Alert archive / Iowa / Clay County
Weather alerts in Clay County, Iowa, 2019
147 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 147
- Warnings
- 54
- Watches
- 23
- Advisories
- 48
- Busiest month
- March23 alerts
- Busiest day
- March 13, 20197 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Clay County, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 11 | 8 | 27% | 12 | 100% | 14 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Sioux Falls, SD: tornado warnings | 37 | 10 | 73% | 26 | 50% | 7 min |
| NWS Sioux Falls, SD: severe thunderstorm warnings | 172 | 107 | 38% | 251 | 88% | 18 min |
| NWS Sioux Falls, SD: flash flood warnings | 32 | 19 | 41% | 26 | 81% | 73 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 7, 2:44 PM CST | Wind Advisory | FSD | 30 hr |
| Jan 16, 3:00 PM CST | Winter Weather Advisory | FSD | 57 hr |
| Jan 17, 2:29 PM CST | Winter Storm Warning | FSD | 34 hr |
| Jan 21, 3:26 AM CST | Winter Weather Advisory | FSD | 35 hr |
| Jan 23, 2:27 PM CST | Wind Chill Advisory | FSD | 43 hr |
| Jan 23, 2:27 PM CST | Winter Weather Advisory | FSD | 20 hr |
| Jan 26, 2:29 PM CST | Winter Weather Advisory | FSD | 46 hr |
| Jan 27, 3:34 AM CST | Wind Chill Watch | FSD | 24 hr |
| Jan 28, 3:34 AM CST | Wind Chill Warning | FSD | 3 days |
| Jan 28, 3:34 AM CST | Wind Chill Advisory | FSD | 35 hr |
| Jan 28, 3:34 AM CST | Wind Chill Advisory | FSD | 3 days |
| Feb 2, 10:28 PM CST | Dense Fog Advisory | FSD | 15 hr |
| Feb 3, 3:43 AM CST | Winter Weather Advisory | FSD | 26 hr |
| Feb 3, 2:39 PM CST | Dense Fog Advisory | FSD | 4 hr |
| Feb 5, 10:03 AM CST | Winter Weather Advisory | FSD | 8 hr |
| Feb 5, 3:25 PM CST | Winter Weather Advisory | FSD | 57 hr |
| Feb 6, 1:43 PM CST | Blizzard Warning | FSD | 34 hr |
| Feb 7, 3:19 AM CST | Wind Chill Warning | FSD | 33 hr |
| Feb 7, 3:19 AM CST | Wind Chill Advisory | FSD | 54 hr |
| Feb 9, 2:58 PM CST | Winter Weather Advisory | FSD | 21 hr |
| Feb 10, 2:54 PM CST | Winter Weather Advisory | FSD | 39 hr |
| Feb 12, 10:36 AM CST | Winter Weather Advisory | FSD | 10 hr |
| Feb 14, 3:40 AM CST | Wind Chill Advisory | FSD | 29 hr |
| Feb 14, 12:04 PM CST | Winter Weather Advisory | FSD | 6 hr |
| Feb 15, 2:55 PM CST | Winter Weather Advisory | FSD | 51 hr |
| Feb 18, 2:55 PM CST | Winter Storm Watch | FSD | 13 hr |
| Feb 19, 4:07 AM CST | Winter Storm Warning | FSD | 35 hr |
| Feb 22, 3:35 AM CST | Winter Storm Watch | FSD | 12 hr |
| Feb 22, 3:26 PM CST | Blizzard Warning | FSD | 51 hr |
| Feb 22, 3:26 PM CST | Winter Weather Advisory | FSD | 48 hr |
| Feb 23, 5:26 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 24, 2:53 PM CST | Wind Chill Advisory | FSD | 17 hr |
| Mar 2, 3:59 AM CST | Wind Chill Advisory | FSD | 56 hr |
| Mar 8, 3:16 PM CST | Winter Weather Advisory | FSD | 38 hr |
| Mar 9, 5:05 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Mar 11, 3:13 PM CDT | Flood Watch | FSD | 72 hr |
| Mar 12, 3:26 PM CDT | River Flood Watch | FSD | 22 days |
| Mar 12, 3:26 PM CDT | River Flood Watch | FSD | 23 days |
| Mar 12, 3:26 PM CDT | River Flood Watch | FSD | 23 days |
| Mar 12, 3:26 PM CDT | River Flood Watch | FSD | 23 days |
| Mar 12, 5:41 PM CDT | Dense Fog Advisory | FSD | 19 hr |
| Mar 13, 11:04 AM CDT | River Flood Warning | FSD | 11 days |
