Alert archive / Iowa / Calhoun County
Weather alerts in Calhoun County, Iowa, 2025
149 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Calhoun County and its neighbors
Each county as a circle sized by its count in 2025. Tap one for its archive.
- Alerts
- 149
- Warnings
- 45
- Watches
- 25
- Advisories
- 44
- Busiest month
- March26 alerts
- Busiest day
- March 14, 20258 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Calhoun County, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 28 | 13 | 54% | 4 | 100% | 34 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Des Moines, IA: tornado warnings | 24 | 1 | 96% | 5 | 20% | 0 min |
| NWS Des Moines, IA: severe thunderstorm warnings | 254 | 125 | 51% | 349 | 78% | 23 min |
| NWS Des Moines, IA: flash flood warnings | 18 | 7 | 61% | 11 | 82% | 79 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
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 17, 2:37 PM CST | Cold Weather Advisory | DMX | 45 hr |
| Jan 19, 2:48 AM CST | Cold Weather Advisory | DMX | 32 hr |
| Jan 20, 2:46 AM CST | Cold Weather Advisory | DMX | 33 hr |
| Jan 20, 2:46 AM CST | Extreme Cold Warning | DMX | 33 hr |
| Feb 2, 3:55 AM CST | Dense Fog Advisory | DMX | 7 hr |
| Feb 4, 1:55 PM CST | Winter Weather Advisory | DMX | 34 hr |
| Feb 10, 2:57 AM CST | Winter Weather Advisory | DMX | 24 hr |
| Feb 11, 2:50 AM CST | Winter Weather Advisory | DMX | 42 hr |
| Feb 12, 2:32 AM CST | Cold Weather Advisory | DMX | 30 hr |
| Feb 14, 12:11 PM CST | Winter Weather Advisory | DMX | 26 hr |
| Feb 16, 3:18 AM CST | Extreme Cold Watch | DMX | 24 hr |
| Feb 17, 3:44 AM CST | Extreme Cold Warning | DMX | 32 hr |
| Feb 18, 3:24 AM CST | Cold Weather Advisory | DMX | 33 hr |
| Feb 19, 3:37 AM CST | Cold Weather Advisory | DMX | 29 hr |
| Feb 20, 2:39 AM CST | Cold Weather Advisory | DMX | 30 hr |
| Feb 27, 2:09 PM CST | Red Flag Warning | DMX | 28 hr |
| Feb 27, 2:09 PM CST | Wind Advisory | DMX | 28 hr |
| Mar 3, 2:56 AM CST | Winter Storm Watch | DMX | 24 hr |
| Mar 3, 2:39 PM CST | High Wind Watch | DMX | 12 hr |
| Mar 4, 2:36 AM CST | High Wind Warning | DMX | 36 hr |
| Mar 4, 11:51 AM CST | Blizzard Warning | DMX | 27 hr |
| Mar 4, 12:40 PM CST | High Wind Warning | DMX | 29 hr |
| Mar 4, 2:50 PM CST | Winter Weather Advisory | DMX | 27 hr |
| Mar 4, 7:20 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Mar 4, 11:17 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Mar 5, 2:43 PM CST | Wind Advisory | DMX | 3 hr |
| Mar 6, 2:40 AM CST | Winter Weather Advisory | DMX | 35 hr |
| Mar 14, 2:38 PM CDT | Wind Advisory | DMX | 27 hr |
| Mar 14, 3:19 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 14, 5:01 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Mar 14, 5:12 PM CDT | Severe Thunderstorm Warning | DMX | 48 min |
| Mar 14, 5:28 PM CDT | Severe Thunderstorm Warning | DMX | 47 min |
| Mar 14, 5:49 PM CDT | Severe Thunderstorm Warning | DMX | 56 min |
| Mar 14, 6:04 PM CDT | Severe Thunderstorm Warning | DMX | 41 min |
| Mar 14, 6:42 PM CDT | Severe Thunderstorm Warning | DMX | 36 min |
| Mar 17, 2:50 AM CDT | Red Flag Warning | DMX | 17 hr |
| Mar 17, 3:28 AM CDT | Winter Storm Watch | DMX | 36 hr |
| Mar 17, 2:50 PM CDT | High Wind Watch | DMX | 24 hr |
| Mar 18, 4:10 AM CDT | Blizzard Warning | DMX | 41 hr |
| Mar 18, 4:10 AM CDT | High Wind Warning | DMX | 42 hr |
| Mar 19, 4:37 AM CDT | Mesoscale Discussion | SPC | 113 min |
