Alert archive / Iowa / Clay County
Weather alerts in Clay County, Iowa, 2026
114 weather alerts in 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Clay County and its neighbors
Each county as a circle sized by its count in 2026. Tap one for its archive.
- Alerts
- 114
- Warnings
- 37
- Watches
- 23
- Advisories
- 27
- Busiest month
- May24 alerts
- Busiest day
- May 18, 20266 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
4 of 4 tornado warnings covering Clay County in 2026 had a tornado report inside them; 2 of 4 tornado reports fell inside a warning, on average 6 minutes after it went out.
Clay County, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 4 | 0% | 4 | 50% | 6 min |
| Severe thunderstorm warnings | 19 | 11 | 42% | 10 | 100% | 25 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Sioux Falls, SD: tornado warnings | 40 | 13 | 68% | 23 | 65% | 12 min |
| NWS Sioux Falls, SD: severe thunderstorm warnings | 292 | 194 | 34% | 549 | 89% | 21 min |
| NWS Sioux Falls, SD: flash flood warnings | 16 | 4 | 75% | 5 | 80% | 12 min |
An office's figures cover every county it serves, including across state lines.
The year is still running; reports filed late and damage surveys can still change these figures.
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 15, 1:59 PM CST | Winter Weather Advisory | FSD | 34 hr |
| Jan 17, 2:21 PM CST | Winter Weather Advisory | FSD | 34 hr |
| Jan 18, 2:22 AM CST | Cold Weather Advisory | FSD | 32 hr |
| Jan 20, 1:23 PM CST | Extreme Cold Watch | FSD | 37 hr |
| Jan 20, 1:23 PM CST | Wind Advisory | FSD | 21 hr |
| Jan 20, 1:23 PM CST | Winter Weather Advisory | FSD | 29 hr |
| Jan 21, 10:13 AM CST | Blizzard Warning | FSD | 8 hr |
| Jan 22, 2:28 AM CST | Extreme Cold Warning | FSD | 33 hr |
| Jan 23, 2:17 AM CST | Cold Weather Advisory | FSD | 31 hr |
| Jan 25, 2:13 AM CST | Cold Weather Advisory | FSD | 32 hr |
| Feb 17, 2:43 AM CST | Wind Advisory | FSD | 36 hr |
| Feb 17, 2:38 PM CST | Fire Weather Watch | FSD | 7 hr |
| Feb 17, 5:22 PM CST | Mesoscale Discussion | SPC | 53 min |
| Feb 17, 10:06 PM CST | Red Flag Warning | FSD | 20 hr |
| Feb 18, 12:59 PM CST | Winter Weather Advisory | FSD | 35 hr |
| Feb 26, 2:41 AM CST | Dense Fog Advisory | FSD | 7 hr |
| Feb 26, 9:28 PM CST | Red Flag Warning | FSD | 21 hr |
| Mar 3, 11:43 PM CST | Dense Fog Advisory | FSD | 8 hr |
| Mar 4, 8:30 AM CST | Dense Fog Advisory | FSD | 3 hr |
| Mar 5, 1:55 PM CST | Winter Weather Advisory | FSD | 41 hr |
| Mar 10, 11:57 PM CDT | High Wind Watch | FSD | 21 hr |
| Mar 11, 12:01 AM CDT | Fire Weather Watch | FSD | 21 hr |
| Mar 11, 1:59 PM CDT | High Wind Warning | FSD | 41 hr |
| Mar 11, 8:50 PM CDT | Red Flag Warning | FSD | 23 hr |
| Mar 12, 2:35 PM CDT | Winter Storm Watch | FSD | 47 hr |
| Mar 13, 9:20 PM CDT | Blizzard Warning | FSD | 56 hr |
| Mar 14, 1:11 PM CDT | High Wind Warning | FSD | 36 hr |
| Mar 15, 9:49 AM CDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 15, 2:31 PM CDT | Cold Weather Advisory | FSD | 20 hr |
| Mar 26, 1:57 PM CDT | Fire Weather Watch | FSD | 21 hr |
| Mar 27, 11:17 AM CDT | Red Flag Warning | FSD | 34 hr |
| Apr 13, 4:39 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 13, 6:53 PM CDT | Severe Thunderstorm Warning | FSD | 52 min |
| Apr 13, 7:36 PM CDT | Severe Thunderstorm Warning | FSD | 36 min |
| Apr 13, 7:43 PM CDT | Tornado Warning | FSD | 32 min |
| Apr 23, 11:13 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 23, 12:02 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 23, 2:37 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Apr 23, 3:37 PM CDT | Severe Thunderstorm Warning | FSD | 38 min |
| Apr 30, 1:36 PM CDT | Frost Advisory | FSD | 18 hr |
| May 1, 1:06 PM CDT | Freeze Warning | FSD | 19 hr |
| May 5, 1:19 PM CDT | Frost Advisory | FSD | 18 hr |
| May 10, 1:08 PM CDT | Frost Advisory | FSD | 19 hr |
| May 11, 3:07 PM CDT | Red Flag Warning | FSD | 30 hr |
| May 13, 1:54 PM CDT | Red Flag Warning | FSD | 30 hr |
| May 15, 3:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 5:16 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 15, 5:23 PM CDT | Severe Thunderstorm Warning | FSD | 9 min |
| May 15, 6:47 PM CDT | Severe Thunderstorm Warning | FSD | 43 min |
| May 15, 7:18 PM CDT | Severe Thunderstorm Warning | FSD | 42 min |
| May 15, 7:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 15, 8:13 PM CDT | Severe Thunderstorm Warning | FSD | 35 min |
| May 16, 11:14 PM CDT | Severe Thunderstorm Warning | FSD | 16 min |
