Alert archive / Iowa / Clayton County
Weather alerts in Clayton County, Iowa, 2010
150 weather alerts in 2010, 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 2010. Tap one for its archive.
- Alerts
- 150
- Warnings
- 34
- Watches
- 33
- Advisories
- 36
- Busiest month
- July37 alerts
- Busiest day
- April 6, 20109 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, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 7 | 6 | 14% | 3 | 67% | 19 min |
| Flash flood warnings | 8 | 4 | 50% | 1 | 100% | 13 min |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS La Crosse, WI: tornado warnings | 11 | 6 | 45% | 17 | 35% | 10 min |
| NWS La Crosse, WI: severe thunderstorm warnings | 114 | 81 | 29% | 225 | 71% | 23 min |
| NWS La Crosse, WI: flash flood warnings | 30 | 12 | 60% | 38 | 63% | 58 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, 3:23 PM CST | Wind Chill Advisory | ARX | 21 hr |
| Jan 3, 3:04 PM CST | Wind Chill Advisory | ARX | 21 hr |
| Jan 4, 3:00 PM CST | Wind Chill Advisory | ARX | 20 hr |
| Jan 5, 2:29 PM CST | Winter Storm Watch | ARX | 14 hr |
| Jan 6, 4:11 AM CST | Winter Storm Warning | ARX | 38 hr |
| Jan 7, 3:32 PM CST | Wind Chill Advisory | ARX | 20 hr |
| Jan 16, 10:45 PM CST | Dense Fog Advisory | ARX | 13 hr |
| Jan 17, 5:46 PM CST | Dense Fog Advisory | ARX | 45 hr |
| Jan 19, 3:42 PM CST | Freezing Rain Advisory | ARX | 47 hr |
| Jan 20, 10:34 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Jan 21, 6:22 PM CST | Freezing Rain Advisory | ARX | 6 hr |
| Feb 7, 3:13 PM CST | Winter Storm Watch | ARX | 13 hr |
| Feb 8, 3:50 AM CST | Winter Weather Advisory | ARX | 42 hr |
| Mar 7, 3:50 PM CST | Dense Fog Advisory | ARX | 20 hr |
| Mar 8, 9:24 PM CST | Dense Fog Advisory | ARX | 15 hr |
| Mar 10, 11:01 AM CST | Dense Fog Advisory | ARX | 22 hr |
| Mar 10, 7:54 PM CST | River Flood Warning | ARX | 4 days |
| Mar 10, 7:54 PM CST | River Flood Warning | ARX | 3 days |
| Mar 17, 3:54 AM CDT | Dense Fog Advisory | ARX | 8 hr |
| Apr 2, 11:35 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Apr 2, 12:59 PM CDT | Severe Thunderstorm Watch | SPC | 117 min |
| Apr 2, 1:31 PM CDT | Severe Thunderstorm Warning | ARX | 37 min |
| Apr 5, 9:37 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Apr 6, 4:05 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Apr 6, 3:09 PM CDT | Flood Watch | ARX | 13 hr |
| Apr 6, 4:51 PM CDT | Severe Thunderstorm Warning | ARX | 39 min |
| Apr 6, 4:55 PM CDT | Mesoscale Discussion | SPC | 65 min |
| Apr 6, 5:06 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 6, 5:32 PM CDT | Severe Thunderstorm Warning | ARX | 58 min |
| Apr 6, 6:31 PM CDT | Severe Thunderstorm Warning | ARX | 36 min |
| Apr 6, 6:44 PM CDT | Areal Flood Advisory | ARX | 5 hr |
| Apr 6, 7:36 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 6, 9:51 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 7, 1:16 AM CDT | Areal Flood Warning | ARX | 5 hr |
| Apr 27, 11:47 AM CDT | Frost Advisory | ARX | 20 hr |
| Apr 30, 12:01 PM CDT | Mesoscale Discussion | SPC | 29 min |
| Apr 30, 12:23 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 30, 1:05 PM CDT | Tornado Watch | SPC | 9 hr |
| May 4, 2:49 PM CDT | Mesoscale Discussion | SPC | 56 min |
| May 5, 9:41 AM CDT | Wind Advisory | ARX | 7 hr |
| May 7, 3:27 PM CDT | Freeze Watch | ARX | 12 hr |
