Alert archive / Iowa / Clayton County
Weather alerts in Clayton County, Iowa, 2015
91 weather alerts in 2015, 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 2015. Tap one for its archive.
- Alerts
- 91
- Warnings
- 19
- Watches
- 10
- Advisories
- 29
- Busiest month
- June19 alerts
- Busiest day
- June 22, 20159 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 warnings covering Clayton County in 2015 had a tornado report inside them.
Clayton County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 6 | 6 | 0% | 5 | 60% | 16 min |
| Flash flood warnings | 1 | 1 | 0% | 1 | 100% | 10 min |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS La Crosse, WI: tornado warnings | 4 | 0 | 100% | 4 | 0% | |
| NWS La Crosse, WI: severe thunderstorm warnings | 47 | 33 | 30% | 124 | 83% | 23 min |
| NWS La Crosse, WI: flash flood warnings | 9 | 5 | 44% | 20 | 75% | 74 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 3, 3:10 PM CST | Winter Storm Watch | ARX | 37 hr |
| Jan 4, 3:56 AM CST | Wind Chill Advisory | ARX | 32 hr |
| Jan 4, 3:12 PM CST | Winter Storm Warning | ARX | 32 hr |
| Jan 6, 3:47 AM CST | Wind Chill Warning | ARX | 32 hr |
| Jan 7, 11:46 AM CST | Wind Chill Advisory | ARX | 21 hr |
| Jan 8, 4:49 AM CST | Winter Weather Advisory | ARX | 28 hr |
| Jan 8, 8:00 PM CST | Wind Chill Advisory | ARX | 37 hr |
| Jan 31, 3:45 AM CST | Winter Weather Advisory | ARX | 41 hr |
| Jan 31, 12:52 PM CST | Winter Storm Warning | ARX | 32 hr |
| Feb 3, 3:21 AM CST | Winter Weather Advisory | ARX | 16 hr |
| Feb 8, 3:48 AM CST | Freezing Rain Advisory | ARX | 6 hr |
| Feb 13, 3:07 PM CST | Wind Chill Advisory | ARX | 39 hr |
| Feb 17, 3:00 AM CST | Wind Chill Advisory | ARX | 33 hr |
| Feb 18, 11:45 AM CST | Wind Chill Advisory | ARX | 24 hr |
| Feb 22, 3:38 AM CST | Wind Chill Advisory | ARX | 30 hr |
| Feb 25, 3:21 AM CST | Winter Weather Advisory | ARX | 16 hr |
| Feb 26, 9:50 PM CST | Wind Chill Advisory | ARX | 11 hr |
| Feb 27, 3:28 PM CST | Wind Chill Advisory | ARX | 18 hr |
| Mar 2, 4:14 AM CST | Winter Weather Advisory | ARX | 34 hr |
| Mar 10, 5:31 AM CDT | Dense Fog Advisory | ARX | 6 hr |
| Mar 21, 3:33 PM CDT | Winter Weather Advisory | ARX | 39 hr |
| Mar 22, 2:50 PM CDT | Winter Storm Warning | ARX | 16 hr |
| Mar 23, 12:47 AM CDT | Mesoscale Discussion | SPC | 4 hr |
| Mar 24, 4:08 AM CDT | Winter Weather Advisory | ARX | 26 hr |
| Apr 1, 4:26 AM CDT | Red Flag Warning | ARX | 15 hr |
| Apr 7, 6:40 PM CDT | Special Weather Statement | ARX | 95 min |
| Apr 7, 6:49 PM CDT | Special Weather Statement | ARX | 86 min |
| Apr 9, 5:22 PM CDT | Special Weather Statement | ARX | 23 min |
| Apr 9, 5:29 PM CDT | Severe Thunderstorm Warning | ARX | 30 min |
| Apr 21, 3:44 AM CDT | Wind Advisory | ARX | 14 hr |
| May 3, 9:41 PM CDT | Special Weather Statement | ARX | 109 min |
| May 6, 12:50 AM CDT | Dense Fog Advisory | ARX | 8 hr |
| May 26, 7:36 AM CDT | Special Weather Statement | ARX | 114 min |
| May 29, 4:51 PM CDT | Special Weather Statement | ARX | 54 min |
| May 29, 5:56 PM CDT | Special Weather Statement | ARX | 2 hr |
| Jun 7, 3:21 AM CDT | Special Weather Statement | ARX | 114 min |
| Jun 10, 1:46 PM CDT | Flash Flood Watch | ARX | 32 hr |
| Jun 20, 7:41 AM CDT | Special Weather Statement | ARX | 94 min |
| Jun 20, 12:48 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 21, 2:00 AM CDT | Dense Fog Advisory | ARX | 7 hr |
