Alert archive / Wisconsin / Trempealeau County
Weather alerts in Trempealeau County, Wisconsin, 2011
113 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Trempealeau County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 113
- Warnings
- 22
- Watches
- 25
- Advisories
- 35
- Busiest month
- July37 alerts
- Busiest day
- July 18, 20117 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Trempealeau County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 11 | 11 | 0% | 8 | 63% | 21 min |
| Flash flood warnings | 1 | 1 | 0% | 2 | 50% | 29 min |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS La Crosse, WI: tornado warnings | 25 | 10 | 60% | 26 | 62% | 18 min |
| NWS La Crosse, WI: severe thunderstorm warnings | 107 | 83 | 22% | 276 | 76% | 24 min |
| NWS La Crosse, WI: flash flood warnings | 21 | 11 | 48% | 27 | 78% | 100 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 |
|---|---|---|---|
| Dec 31, 6:11 PM CST | Freezing Rain Advisory | ARX | 6 hr |
| Jan 16, 3:26 PM CST | Winter Weather Advisory | ARX | 27 hr |
| Jan 20, 3:29 AM CST | Wind Chill Advisory | ARX | 31 hr |
| Jan 28, 3:27 AM CST | Winter Weather Advisory | ARX | 24 hr |
| Jan 29, 7:42 PM CST | Winter Weather Advisory | ARX | 8 hr |
| Jan 30, 4:19 AM CST | Winter Weather Advisory | ARX | 47 hr |
| Feb 2, 3:35 PM CST | Wind Chill Advisory | ARX | 18 hr |
| Feb 7, 2:35 PM CST | Wind Chill Advisory | ARX | 21 hr |
| Feb 8, 3:17 PM CST | Wind Chill Advisory | ARX | 20 hr |
| Feb 10, 3:40 AM CST | Wind Chill Advisory | ARX | 6 hr |
| Feb 13, 4:02 AM CST | Wind Advisory | ARX | 26 hr |
| Feb 16, 9:24 AM CST | Dense Fog Advisory | ARX | 30 hr |
| Feb 18, 3:14 AM CST | Wind Advisory | ARX | 11 hr |
| Feb 18, 2:58 PM CST | Winter Storm Watch | ARX | 13 hr |
| Feb 19, 4:03 AM CST | Winter Storm Warning | ARX | 56 hr |
| Feb 20, 11:07 AM CST | Winter Weather Advisory | ARX | 37 hr |
| Mar 7, 3:53 AM CST | Winter Storm Watch | ARX | 32 hr |
| Mar 8, 11:40 AM CST | Winter Weather Advisory | ARX | 25 hr |
| Mar 10, 11:50 PM CST | Dense Fog Advisory | ARX | 9 hr |
| Mar 18, 10:45 AM CDT | River Flood Warning | ARX | 9 days |
| Mar 20, 7:14 PM CDT | Dense Fog Advisory | ARX | 8 hr |
| Mar 21, 10:51 AM CDT | Flood Watch | ARX | 41 hr |
| Mar 21, 11:02 AM CDT | River Flood Warning | ARX | 4 days |
| Mar 22, 12:01 PM CDT | River Flood Warning | ARX | 31 days |
| Mar 23, 9:13 AM CDT | Areal Flood Warning | ARX | 24 hr |
| Apr 9, 12:30 PM CDT | River Flood Warning | ARX | 5 days |
| Apr 9, 7:42 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 10, 1:26 AM CDT | Mesoscale Discussion | SPC | 64 min |
| Apr 10, 10:58 AM CDT | River Flood Warning | ARX | 57 hr |
| Apr 10, 1:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 10, 3:19 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 10, 4:24 PM CDT | Severe Thunderstorm Warning | ARX | 41 min |
| Apr 14, 3:05 PM CDT | Wind Advisory | ARX | 31 hr |
| Apr 18, 3:52 AM CDT | Winter Storm Watch | ARX | 18 hr |
| Apr 18, 9:49 PM CDT | Winter Storm Warning | ARX | 24 hr |
| Apr 18, 9:49 PM CDT | Winter Weather Advisory | ARX | 24 hr |
| May 10, 5:10 PM CDT | Mesoscale Discussion | SPC | 95 min |
| May 10, 8:45 PM CDT | Mesoscale Discussion | SPC | 90 min |
| May 12, 1:08 PM CDT | Mesoscale Discussion | SPC | 67 min |
| May 12, 1:41 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 15, 3:05 PM CDT | Frost Advisory | ARX | 16 hr |
| May 16, 3:19 PM CDT | Frost Advisory | ARX | 16 hr |
| May 22, 4:41 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 22, 12:07 PM CDT | Tornado Watch | SPC | 7 hr |
| May 22, 2:59 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 3, 3:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 3, 5:10 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 6, 2:09 AM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 6, 3:46 AM CDT | Severe Thunderstorm Warning | ARX | 59 min |
| Jun 6, 3:35 PM CDT | Heat Advisory | ARX | 28 hr |