| May 8, 3:36 AM CDT | Freeze Warning | ARX | 29 hr |
| May 13, 2:18 AM CDT | Flash Flood Warning | ARX | 4 hr |
| May 13, 6:40 AM CDT | River Flood Warning | ARX | 11 hr |
| May 22, 2:20 AM CDT | Dense Fog Advisory | ARX | 7 hr |
| May 25, 10:39 AM CDT | Areal Flood Advisory | ARX | 3 hr |
| May 25, 12:17 PM CDT | Flash Flood Warning | ARX | 80 min |
| May 25, 12:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 5, 2:31 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Jun 11, 5:01 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 17, 4:46 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jun 17, 5:50 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 17, 7:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 17, 9:55 PM CDT | Severe Thunderstorm Warning | ARX | 65 min |
| Jun 18, 10:41 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 3:56 PM CDT | Flash Flood Watch | ARX | 14 hr |
| Jun 22, 11:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 23, 1:29 AM CDT | Tornado Watch | SPC | 7 hr |
| Jun 23, 2:44 AM CDT | Severe Thunderstorm Warning | ARX | 61 min |
| Jun 25, 7:42 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 25, 11:16 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 26, 4:13 AM CDT | Flash Flood Watch | ARX | 27 hr |
| Jun 26, 7:56 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 26, 10:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 27, 1:16 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 27, 5:58 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 3, 3:18 PM CDT | Flash Flood Watch | ARX | 44 hr |
| Jul 7, 8:02 AM CDT | Flash Flood Watch | ARX | 20 hr |
| Jul 7, 8:46 AM CDT | Areal Flood Advisory | ARX | 5 hr |
| Jul 7, 2:39 PM CDT | River Flood Warning | ARX | 19 hr |
| Jul 7, 2:58 PM CDT | River Flood Warning | ARX | 23 hr |
| Jul 7, 8:55 PM CDT | Flash Flood Warning | ARX | 4 hr |
| Jul 14, 3:07 AM CDT | Heat Advisory | ARX | 16 hr |
| Jul 14, 10:29 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 11:43 AM CDT | Tornado Watch | SPC | 7 hr |
| Jul 14, 6:53 PM CDT | Tornado Watch | SPC | 8 hr |
| Jul 14, 9:25 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Jul 14, 11:47 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Jul 16, 4:41 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 16, 7:28 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 17, 3:57 AM CDT | Heat Advisory | ARX | 11 hr |
| Jul 17, 8:55 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 17, 11:59 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 18, 2:31 AM CDT | Mesoscale Discussion | SPC | 59 min |
| Jul 22, 3:17 AM CDT | Flash Flood Watch | ARX | 21 hr |
| Jul 22, 3:01 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Jul 22, 3:50 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 22, 4:42 PM CDT | Flash Flood Warning | ARX | 3 hr |
| Jul 22, 6:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 9:04 PM CDT | Flash Flood Warning | ARX | 6 hr |
| Jul 23, 1:23 AM CDT | Mesoscale Discussion | SPC | 52 min |
| Jul 23, 2:59 AM CDT | Flash Flood Warning | ARX | 5 hr |
| Jul 23, 3:26 AM CDT | River Flood Warning | ARX | 14 hr |
| Jul 23, 3:26 AM CDT | River Flood Warning | ARX | 62 hr |
| Jul 23, 3:51 AM CDT | Flash Flood Watch | ARX | 26 hr |
| Jul 23, 7:57 AM CDT | Areal Flood Warning | ARX | 6 hr |
| Jul 23, 11:08 PM CDT | Flash Flood Warning | ARX | 3 hr |