| Mar 13, 11:04 AM CDT | River Flood Warning | FSD | 18 days |
| Mar 13, 11:04 AM CDT | River Flood Warning | FSD | 21 days |
| Mar 13, 11:04 AM CDT | River Flood Warning | FSD | 21 days |
| Mar 13, 12:55 PM CDT | Areal Flood Warning | FSD | 12 hr |
| Mar 13, 4:06 PM CDT | Wind Advisory | FSD | 36 hr |
| Mar 13, 6:42 PM CDT | Dense Fog Advisory | FSD | 12 hr |
| Mar 13, 7:57 PM CDT | River Flood Warning | FSD | 21 days |
| Mar 13, 10:32 PM CDT | River Flood Warning | FSD | 21 days |
| Mar 14, 2:18 AM CDT | Areal Flood Warning | FSD | 18 hr |
| Mar 14, 8:54 PM CDT | Areal Flood Warning | FSD | 12 hr |
| Mar 15, 9:46 PM CDT | River Flood Warning | FSD | 21 days |
| Mar 17, 6:29 PM CDT | River Flood Warning | FSD | 21 days |
| Mar 18, 9:42 PM CDT | River Flood Warning | FSD | 21 days |
| Apr 4, 10:24 PM CDT | Dense Fog Advisory | FSD | 12 hr |
| Apr 6, 9:35 AM CDT | River Flood Warning | FSD | 69 hr |
| Apr 6, 9:35 AM CDT | River Flood Warning | FSD | 18 days |
| Apr 6, 9:35 AM CDT | River Flood Warning | FSD | 40 days |
| Apr 6, 9:35 AM CDT | River Flood Warning | FSD | 17 days |
| Apr 9, 10:41 AM CDT | River Flood Warning | FSD | 21 days |
| Apr 10, 3:24 PM CDT | Wind Advisory | FSD | 22 hr |
| Apr 26, 8:45 AM CDT | River Flood Warning | FSD | 11 days |
| Apr 26, 8:45 AM CDT | River Flood Warning | FSD | 11 days |
| Apr 26, 2:44 PM CDT | Winter Weather Advisory | FSD | 22 hr |
| Apr 27, 9:54 AM CDT | River Flood Warning | FSD | 3 days |
| May 8, 9:39 AM CDT | River Flood Warning | FSD | 21 days |
| May 8, 9:39 AM CDT | River Flood Warning | FSD | 21 days |
| May 20, 2:58 PM CDT | Wind Advisory | FSD | 32 hr |
| May 23, 7:58 AM CDT | River Flood Warning | FSD | 18 days |
| May 24, 8:57 AM CDT | River Flood Warning | FSD | 15 days |
| May 24, 8:57 AM CDT | River Flood Warning | FSD | 21 days |
| May 24, 8:57 AM CDT | River Flood Warning | FSD | 15 days |
| May 25, 10:47 AM CDT | River Flood Warning | FSD | 10 days |
| May 28, 12:31 PM CDT | River Flood Warning | FSD | 21 days |
| May 29, 5:24 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 4, 10:43 PM CDT | Severe Thunderstorm Warning | FSD | 32 min |
| Jun 15, 12:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 1:20 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 15, 3:50 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jun 16, 2:21 AM CDT | Dense Fog Advisory | FSD | 8 hr |
| Jun 27, 4:01 AM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 27, 8:46 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 27, 12:33 PM CDT | Severe Thunderstorm Warning | FSD | 42 min |
| Jun 28, 2:02 PM CDT | Heat Advisory | FSD | 31 hr |
| Jun 29, 3:18 PM CDT | Heat Advisory | FSD | 30 hr |
| Jul 1, 1:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jul 1, 3:14 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 1, 4:16 PM CDT | Flash Flood Watch | FSD | 9 hr |
| Jul 1, 5:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 3:38 PM CDT | Excessive Heat Watch | FSD | 50 hr |
| Jul 17, 4:07 AM CDT | Excessive Heat Warning | FSD | 66 hr |
| Jul 17, 4:14 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 17, 4:48 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 17, 7:27 AM CDT | Severe Thunderstorm Warning | FSD | 48 min |
