Alert archive / Iowa / Clayton County
Weather alerts in Clayton County, Iowa, 2016
142 weather alerts in 2016, 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 2016. Tap one for its archive.
- Alerts
- 142
- Warnings
- 36
- Watches
- 22
- Advisories
- 36
- Busiest month
- September29 alerts
- Busiest day
- September 22, 20169 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Clayton County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 5 | 4 | 20% | 7 | 86% | 18 min |
| Flash flood warnings | 6 | 4 | 33% | 3 | 100% | 258 min |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS La Crosse, WI: tornado warnings | 11 | 2 | 82% | 6 | 50% | 8 min |
| NWS La Crosse, WI: severe thunderstorm warnings | 92 | 59 | 36% | 240 | 76% | 24 min |
| NWS La Crosse, WI: flash flood warnings | 59 | 42 | 29% | 188 | 88% | 122 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, 4:22 AM CST | Freezing Rain Advisory | ARX | 7 hr |
| Jan 8, 5:17 AM CST | Dense Fog Advisory | ARX | 16 hr |
| Jan 9, 3:25 AM CST | Wind Chill Advisory | ARX | 35 hr |
| Jan 11, 3:01 AM CST | Wind Chill Advisory | ARX | 33 hr |
| Jan 11, 9:58 PM CST | Winter Weather Advisory | ARX | 6 hr |
| Jan 16, 4:12 AM CST | Wind Chill Advisory | ARX | 56 hr |
| Jan 24, 3:03 PM CST | Winter Weather Advisory | ARX | 39 hr |
| Jan 31, 3:44 AM CST | Winter Storm Watch | ARX | 24 hr |
| Feb 1, 4:07 AM CST | Winter Storm Warning | ARX | 50 hr |
| Feb 1, 3:21 PM CST | Dense Fog Advisory | ARX | 12 hr |
| Feb 2, 3:38 PM CST | Winter Weather Advisory | ARX | 17 hr |
| Feb 7, 4:13 AM CST | Winter Weather Advisory | ARX | 35 hr |
| Feb 12, 3:09 AM CST | Wind Chill Advisory | ARX | 30 hr |
| Feb 13, 3:29 AM CST | Winter Weather Advisory | ARX | 36 hr |
| Feb 15, 4:53 AM CST | Dense Fog Advisory | ARX | 5 hr |
| Feb 18, 3:10 PM CST | Wind Advisory | ARX | 27 hr |
| Feb 19, 9:36 AM CST | High Wind Warning | ARX | 5 hr |
| Feb 29, 3:34 AM CST | Winter Weather Advisory | ARX | 29 hr |
| Feb 29, 8:49 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Mar 15, 3:32 AM CDT | High Wind Watch | ARX | 11 hr |
| Mar 15, 2:58 PM CDT | High Wind Warning | ARX | 28 hr |
| Mar 16, 9:06 PM CDT | Special Weather Statement | ARX | 39 min |
| Mar 19, 10:13 AM CDT | River Flood Warning | ARX | 7 days |
| Mar 19, 10:13 AM CDT | River Flood Warning | ARX | 6 days |
| Mar 23, 4:04 AM CDT | Winter Weather Advisory | ARX | 31 hr |
| Apr 1, 2:48 PM CDT | Wind Advisory | ARX | 25 hr |
| May 3, 10:13 PM CDT | Severe Thunderstorm Warning | ARX | 27 min |
| May 12, 12:55 AM CDT | Dense Fog Advisory | ARX | 4 hr |
| May 14, 3:15 AM CDT | Frost Advisory | ARX | 29 hr |
| May 26, 4:40 AM CDT | Special Weather Statement | ARX | 65 min |
| May 26, 4:52 AM CDT | Severe Thunderstorm Warning | ARX | 53 min |
| May 28, 12:37 PM CDT | Mesoscale Discussion | SPC | 113 min |
| May 28, 1:37 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 28, 5:33 PM CDT | Mesoscale Discussion | SPC | 57 min |
| May 29, 4:53 PM CDT | Special Weather Statement | ARX | 37 min |
| Jun 1, 3:37 AM CDT | Dense Fog Advisory | ARX | 4 hr |
| Jun 10, 7:35 PM CDT | Special Weather Statement | ARX | 85 min |
| Jun 10, 7:53 PM CDT | Special Weather Statement | ARX | 82 min |