| Jul 23, 11:16 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 23, 11:31 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 24, 1:59 AM CDT | Flash Flood Warning | ARX | 6 hr |
| Jul 24, 7:21 AM CDT | Areal Flood Warning | ARX | 7 hr |
| Jul 27, 1:25 PM CDT | Heat Advisory | ARX | 6 hr |
| Jul 28, 2:06 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 31, 9:30 PM CDT | Dense Fog Advisory | ARX | 12 hr |
| Aug 8, 9:40 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Aug 8, 10:08 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 8, 11:19 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 8, 11:43 PM CDT | Severe Thunderstorm Warning | ARX | 51 min |
| Aug 9, 2:20 AM CDT | Mesoscale Discussion | SPC | 100 min |
| Aug 10, 6:28 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 10, 9:01 PM CDT | Flash Flood Watch | ARX | 6 hr |
| Aug 11, 2:23 PM CDT | Heat Advisory | ARX | 6 hr |
| Aug 12, 3:54 AM CDT | Heat Advisory | ARX | 15 hr |
| Aug 13, 1:51 AM CDT | Flash Flood Watch | ARX | 22 hr |
| Aug 13, 3:55 AM CDT | Heat Advisory | ARX | 15 hr |
| Aug 13, 4:20 AM CDT | Mesoscale Discussion | SPC | 115 min |
| Aug 13, 10:36 AM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 13, 12:04 PM CDT | Mesoscale Discussion | SPC | 56 min |
| Aug 13, 2:39 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 21, 8:56 PM CDT | Dense Fog Advisory | ARX | 13 hr |
| Aug 31, 8:11 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Aug 31, 9:46 PM CDT | Mesoscale Discussion | SPC | 59 min |
| Aug 31, 11:16 PM CDT | Areal Flood Advisory | ARX | 104 min |
| Sep 2, 2:34 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Sep 6, 3:22 PM CDT | Wind Advisory | ARX | 25 hr |
| Sep 6, 5:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Sep 6, 7:50 PM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Sep 15, 6:07 PM CDT | Mesoscale Discussion | SPC | 53 min |
| Sep 24, 12:44 PM CDT | River Flood Warning | ARX | 16 days |
| Sep 24, 12:44 PM CDT | River Flood Warning | ARX | 15 days |
| Oct 2, 3:27 AM CDT | Frost Advisory | ARX | 30 hr |
| Oct 24, 3:22 PM CDT | High Wind Watch | ARX | 24 hr |
| Oct 25, 3:27 PM CDT | High Wind Warning | ARX | 52 hr |
| Oct 25, 9:36 PM CDT | Mesoscale Discussion | SPC | 24 min |
| Oct 25, 10:03 PM CDT | Tornado Watch | SPC | 9 hr |
| Oct 26, 2:21 AM CDT | Mesoscale Discussion | SPC | 114 min |
| Dec 2, 3:21 AM CST | Winter Storm Watch | ARX | 24 hr |
| Dec 3, 3:48 AM CST | Winter Storm Warning | ARX | 38 hr |
| Dec 3, 5:50 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Dec 9, 3:50 PM CST | Winter Storm Watch | ARX | 24 hr |
| Dec 10, 4:16 AM CST | Winter Storm Warning | ARX | 54 hr |
| Dec 10, 3:57 PM CST | Winter Weather Advisory | ARX | 26 hr |
| Dec 10, 11:08 PM CST | Blizzard Warning | ARX | 35 hr |
| Dec 11, 6:49 PM CST | Mesoscale Discussion | SPC | 5 hr |
| Dec 12, 10:01 AM CST | Wind Chill Advisory | ARX | 25 hr |
| Dec 15, 3:17 AM CST | Winter Weather Advisory | ARX | 36 hr |
| Dec 19, 3:42 PM CST | Winter Weather Advisory | ARX | 44 hr |
| Dec 23, 3:32 AM CST | Winter Weather Advisory | ARX | 38 hr |
| Dec 24, 6:24 AM CST | Winter Storm Warning | ARX | 12 hr |
| Dec 29, 11:04 AM CST | Dense Fog Advisory | ARX | 39 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 archive20092011
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.