| Jul 17, 9:09 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 17, 5:19 PM CDT | Heat Advisory | FSD | 28 hr |
| Jul 20, 5:51 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 20, 7:40 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 20, 9:02 AM CDT | Severe Thunderstorm Warning | FSD | 43 min |
| Jul 20, 9:37 AM CDT | Severe Thunderstorm Warning | FSD | 38 min |
| Jul 20, 9:40 AM CDT | Severe Thunderstorm Warning | FSD | 35 min |
| Aug 10, 3:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 2:21 AM CDT | Dense Fog Advisory | FSD | 7 hr |
| Aug 17, 10:16 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 17, 10:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 17, 10:46 PM CDT | Severe Thunderstorm Warning | FSD | 44 min |
| Aug 17, 11:17 PM CDT | Severe Thunderstorm Warning | FSD | 43 min |
| Aug 18, 12:00 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Aug 19, 11:05 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Aug 19, 11:56 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 20, 3:08 AM CDT | Mesoscale Discussion | SPC | 97 min |
| Sep 10, 8:33 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 11, 12:44 AM CDT | Severe Thunderstorm Warning | FSD | 46 min |
| Sep 11, 1:25 AM CDT | Severe Thunderstorm Warning | FSD | 65 min |
| Sep 11, 4:07 AM CDT | Flash Flood Watch | FSD | 26 hr |
| Sep 15, 3:19 AM CDT | Dense Fog Advisory | FSD | 9 hr |
| Sep 18, 10:27 PM CDT | Flash Flood Watch | FSD | 7 hr |
| Sep 18, 10:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 21, 1:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Sep 21, 4:34 PM CDT | Severe Thunderstorm Warning | FSD | 26 min |
| Sep 24, 3:13 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 24, 4:43 PM CDT | Tornado Watch | SPC | 7 hr |
| Sep 24, 6:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Sep 30, 3:19 AM CDT | Flash Flood Watch | FSD | 39 hr |
| Sep 30, 4:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 3, 10:26 AM CDT | River Flood Warning | FSD | 7 days |
| Oct 3, 10:26 AM CDT | River Flood Warning | FSD | 7 days |
| Oct 3, 3:19 PM CDT | Frost Advisory | FSD | 18 hr |
| Oct 6, 6:58 AM CDT | River Flood Warning | FSD | 61 hr |
| Oct 6, 7:45 AM CDT | River Flood Warning | FSD | 31 hr |
| Oct 12, 9:55 AM CDT | Wind Advisory | FSD | 9 hr |
| Oct 18, 3:25 AM CDT | Wind Advisory | FSD | 15 hr |
| Oct 20, 9:20 PM CDT | Wind Advisory | FSD | 43 hr |
| Oct 21, 4:03 AM CDT | High Wind Warning | FSD | 24 hr |
| Oct 21, 11:40 AM CDT | Wind Advisory | FSD | 4 hr |
| Nov 24, 2:01 PM CST | Winter Storm Watch | FSD | 25 hr |
| Nov 25, 4:05 AM CST | Winter Storm Warning | FSD | 56 hr |
| Nov 26, 5:23 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Nov 27, 5:56 PM CST | Winter Weather Advisory | FSD | 4 days |
| Nov 29, 11:52 AM CST | Winter Weather Advisory | FSD | 18 hr |
| Dec 8, 12:21 PM CST | Dense Fog Advisory | FSD | 15 hr |
| Dec 17, 1:48 AM CST | Dense Fog Advisory | FSD | 4 hr |
| Dec 24, 2:24 PM CST | Dense Fog Advisory | FSD | 34 hr |
| Dec 27, 3:18 PM CST | Winter Weather Advisory | FSD | 3 days |
| Dec 28, 10:10 AM CST | River Flood Warning | FSD | 5 days |
| Dec 28, 10:10 AM CST | River Flood Warning | FSD | 4 days |
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 archive20182020
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.