Alert archive / Iowa / Clayton County
Weather alerts in Clayton County, Iowa, 2023
85 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Clayton County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 85
- Warnings
- 16
- Watches
- 13
- Advisories
- 31
- Busiest month
- April19 alerts
- Busiest day
- March 31, 20237 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado reports fell inside a warning.
Clayton County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 1 | 0% | |||
| Severe thunderstorm warnings | 4 | 2 | 50% | 2 | 100% | 12 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS La Crosse, WI: tornado warnings | 1 | 0 | 100% | 1 | 0% | |
| NWS La Crosse, WI: severe thunderstorm warnings | 76 | 49 | 36% | 160 | 78% | 23 min |
| NWS La Crosse, WI: flash flood warnings | 2 | 1 | 50% | 1 | 100% | 152 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 1, 5:51 AM CST | Dense Fog Advisory | ARX | 3 hr |
| Jan 3, 6:22 PM CST | Dense Fog Advisory | ARX | 8 hr |
| Jan 8, 4:44 AM CST | Dense Fog Advisory | ARX | 7 hr |
| Jan 17, 2:35 AM CST | Winter Storm Watch | ARX | 25 hr |
| Jan 18, 3:18 AM CST | Winter Weather Advisory | ARX | 30 hr |
| Jan 24, 8:09 AM CST | Dense Fog Advisory | ARX | 4 hr |
| Jan 27, 2:58 AM CST | Winter Weather Advisory | ARX | 48 hr |
| Jan 29, 2:18 PM CST | Wind Chill Advisory | ARX | 20 hr |
| Jan 30, 1:52 PM CST | Wind Chill Advisory | ARX | 20 hr |
| Feb 2, 2:53 AM CST | Wind Chill Advisory | ARX | 32 hr |
| Feb 7, 2:25 PM CST | Winter Storm Watch | ARX | 24 hr |
| Feb 8, 10:29 AM CST | Winter Weather Advisory | ARX | 29 hr |
| Feb 8, 2:28 PM CST | Winter Storm Warning | ARX | 26 hr |
| Feb 15, 2:50 AM CST | Winter Storm Watch | ARX | 11 hr |
| Feb 15, 2:09 PM CST | Winter Weather Advisory | ARX | 28 hr |
| Feb 16, 8:02 AM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 19, 2:14 PM CST | Winter Storm Watch | ARX | 48 hr |
| Feb 21, 2:36 PM CST | Ice Storm Warning | ARX | 36 hr |
| Feb 22, 8:46 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 23, 2:14 AM CST | Winter Weather Advisory | ARX | 10 hr |
| Feb 27, 9:09 AM CST | River Flood Warning | ARX | 26 hr |
| Feb 27, 9:09 AM CST | River Flood Warning | ARX | 23 hr |
| Mar 6, 8:12 AM CST | Dense Fog Advisory | ARX | 3 hr |
| Mar 7, 2:47 PM CST | Winter Storm Watch | ARX | 24 hr |
| Mar 8, 2:22 PM CST | Winter Storm Warning | ARX | 40 hr |
| Mar 9, 8:42 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Mar 31, 11:24 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Mar 31, 11:46 AM CDT | Tornado Watch | SPC | 8 hr |
| Mar 31, 3:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Mar 31, 4:37 PM CDT | Special Weather Statement | ARX | 83 min |
| Mar 31, 5:18 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Mar 31, 5:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 31, 5:45 PM CDT | Severe Thunderstorm Warning | ARX | 17 min |
| Apr 4, 2:54 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 4, 5:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Apr 4, 6:34 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 4, 8:03 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Apr 4, 9:29 PM CDT | Special Weather Statement | ARX | 31 min |
| Apr 4, 9:45 PM CDT | Severe Thunderstorm Warning | ARX | 25 min |
| Apr 4, 10:41 PM CDT | Special Weather Statement | ARX | 49 min |
| Apr 4, 10:51 PM CDT | Severe Thunderstorm Warning | ARX | 39 min |
| Apr 4, 10:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Apr 4, 11:09 PM CDT | Severe Thunderstorm Warning | ARX | 51 min |
| Apr 12, 2:43 AM CDT | Red Flag Warning | ARX | 17 hr |
| Apr 12, 11:28 AM CDT | River Flood Watch | ARX | 70 hr |
| Apr 12, 2:32 PM CDT | Fire Weather Watch | ARX | 11 hr |
| Apr 13, 1:46 AM CDT | Red Flag Warning | ARX | 18 hr |
| Apr 13, 11:13 AM CDT | River Flood Watch | ARX | 71 hr |
| Apr 15, 9:52 AM CDT | River Flood Warning | ARX | 30 days |
| Apr 15, 2:55 PM CDT | Winter Weather Advisory | ARX | 43 hr |
| Apr 16, 10:05 AM CDT | River Flood Warning | ARX | 25 days |
| Apr 20, 12:42 AM CDT | Special Weather Statement | ARX | 93 min |
| May 1, 10:37 AM CDT | Wind Advisory | ARX | 8 hr |
| May 7, 2:52 AM CDT | Dense Fog Advisory | ARX | 8 hr |
| May 14, 1:18 PM CDT | Areal Flood Advisory | ARX | 3 hr |
| May 18, 2:18 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 24, 5:45 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jun 24, 6:28 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 14, 2:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 2:04 PM CDT | Heat Advisory | ARX | 30 hr |
| Jul 28, 3:28 AM CDT | Heat Advisory | ARX | 16 hr |
| Jul 28, 4:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 2, 9:32 PM CDT | Dense Fog Advisory | ARX | 11 hr |
| Aug 11, 3:05 AM CDT | Special Weather Statement | ARX | 55 min |
| Aug 11, 3:31 AM CDT | Special Weather Statement | ARX | 59 min |
| Aug 11, 6:42 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Aug 11, 9:08 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Aug 14, 2:01 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Aug 14, 5:51 PM CDT | Areal Flood Advisory | ARX | 3 hr |
| Aug 19, 2:43 AM CDT | Heat Advisory | ARX | 39 hr |
| Aug 20, 2:48 AM CDT | Excessive Heat Watch | ARX | 3 days |
| Aug 20, 2:12 PM CDT | Excessive Heat Warning | ARX | 4 days |
| Sep 16, 4:13 PM CDT | Special Weather Statement | ARX | 32 min |
| Sep 21, 5:24 AM CDT | Dense Fog Advisory | ARX | 4 hr |
| Sep 22, 3:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 8, 1:42 PM CDT | Frost Advisory | ARX | 19 hr |
| Oct 9, 2:19 PM CDT | Frost Advisory | ARX | 19 hr |
| Oct 10, 1:47 PM CDT | Frost Advisory | ARX | 19 hr |
| Oct 27, 2:49 AM CDT | Freeze Warning | ARX | 29 hr |
| Oct 29, 3:41 AM CDT | Freeze Warning | ARX | 28 hr |
| Nov 25, 10:03 PM CST | Winter Weather Advisory | ARX | 11 hr |
| Dec 16, 8:12 PM CST | Dense Fog Advisory | ARX | 10 hr |
| Dec 17, 1:47 PM CST | Wind Advisory | ARX | 16 hr |
| Dec 22, 3:00 PM CST | Dense Fog Advisory | ARX | 22 hr |
| Dec 30, 5:27 PM CST | Winter Weather Advisory | ARX | 16 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 archive20222024
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.