| Jun 8, 2:02 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 11:45 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 21, 2:11 PM CDT | Tornado Watch | SPC | 7 hr |
| Jun 30, 3:52 AM CDT | Heat Advisory | ARX | 41 hr |
| Jul 1, 8:37 AM CDT | Excessive Heat Warning | ARX | 12 hr |
| Jul 1, 7:35 PM CDT | Mesoscale Discussion | SPC | 55 min |
| Jul 1, 8:07 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 1, 9:21 PM CDT | Severe Thunderstorm Warning | ARX | 39 min |
| Jul 1, 10:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 1, 10:17 PM CDT | Severe Thunderstorm Warning | ARX | 58 min |
| Jul 1, 11:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 10, 6:39 AM CDT | Mesoscale Discussion | SPC | 66 min |
| Jul 10, 7:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Jul 10, 9:53 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jul 10, 10:10 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 10, 11:45 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Jul 15, 3:57 AM CDT | Excessive Heat Watch | ARX | 36 hr |
| Jul 15, 11:20 AM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 16, 3:27 PM CDT | Excessive Heat Warning | ARX | 4 days |
| Jul 17, 1:50 PM CDT | Flash Flood Watch | ARX | 13 hr |
| Jul 18, 6:30 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 18, 8:05 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 18, 8:46 AM CDT | Flash Flood Warning | ARX | 4 hr |
| Jul 18, 9:01 AM CDT | Severe Thunderstorm Warning | ARX | 44 min |
| Jul 18, 9:38 AM CDT | Severe Thunderstorm Warning | ARX | 37 min |
| Jul 18, 2:26 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 18, 5:42 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jul 19, 9:07 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 19, 11:57 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Jul 19, 9:45 PM CDT | Severe Thunderstorm Warning | ARX | 60 min |
| Jul 23, 9:37 AM CDT | Mesoscale Discussion | SPC | 53 min |
| Jul 23, 10:14 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 23, 5:26 PM CDT | Mesoscale Discussion | SPC | 64 min |
| Jul 23, 6:36 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 23, 11:46 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 24, 12:37 AM CDT | Severe Thunderstorm Warning | ARX | 38 min |
| Jul 28, 2:47 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jul 28, 4:48 PM CDT | Areal Flood Advisory | ARX | 3 hr |
| Jul 29, 3:19 AM CDT | Dense Fog Advisory | ARX | 6 hr |
| Jul 30, 1:04 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 31, 2:23 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 3:39 AM CDT | Heat Advisory | ARX | 10 hr |
| Aug 1, 1:50 PM CDT | Mesoscale Discussion | SPC | 25 min |
| Aug 1, 2:04 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 1, 3:53 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Aug 19, 1:51 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Aug 23, 4:55 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 2, 3:48 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 2, 7:02 AM CDT | Severe Thunderstorm Warning | ARX | 58 min |
| Sep 2, 7:33 AM CDT | Severe Thunderstorm Warning | ARX | 42 min |
| Sep 14, 3:34 AM CDT | Frost Advisory | ARX | 28 hr |
| Sep 20, 3:45 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 28, 1:54 AM CDT | Dense Fog Advisory | ARX | 9 hr |
| Sep 28, 3:04 PM CDT | Wind Advisory | ARX | 32 hr |
| Sep 30, 3:27 AM CDT | Frost Advisory | ARX | 30 hr |
| Oct 20, 3:40 AM CDT | Freeze Warning | ARX | 29 hr |
| Nov 7, 3:35 PM CST | Winter Storm Watch | ARX | 23 hr |
| Nov 19, 3:30 PM CST | Winter Weather Advisory | ARX | 6 hr |
| Dec 2, 4:00 AM CST | Winter Storm Watch | ARX | 24 hr |
| Dec 3, 1:38 AM CST | Freezing Rain Advisory | ARX | 5 hr |
| Dec 3, 4:03 AM CST | Winter Weather Advisory | ARX | 24 hr |
| Dec 4, 6:24 PM CST | Freezing Rain Advisory | ARX | 5 hr |
| Dec 14, 3:03 PM CST | Dense Fog Advisory | ARX | 8 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 archive20102012
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.