Alert archive / Wisconsin / Trempealeau County
Weather alerts in Trempealeau County, Wisconsin, 2021
136 weather alerts in 2021, 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 2021. Tap one for its archive.
- Alerts
- 136
- Warnings
- 35
- Watches
- 17
- Advisories
- 32
- Busiest month
- June26 alerts
- Busiest day
- June 18, 202111 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 3 tornado warnings covering Trempealeau County in 2021 had a tornado report inside them; 3 of 3 tornado reports fell inside a warning, on average 16 minutes after it went out.
Trempealeau County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 1 | 67% | 3 | 100% | 16 min |
| Severe thunderstorm warnings | 23 | 14 | 39% | 26 | 77% | 24 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS La Crosse, WI: tornado warnings | 28 | 7 | 75% | 14 | 100% | 22 min |
| NWS La Crosse, WI: severe thunderstorm warnings | 117 | 58 | 50% | 269 | 75% | 30 min |
| NWS La Crosse, WI: flash flood warnings | 11 | 9 | 18% | 25 | 84% | 61 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 2, 1:55 PM CST | Dense Fog Advisory | ARX | 22 hr |
| Jan 3, 2:58 PM CST | Dense Fog Advisory | ARX | 24 hr |
| Jan 4, 8:47 PM CST | Dense Fog Advisory | ARX | 13 hr |
| Jan 5, 2:02 PM CST | Dense Fog Advisory | ARX | 19 hr |
| Jan 13, 10:56 AM CST | Winter Storm Watch | ARX | 10 hr |
| Jan 13, 2:42 PM CST | Winter Weather Advisory | ARX | 42 hr |
| Jan 16, 9:25 PM CST | Winter Weather Advisory | ARX | 15 hr |
| Jan 22, 2:15 PM CST | Winter Weather Advisory | ARX | 43 hr |
| Jan 29, 2:54 PM CST | Winter Weather Advisory | ARX | 45 hr |
| Feb 2, 2:29 PM CST | Winter Storm Watch | ARX | 23 hr |
| Feb 3, 1:53 PM CST | Winter Weather Advisory | ARX | 34 hr |
| Feb 5, 3:44 AM CST | Wind Chill Advisory | ARX | 3 days |
| Feb 8, 1:34 PM CST | Wind Chill Advisory | ARX | 20 hr |
| Feb 9, 2:45 PM CST | Wind Chill Advisory | ARX | 19 hr |
| Feb 10, 2:52 PM CST | Wind Chill Advisory | ARX | 19 hr |
| Feb 11, 2:20 PM CST | Wind Chill Advisory | ARX | 46 hr |
| Feb 13, 3:15 AM CST | Wind Chill Warning | ARX | 57 hr |
| Feb 14, 2:38 AM CST | Wind Chill Advisory | ARX | 33 hr |
| Feb 15, 11:53 AM CST | Wind Chill Advisory | ARX | 22 hr |
| Mar 10, 4:02 AM CST | Wind Advisory | ARX | 23 hr |
| Mar 10, 1:32 PM CST | Mesoscale Discussion | SPC | 118 min |
| Mar 10, 5:43 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 14, 4:06 AM CDT | Winter Weather Advisory | ARX | 42 hr |
| Mar 28, 1:57 PM CDT | Wind Advisory | ARX | 30 hr |
| Apr 27, 12:26 AM CDT | Severe Thunderstorm Warning | ARX | 49 min |
| Apr 27, 1:13 AM CDT | Severe Thunderstorm Warning | ARX | 47 min |
| Apr 27, 2:33 AM CDT | Special Weather Statement | ARX | 57 min |
| Apr 27, 5:20 PM CDT | Special Weather Statement | ARX | 55 min |
| Apr 27, 8:24 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 2, 4:56 PM CDT | Severe Thunderstorm Warning | ARX | 34 min |
| May 2, 5:28 PM CDT | Severe Thunderstorm Warning | ARX | 47 min |
| May 2, 5:44 PM CDT | Severe Thunderstorm Warning | ARX | 40 min |
| May 2, 5:59 PM CDT | Severe Thunderstorm Warning | ARX | 29 min |
| May 4, 3:00 AM CDT | Frost Advisory | ARX | 30 hr |
| May 7, 1:37 PM CDT | Freeze Warning | ARX | 18 hr |