| Jun 10, 8:33 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jun 10, 10:40 PM CDT | Special Weather Statement | ARX | 65 min |
| Jun 13, 6:48 PM CDT | Areal Flood Advisory | ARX | 117 min |
| Jun 13, 7:32 PM CDT | Special Weather Statement | ARX | 58 min |
| Jun 14, 10:41 AM CDT | Flash Flood Watch | ARX | 12 hr |
| Jun 14, 3:35 PM CDT | Severe Thunderstorm Warning | ARX | 25 min |
| Jun 14, 3:49 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Jun 14, 4:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 14, 6:24 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Jun 14, 6:26 PM CDT | Flash Flood Warning | ARX | 3 hr |
| Jun 14, 8:36 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jun 15, 12:05 AM CDT | River Flood Warning | ARX | 42 hr |
| Jun 17, 6:04 AM CDT | Special Weather Statement | ARX | 86 min |
| Jun 21, 3:50 PM CDT | Flash Flood Watch | ARX | 17 hr |
| Jun 22, 3:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 22, 9:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jun 26, 1:26 AM CDT | Special Weather Statement | ARX | 64 min |
| Jun 30, 1:29 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 5, 6:05 PM CDT | Special Weather Statement | ARX | 55 min |
| Jul 5, 8:38 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jul 5, 9:50 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 5, 10:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 7, 12:30 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 10, 9:25 AM CDT | Special Weather Statement | ARX | 95 min |
| Jul 17, 12:51 AM CDT | Flash Flood Watch | ARX | 6 hr |
| Jul 17, 4:25 AM CDT | Special Weather Statement | ARX | 80 min |
| Jul 17, 11:36 AM CDT | Special Weather Statement | ARX | 54 min |
| Jul 18, 3:03 PM CDT | Excessive Heat Watch | ARX | 44 hr |
| Jul 19, 4:00 AM CDT | Flash Flood Watch | ARX | 24 hr |
| Jul 20, 11:32 AM CDT | Excessive Heat Warning | ARX | 55 hr |
| Jul 21, 11:08 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jul 23, 8:58 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 12:03 PM CDT | Flash Flood Warning | ARX | 6 hr |
| Jul 23, 2:08 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 2:50 PM CDT | Mesoscale Discussion | SPC | 25 min |
| Jul 23, 2:57 PM CDT | Flash Flood Warning | ARX | 3 hr |
| Jul 23, 3:23 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 24, 10:07 AM CDT | River Flood Warning | ARX | 57 hr |
| Aug 4, 12:15 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 4, 4:44 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 4, 4:48 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Aug 4, 5:47 PM CDT | Special Weather Statement | ARX | 118 min |
| Aug 4, 6:44 PM CDT | Special Weather Statement | ARX | 91 min |
| Aug 4, 6:46 PM CDT | Severe Thunderstorm Warning | ARX | 44 min |
| Aug 4, 7:17 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Aug 11, 4:05 AM CDT | Flash Flood Watch | ARX | 24 hr |
| Aug 11, 6:03 AM CDT | Special Weather Statement | ARX | 87 min |
| Aug 11, 9:32 AM CDT | River Flood Watch | ARX | 19 hr |
| Aug 11, 9:32 AM CDT | River Flood Watch | ARX | 19 hr |
| Aug 17, 3:32 AM CDT | Special Weather Statement | ARX | 58 min |
| Aug 18, 7:00 AM CDT | Dense Fog Advisory | ARX | 2 hr |
| Aug 18, 2:46 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 18, 6:25 PM CDT | Special Weather Statement | ARX | 50 min |