| Jun 22, 3:10 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Jun 22, 4:53 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 6:03 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 22, 6:54 AM CDT | Severe Thunderstorm Warning | ARX | 66 min |
| Jun 22, 7:42 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 22, 7:55 AM CDT | Special Weather Statement | ARX | 80 min |
| Jun 22, 7:58 AM CDT | Severe Thunderstorm Warning | ARX | 62 min |
| Jun 22, 8:15 AM CDT | Flash Flood Warning | ARX | 3 hr |
| Jun 22, 8:40 AM CDT | Severe Thunderstorm Warning | ARX | 50 min |
| Jun 29, 1:57 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 29, 6:40 PM CDT | Severe Thunderstorm Warning | ARX | 50 min |
| Jun 29, 7:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Jun 29, 7:44 PM CDT | Special Weather Statement | ARX | 61 min |
| Jun 29, 8:18 PM CDT | Areal Flood Advisory | ARX | 3 hr |
| Jul 12, 9:59 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 12, 11:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 13, 2:00 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 13, 3:03 AM CDT | Special Weather Statement | ARX | 117 min |
| Jul 18, 12:03 PM CDT | Tornado Warning | ARX | 27 min |
| Jul 18, 12:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Aug 18, 12:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Aug 18, 1:35 PM CDT | Tornado Watch | SPC | 8 hr |
| Aug 18, 1:53 PM CDT | Special Weather Statement | ARX | 67 min |
| Aug 22, 6:12 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Sep 6, 11:41 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Sep 8, 2:43 AM CDT | Flash Flood Watch | ARX | 7 hr |
| Sep 10, 8:05 AM CDT | Special Weather Statement | ARX | 40 min |
| Sep 10, 5:18 PM CDT | Special Weather Statement | ARX | 27 min |
| Sep 17, 2:30 PM CDT | Special Weather Statement | ARX | 60 min |
| Oct 16, 3:04 AM CDT | Freeze Warning | ARX | 30 hr |
| Oct 18, 2:02 PM CDT | Red Flag Warning | ARX | 29 hr |
| Nov 10, 3:23 PM CST | Wind Advisory | ARX | 51 hr |
| Nov 11, 4:59 PM CST | Mesoscale Discussion | SPC | 91 min |
| Nov 11, 5:25 PM CST | Special Weather Statement | ARX | 65 min |
| Nov 11, 6:21 PM CST | Special Weather Statement | ARX | 24 min |
| Nov 11, 6:30 PM CST | Severe Thunderstorm Warning | ARX | 45 min |
| Nov 18, 3:00 PM CST | Wind Advisory | ARX | 27 hr |
| Nov 19, 3:16 AM CST | Winter Storm Watch | ARX | 25 hr |
| Nov 19, 3:39 PM CST | Winter Storm Warning | ARX | 41 hr |
| Nov 20, 7:33 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Nov 29, 2:42 PM CST | Winter Weather Advisory | ARX | 37 hr |
| Dec 12, 5:00 AM CST | Dense Fog Advisory | ARX | 7 hr |
| Dec 13, 3:08 AM CST | Areal Flood Advisory | ARX | 4 hr |
| Dec 13, 4:07 AM CST | Flood Watch | ARX | 32 hr |
| Dec 13, 10:54 AM CST | River Flood Warning | ARX | 71 hr |
| Dec 13, 7:28 PM CST | River Flood Warning | ARX | 67 hr |
| Dec 21, 4:30 AM CST | Dense Fog Advisory | ARX | 6 hr |
| Dec 21, 8:59 PM CST | Dense Fog Advisory | ARX | 7 hr |
| Dec 26, 3:25 PM CST | Winter Storm Watch | ARX | 24 hr |
| Dec 27, 3:17 PM CST | Winter Storm Warning | ARX | 39 hr |
| Dec 28, 12:13 PM CST | Mesoscale Discussion | SPC | 5 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 archive20142016
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.