| May 10, 1:52 PM CDT | Freeze Warning | ARX | 18 hr |
| May 11, 1:45 PM CDT | Frost Advisory | ARX | 18 hr |
| May 25, 2:15 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 2:53 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 25, 4:47 PM CDT | Special Weather Statement | ARX | 28 min |
| May 25, 4:50 PM CDT | Severe Thunderstorm Warning | ARX | 40 min |
| May 25, 5:17 PM CDT | Mesoscale Discussion | SPC | 118 min |
| May 28, 10:36 AM CDT | Frost Advisory | ARX | 20 hr |
| May 31, 5:33 PM CDT | Special Weather Statement | ARX | 27 min |
| Jun 8, 4:46 PM CDT | Special Weather Statement | ARX | 14 min |
| Jun 11, 11:34 AM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 11, 6:30 PM CDT | Special Weather Statement | ARX | 60 min |
| Jun 17, 3:34 AM CDT | Special Weather Statement | ARX | 56 min |
| Jun 17, 4:10 AM CDT | Severe Thunderstorm Warning | ARX | 17 min |
| Jun 17, 2:57 PM CDT | Mesoscale Discussion | SPC | 63 min |
| Jun 17, 3:50 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 17, 5:56 PM CDT | Special Weather Statement | ARX | 34 min |
| Jun 17, 6:20 PM CDT | Severe Thunderstorm Warning | ARX | 25 min |
| Jun 17, 6:50 PM CDT | Special Weather Statement | ARX | 25 min |
| Jun 17, 6:59 PM CDT | Severe Thunderstorm Warning | ARX | 46 min |
| Jun 17, 7:02 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jun 17, 8:52 PM CDT | Severe Thunderstorm Warning | ARX | 38 min |
| Jun 17, 8:56 PM CDT | Severe Thunderstorm Warning | ARX | 64 min |
| Jun 17, 9:01 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Jun 17, 9:23 PM CDT | Severe Thunderstorm Warning | ARX | 37 min |
| Jun 17, 9:58 PM CDT | Severe Thunderstorm Warning | ARX | 47 min |
| Jun 17, 10:01 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 17, 10:22 PM CDT | Severe Thunderstorm Warning | ARX | 53 min |
| Jun 17, 10:46 PM CDT | Severe Thunderstorm Warning | ARX | 44 min |
| Jun 17, 10:52 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Jun 17, 11:15 PM CDT | Areal Flood Advisory | ARX | 97 min |
| Jun 20, 1:42 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 24, 3:30 PM CDT | Special Weather Statement | ARX | 90 min |
| Jun 24, 6:09 PM CDT | Special Weather Statement | ARX | 51 min |
| Jun 24, 6:57 PM CDT | Special Weather Statement | ARX | 63 min |
| Jul 6, 1:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 6, 2:01 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 6, 3:33 PM CDT | Severe Thunderstorm Warning | ARX | 42 min |
| Jul 6, 5:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jul 6, 8:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 7:02 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 8:54 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 27, 7:01 AM CDT | Special Weather Statement | ARX | 59 min |
| Jul 27, 11:54 AM CDT | Severe Thunderstorm Warning | ARX | 51 min |
| Jul 27, 12:00 PM CDT | Severe Thunderstorm Warning | ARX | 45 min |
| Jul 27, 3:10 PM CDT | Heat Advisory | ARX | 30 hr |
| Jul 27, 7:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jul 27, 8:03 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 28, 7:17 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 28, 8:59 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Jul 28, 10:44 PM CDT | Severe Thunderstorm Warning | ARX | 46 min |
