advisory | DVN | 28 hr |
| Jul 9, 10:24 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 9, 11:05 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 9, 2:51 PM CDT | Special Weather Statement | DVN | 24 min |
| Jul 9, 2:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 9, 3:21 PM CDT | Special Weather Statement | DVN | 24 min |
| Jul 9, 3:56 PM CDT | Severe Thunderstorm Warning | DVN | 34 min |
| Jul 9, 5:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 11, 9:36 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 11, 10:04 AM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jul 11, 3:58 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 11, 5:25 PM CDT | Severe Thunderstorm Warning | DVN | 50 min |
| Jul 11, 6:07 PM CDT | Severe Thunderstorm Warning | DVN | 38 min |
| Jul 11, 6:09 PM CDT | Severe Thunderstorm Warning | DVN | 51 min |
| Jul 11, 6:46 PM CDT | Severe Thunderstorm Warning | DVN | 44 min |
| Jul 11, 7:17 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jul 17, 3:04 AM CDT | Heat Advisory | DVN | 41 hr |
| Jul 25, 2:30 AM CDT | Heat Advisory | DVN | 41 hr |
| Jul 26, 6:00 PM CDT | Special Weather Statement | DVN | 45 min |
| Jul 26, 6:50 PM CDT | Special Weather Statement | DVN | 55 min |
| Aug 10, 10:42 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 10, 11:26 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 10, 11:48 AM CDT | Severe Thunderstorm Warning | DVN | 57 min |
| Aug 10, 12:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 10, 12:34 PM CDT | Severe Thunderstorm Warning | DVN | 56 min |
| Aug 10, 12:42 PM CDT | Severe Thunderstorm Warning | DVN | 48 min |
| Aug 24, 12:18 PM CDT | Heat Advisory | DVN | 7 hr |
| Aug 25, 3:07 AM CDT | Heat Advisory | DVN | 16 hr |
| Aug 28, 2:56 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Aug 28, 3:16 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Sep 5, 9:34 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 5, 11:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Sep 6, 1:06 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Sep 6, 2:32 AM CDT | Mesoscale Discussion | SPC | 88 min |
| Sep 6, 2:53 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 6, 5:30 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Sep 11, 2:28 PM CDT | Flash Flood Watch | DVN | 15 hr |
| Oct 4, 2:54 AM CDT | Frost Advisory | DVN | 29 hr |
| Oct 15, 3:15 AM CDT | Freeze Warning | DVN | 29 hr |
| Oct 16, 1:43 PM CDT | Wind Advisory | DVN | 28 hr |
| Oct 22, 2:35 AM CDT | Dense Fog Advisory | DVN | 9 hr |
| Oct 22, 4:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Nov 14, 3:35 AM CST | Wind Advisory | DVN | 38 hr |
| Nov 24, 9:16 PM CST | Dense Fog Advisory | DVN | 11 hr |
| Dec 11, 2:08 AM CST | Winter Weather Advisory | DVN | 36 hr |
| Dec 12, 1:19 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 23, 3:43 AM CST | Wind Advisory | DVN | 23 hr |
| Dec 28, 3:19 AM CST | Winter Storm Watch | DVN | 17 hr |
| Dec 28, 3:15 PM CST | Winter Storm Warning | DVN | 38 hr |
| Dec 29, 2:17 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 29, 6:05 PM CST | Special Weather Statement | DVN | 85 min |
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 | 14 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 11 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 28 |
| Special Weather Statement | 16 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 3 |
| River Flood Warning | 6 |
| Flash Flood Watch | 6 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 4 |
| Winter Weather Advisory | 6 |
| Heat | |
| Heat Advisory | 5 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 8 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.