| Aug 18, 7:13 PM CDT | Special Weather Statement | ARX | 62 min |
| Aug 18, 7:41 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Aug 18, 7:49 PM CDT | Special Weather Statement | ARX | 41 min |
| Aug 23, 9:10 PM CDT | Areal Flood Advisory | ARX | 3 hr |
| Aug 24, 8:59 AM CDT | River Flood Warning | ARX | 4 days |
| Aug 24, 8:59 AM CDT | River Flood Warning | ARX | 3 days |
| Aug 28, 3:33 AM CDT | Dense Fog Advisory | ARX | 6 hr |
| Sep 5, 3:20 PM CDT | Flood Watch | ARX | 52 hr |
| Sep 9, 11:41 AM CDT | Flash Flood Watch | ARX | 7 hr |
| Sep 9, 2:39 PM CDT | River Flood Warning | ARX | 4 days |
| Sep 9, 2:39 PM CDT | River Flood Warning | ARX | 64 hr |
| Sep 16, 5:01 AM CDT | River Flood Warning | ARX | 3 days |
| Sep 16, 5:01 AM CDT | River Flood Warning | ARX | 62 hr |
| Sep 19, 2:26 PM CDT | Special Weather Statement | ARX | 64 min |
| Sep 19, 2:31 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Sep 19, 2:56 PM CDT | Severe Thunderstorm Warning | ARX | 34 min |
| Sep 19, 5:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Sep 20, 1:42 AM CDT | Dense Fog Advisory | ARX | 8 hr |
| Sep 20, 10:21 AM CDT | Flash Flood Watch | ARX | 67 hr |
| Sep 20, 9:34 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 20, 11:26 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 21, 2:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 21, 6:01 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 21, 9:19 PM CDT | Special Weather Statement | ARX | 56 min |
| Sep 21, 10:13 PM CDT | Special Weather Statement | ARX | 62 min |
| Sep 22, 4:09 AM CDT | Flash Flood Warning | ARX | 6 hr |
| Sep 22, 9:00 AM CDT | River Flood Warning | ARX | 5 days |
| Sep 22, 9:00 AM CDT | River Flood Warning | ARX | 4 days |
| Sep 22, 10:19 AM CDT | Flash Flood Warning | ARX | 3 hr |
| Sep 22, 11:20 AM CDT | River Flood Warning | ARX | 10 days |
| Sep 22, 11:20 AM CDT | River Flood Warning | ARX | 9 days |
| Sep 22, 12:58 PM CDT | Areal Flood Warning | ARX | 21 hr |
| Sep 23, 12:00 AM CDT | Flash Flood Warning | ARX | 5 hr |
| Sep 23, 10:01 AM CDT | Areal Flood Warning | ARX | 12 hr |
| Sep 23, 9:59 PM CDT | Areal Flood Warning | ARX | 12 hr |
| Sep 24, 2:22 PM CDT | Flash Flood Watch | ARX | 17 hr |
| Oct 12, 3:24 AM CDT | Freeze Warning | ARX | 30 hr |
| Oct 20, 3:17 PM CDT | Frost Advisory | ARX | 17 hr |
| Nov 17, 3:07 PM CST | Wind Advisory | ARX | 45 hr |
| Dec 3, 2:39 PM CST | Winter Weather Advisory | ARX | 27 hr |
| Dec 5, 9:04 AM CST | Dense Fog Advisory | ARX | 3 hr |
| Dec 9, 11:13 AM CST | Winter Weather Advisory | ARX | 54 hr |
| Dec 10, 1:55 PM CST | Winter Storm Warning | ARX | 24 hr |
| Dec 14, 3:30 AM CST | Wind Chill Advisory | ARX | 30 hr |
| Dec 15, 4:02 AM CST | Winter Storm Warning | ARX | 62 hr |
| Dec 16, 2:59 PM CST | Wind Chill Warning | ARX | 45 hr |
| Dec 17, 9:56 AM CST | Wind Chill Advisory | ARX | 47 hr |
| Dec 22, 2:12 PM CST | Winter Weather Advisory | ARX | 31 hr |
| Dec 24, 3:39 AM CST | Freezing Rain Advisory | ARX | 43 hr |
| Dec 25, 3:49 PM CST | Wind Advisory | ARX | 26 hr |
| Dec 29, 2:48 AM CST | Wind Advisory | ARX | 14 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 archive20152017
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.