| Jul 28, 11:19 PM CDT | Severe Thunderstorm Warning | ARX | 26 min |
| Jul 28, 11:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 31, 1:27 AM CDT | Special Weather Statement | ARX | 3 hr |
| Jul 31, 1:06 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 7, 2:23 PM CDT | Areal Flood Advisory | ARX | 112 min |
| Aug 7, 3:02 PM CDT | River Flood Warning | ARX | 19 hr |
| Aug 7, 6:18 PM CDT | Flash Flood Watch | ARX | 35 hr |
| Aug 8, 9:11 PM CDT | River Flood Watch | ARX | 48 hr |
| Aug 10, 9:19 PM CDT | River Flood Warning | ARX | 30 hr |
| Aug 11, 7:27 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 23, 7:35 AM CDT | Special Weather Statement | ARX | 55 min |
| Aug 24, 6:00 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Aug 24, 6:11 AM CDT | Special Weather Statement | ARX | 94 min |
| Aug 24, 6:50 AM CDT | Severe Thunderstorm Warning | ARX | 40 min |
| Aug 24, 7:10 AM CDT | Mesoscale Discussion | SPC | 95 min |
| Aug 24, 8:41 AM CDT | Special Weather Statement | ARX | 49 min |
| Aug 26, 1:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 26, 1:40 PM CDT | Special Weather Statement | ARX | 80 min |
| Aug 27, 9:23 AM CDT | River Flood Watch | ARX | 18 hr |
| Aug 27, 4:24 PM CDT | Special Weather Statement | ARX | 51 min |
| Aug 28, 3:15 AM CDT | River Flood Warning | ARX | 5 days |
| Sep 11, 11:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Sep 20, 12:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 20, 2:07 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 20, 3:55 PM CDT | Mesoscale Discussion | SPC | 95 min |
| Sep 20, 5:38 PM CDT | Special Weather Statement | ARX | 37 min |
| Sep 20, 5:46 PM CDT | Tornado Warning | ARX | 29 min |
| Sep 20, 5:52 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Sep 20, 6:11 PM CDT | Tornado Warning | ARX | 19 min |
| Oct 8, 9:34 PM CDT | Dense Fog Advisory | ARX | 12 hr |
| Oct 20, 2:30 PM CDT | Special Weather Statement | ARX | 30 min |
| Oct 21, 3:07 AM CDT | Freeze Warning | ARX | 30 hr |
| Nov 13, 1:51 PM CST | Winter Weather Advisory | ARX | 16 hr |
| Dec 5, 3:03 AM CST | Wind Advisory | ARX | 30 hr |
| Dec 8, 2:41 AM CST | Winter Storm Watch | ARX | 35 hr |
| Dec 9, 11:41 AM CST | Winter Storm Warning | ARX | 45 hr |
| Dec 10, 3:31 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 10, 7:04 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 13, 3:25 AM CST | High Wind Watch | ARX | 35 hr |
| Dec 14, 2:46 PM CST | High Wind Warning | ARX | 39 hr |
| Dec 15, 3:48 AM CST | Dense Fog Advisory | ARX | 8 hr |
| Dec 15, 4:51 PM CST | Mesoscale Discussion | SPC | 114 min |
| Dec 15, 5:30 PM CST | Tornado Watch | SPC | 6 hr |
| Dec 15, 7:11 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Dec 15, 7:53 PM CST | Severe Thunderstorm Warning | ARX | 67 min |
| Dec 15, 7:58 PM CST | Tornado Warning | ARX | 47 min |
| Dec 24, 2:40 PM CST | Dense Fog Advisory | ARX | 9 hr |
| Dec 26, 2:27 AM CST | Winter Weather Advisory | ARX | 34 hr |
| Dec 26, 5:26 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 27, 2:38 PM CST | Winter Weather Advisory | ARX | 33 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 archive20202022
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.