| May 17, 1:42 PM CDT | Tornado Watch | SPC | 8 hr |
| May 17, 5:45 PM CDT | Mesoscale Discussion | SPC | 60 min |
| May 17, 8:18 PM CDT | Mesoscale Discussion | SPC | 27 min |
| May 17, 8:21 PM CDT | Severe Thunderstorm Warning | FSD | 54 min |
| May 17, 8:26 PM CDT | Tornado Warning | FSD | 28 min |
| May 17, 8:48 PM CDT | Tornado Warning | FSD | 27 min |
| May 17, 8:54 PM CDT | Tornado Warning | FSD | 51 min |
| May 18, 5:48 PM CDT | Severe Thunderstorm Warning | FSD | 42 min |
| May 19, 2:43 AM CDT | Frost Advisory | FSD | 29 hr |
| May 24, 6:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| May 25, 7:13 PM CDT | Mesoscale Discussion | SPC | 92 min |
| May 31, 9:38 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 31, 10:46 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 8, 2:01 PM CDT | Heat Advisory | FSD | 30 hr |
| Jun 9, 8:36 PM CDT | Tornado Watch | SPC | 5 hr |
| Jun 16, 12:40 PM CDT | Wind Advisory | FSD | 31 hr |
| Jun 16, 11:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 2:36 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 3:55 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 17, 5:54 PM CDT | Severe Thunderstorm Warning | FSD | 51 min |
| Jun 27, 12:59 AM CDT | Heat Advisory | FSD | 68 hr |
| Jun 28, 4:51 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 28, 5:58 AM CDT | Severe Thunderstorm Warning | FSD | 62 min |
| Jun 28, 6:30 AM CDT | Severe Thunderstorm Warning | FSD | 45 min |
| Jun 28, 7:13 AM CDT | Severe Thunderstorm Warning | FSD | 17 min |
| Jun 29, 12:42 AM CDT | Extreme Heat Warning | FSD | 20 hr |
| Jun 29, 8:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 29, 11:55 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 30, 1:42 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 30, 2:21 AM CDT | Severe Thunderstorm Warning | FSD | 54 min |
| Jul 1, 3:29 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 1, 6:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 1, 7:38 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 2, 1:17 PM CDT | Flood Watch | FSD | 16 hr |
| Jul 2, 5:52 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jul 2, 6:08 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 2, 8:47 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jul 2, 11:37 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 17, 1:31 AM CDT | Heat Advisory | FSD | 19 hr |
| Jul 19, 1:05 PM CDT | Heat Advisory | FSD | 31 hr |
| Jul 24, 11:23 AM CDT | Heat Advisory | FSD | 29 hr |
| Jul 24, 11:24 PM CDT | Extreme Heat Warning | FSD | 46 hr |
| Jul 25, 7:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 25, 7:58 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 25, 9:49 PM CDT | Severe Thunderstorm Warning | FSD | 41 min |
| Jul 25, 9:53 PM CDT | Severe Thunderstorm Warning | FSD | 37 min |
| Jul 25, 11:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 12:39 PM CDT | Heat Advisory | FSD | 31 hr |
| Aug 6, 12:55 AM CDT | Dense Fog Advisory | FSD | 9 hr |
| Aug 7, 1:16 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Aug 9, 2:49 AM CDT | Severe Thunderstorm Warning | FSD | 38 min |
| Aug 9, 3:34 AM CDT | Severe Thunderstorm Warning | FSD | 56 min |
| Aug 11, 1:15 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 4:13 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 18, 2:47 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Aug 18, 6:48 PM CDT | Severe Thunderstorm Watch | SPC | 114 min |
| Sep 1, 9:11 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 1, 9:50 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 3, 2:34 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Sep 6, 10:23 AM CDT | Flood Watch | FSD | 9 hr |
| Sep 8, 11:39 PM CDT | Dense Fog Advisory | FSD | 8 hr |
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 | 19 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 12 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 27 |
| Flooding | |
| Flood Watch | 2 |
| Winter | |
| Blizzard Warning | 2 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 5 |
| Heat | |
| Extreme Heat Warning | 2 |
| Heat Advisory | 6 |
| Cold | |
| Extreme Cold Warning | 1 |
| Freeze Warning | 1 |
| Extreme Cold Watch | 1 |
| Cold Weather Advisory | 4 |
| Frost Advisory | 4 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 1 |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 6 |
| Fire Weather Watch | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
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.