| Mar 19, 5:54 AM CDT | Mesoscale Discussion | SPC | 5 hr |
| Mar 22, 2:22 PM CDT | Wind Advisory | DMX | 29 hr |
| Apr 2, 3:05 AM CDT | Wind Advisory | DMX | 16 hr |
| Apr 14, 4:06 PM CDT | Special Weather Statement | DMX | 84 min |
| Apr 14, 5:35 PM CDT | Special Weather Statement | DMX | 85 min |
| Apr 17, 3:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 18, 12:42 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 23, 12:59 AM CDT | Special Weather Statement | DMX | 31 min |
| Apr 23, 1:30 AM CDT | Special Weather Statement | DMX | 45 min |
| Apr 23, 4:43 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Apr 23, 7:14 PM CDT | Severe Thunderstorm Warning | DMX | 46 min |
| Apr 23, 7:43 PM CDT | Severe Thunderstorm Warning | DMX | 47 min |
| Apr 23, 7:58 PM CDT | Severe Thunderstorm Warning | DMX | 47 min |
| Apr 23, 8:16 PM CDT | Severe Thunderstorm Warning | DMX | 44 min |
| Apr 28, 3:27 PM CDT | Tornado Watch | SPC | 8 hr |
| Apr 28, 5:03 PM CDT | Wind Advisory | DMX | 3 hr |
| May 14, 9:28 PM CDT | Wind Advisory | DMX | 24 hr |
| May 15, 2:27 PM CDT | Wind Advisory | DMX | 31 hr |
| Jun 7, 2:34 PM CDT | Special Weather Statement | DMX | 26 min |
| Jun 11, 1:56 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 11, 2:53 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 14, 6:36 PM CDT | Special Weather Statement | DMX | 24 min |
| Jun 14, 6:47 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 16, 5:11 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 16, 6:15 PM CDT | Severe Thunderstorm Warning | DMX | 60 min |
| Jun 16, 6:43 PM CDT | Severe Thunderstorm Warning | DMX | 47 min |
| Jun 16, 7:03 PM CDT | Severe Thunderstorm Warning | DMX | 57 min |
| Jun 16, 7:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 18, 1:43 PM CDT | Extreme Heat Watch | DMX | 38 hr |
| Jun 19, 1:55 PM CDT | Extreme Heat Warning | DMX | 3 days |
| Jun 23, 2:34 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 11:28 AM CDT | Flood Watch | DMX | 19 hr |
| Jun 25, 2:38 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 25, 5:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 26, 11:29 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 4:47 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 7, 9:41 PM CDT | Special Weather Statement | DMX | 34 min |
| Jul 7, 10:12 PM CDT | Special Weather Statement | DMX | 33 min |
| Jul 10, 1:39 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 1:17 PM CDT | Flood Watch | DMX | 30 hr |
| Jul 11, 10:14 PM CDT | Severe Thunderstorm Warning | DMX | 35 min |
| Jul 19, 1:54 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 19, 2:48 PM CDT | Flood Watch | DMX | 18 hr |
| Jul 22, 2:02 PM CDT | Heat Advisory | DMX | 30 hr |
| Jul 24, 12:06 AM CDT | Severe Thunderstorm Warning | DMX | 39 min |
| Jul 26, 2:36 AM CDT | Extreme Heat Watch | DMX | 11 hr |
| Jul 26, 2:04 PM CDT | Heat Advisory | DMX | 30 hr |
| Jul 27, 2:43 PM CDT | Extreme Heat Warning | DMX | 29 hr |
| Jul 28, 9:39 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 10:07 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 28, 10:35 PM CDT | Severe Thunderstorm Warning | DMX | 70 min |
| Jul 28, 10:50 PM CDT | Severe Thunderstorm Warning | DMX | 55 min |
| Jul 28, 11:32 PM CDT | Severe Thunderstorm Warning | DMX | 58 min |
| Jul 29, 3:08 PM CDT | Flood Watch | DMX | 23 hr |
| Jul 29, 8:24 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 29, 9:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jul 29, 11:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 30, 1:16 AM CDT | Severe Thunderstorm Warning | DMX | 44 min |
| Aug 6, 3:34 AM CDT | Special Weather Statement | DMX | 86 min |
| Aug 6, 4:57 AM CDT | Special Weather Statement | DMX | 93 min |
| Aug 7, 2:42 PM CDT | Heat Advisory | DMX | 28 hr |
| Aug 9, 5:31 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Aug 9, 6:04 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 9, 6:10 AM CDT | Severe Thunderstorm Warning | DMX | 50 min |
| Aug 9, 6:59 AM CDT | Severe Thunderstorm Warning | DMX | 46 min |
| Aug 9, 7:29 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 9, 7:32 AM CDT | Severe Thunderstorm Warning | DMX | 43 min |
| Aug 9, 8:10 AM CDT | Severe Thunderstorm Warning | DMX | 50 min |
| Aug 10, 2:51 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 15, 11:51 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 15, 12:21 PM CDT | Severe Thunderstorm Warning | DMX | 39 min |
| Aug 15, 12:30 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 15, 12:50 PM CDT | Severe Thunderstorm Warning | DMX | 40 min |
| Aug 15, 1:41 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Aug 15, 2:51 PM CDT | Heat Advisory | DMX | 29 hr |
| Aug 19, 1:32 AM CDT | Dense Fog Advisory | DMX | 7 hr |
| Sep 3, 5:56 AM CDT | Severe Thunderstorm Warning | DMX | 22 min |
| Sep 16, 2:21 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Sep 16, 5:52 PM CDT | Severe Thunderstorm Warning | DMX | 22 min |
| Sep 16, 8:23 PM CDT | Flash Flood Warning | DMX | 3 hr |
| Sep 16, 8:23 PM CDT | Severe Thunderstorm Warning | DMX | 21 min |
| Sep 22, 8:35 PM CDT | Severe Thunderstorm Warning | DMX | 40 min |
| Oct 21, 2:00 PM CDT | Frost Advisory | DMX | 19 hr |
| Oct 22, 2:20 AM CDT | Frost Advisory | DMX | 31 hr |
| Oct 22, 2:31 PM CDT | Freeze Warning | DMX | 18 hr |
| Oct 30, 1:33 AM CDT | Dense Fog Advisory | DMX | 9 hr |
| Nov 7, 9:12 PM CST | Winter Weather Advisory | DMX | 17 hr |
| Nov 20, 5:01 AM CST | Dense Fog Advisory | DMX | 7 hr |
| Nov 24, 2:32 PM CST | Wind Advisory | DMX | 44 hr |
| Nov 25, 12:21 AM CST | Dense Fog Advisory | DMX | 10 hr |
| Nov 27, 3:21 AM CST | Winter Storm Watch | DMX | 23 hr |
| Nov 27, 2:19 PM CST | Winter Storm Warning | DMX | 60 hr |
| Dec 5, 3:03 AM CST | Winter Storm Watch | DMX | 11 hr |
| Dec 5, 1:47 PM CST | Winter Storm Warning | DMX | 37 hr |
| Dec 5, 1:47 PM CST | Winter Weather Advisory | DMX | 37 hr |
| Dec 6, 12:25 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 8, 2:24 PM CST | Winter Storm Watch | DMX | 23 hr |
| Dec 9, 1:31 PM CST | High Wind Warning | DMX | 19 hr |
| Dec 9, 1:31 PM CST | Winter Weather Advisory | DMX | 16 hr |
| Dec 11, 2:31 AM CST | Winter Weather Advisory | DMX | 19 hr |
| Dec 12, 3:35 AM CST | Winter Weather Advisory | DMX | 35 hr |
| Dec 12, 2:20 PM CST | Cold Weather Advisory | DMX | 44 hr |
| Dec 17, 2:58 AM CST | Wind Advisory | DMX | 45 hr |
| Dec 24, 4:34 PM CST | Dense Fog Advisory | DMX | 43 hr |
| Dec 26, 4:44 PM CST | Dense Fog Advisory | DMX | 40 hr |
| Dec 27, 2:36 PM CST | Winter Weather Advisory | DMX | 42 hr |
| Dec 27, 2:42 PM CST | Wind Advisory | DMX | 39 hr |
| Dec 27, 9:44 PM CST | Blizzard Warning | DMX | 35 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20242026
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.