Alert archive / Wisconsin / Clark County
Weather alerts in Clark County, Wisconsin, 2020
93 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Clark County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 93
- Warnings
- 19
- Watches
- 9
- Advisories
- 31
- Busiest month
- July24 alerts
- Busiest day
- July 14, 20206 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Clark County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 10 | 3 | 70% | 6 | 50% | 7 min |
| Flash flood warnings | 1 | 1 | 0% | 3 | 100% | 79 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS La Crosse, WI: tornado warnings | 8 | 3 | 63% | 11 | 55% | 9 min |
| NWS La Crosse, WI: severe thunderstorm warnings | 99 | 48 | 52% | 182 | 70% | 22 min |
| NWS La Crosse, WI: flash flood warnings | 12 | 9 | 25% | 34 | 85% | 127 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 8, 2:55 PM CST | Winter Weather Advisory | ARX | 27 hr |
| Jan 13, 2:04 PM CST | Winter Weather Advisory | ARX | 16 hr |
| Jan 15, 3:25 PM CST | Wind Chill Advisory | ARX | 18 hr |
| Jan 15, 3:25 PM CST | Winter Storm Watch | ARX | 21 hr |
| Jan 16, 12:42 PM CST | Winter Storm Warning | ARX | 53 hr |
| Jan 21, 7:22 PM CST | Winter Weather Advisory | ARX | 26 hr |
| Feb 7, 2:37 AM CST | Winter Storm Watch | ARX | 25 hr |
| Feb 8, 3:49 AM CST | Winter Storm Warning | ARX | 38 hr |
| Feb 9, 6:39 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 12, 4:11 AM CST | Wind Chill Advisory | ARX | 54 hr |
| Feb 16, 3:05 PM CST | Winter Weather Advisory | ARX | 33 hr |
| Apr 7, 3:31 AM CDT | Dense Fog Advisory | ARX | 6 hr |
| Apr 8, 12:48 AM CDT | Dense Fog Advisory | ARX | 8 hr |
| Apr 10, 3:09 PM CDT | Winter Storm Watch | ARX | 24 hr |
| Apr 11, 2:44 PM CDT | Winter Storm Warning | ARX | 39 hr |
| May 6, 1:50 PM CDT | Frost Advisory | ARX | 17 hr |
| May 7, 9:48 AM CDT | Freeze Watch | ARX | 17 hr |
| May 7, 9:48 AM CDT | Freeze Warning | ARX | 23 hr |
| May 8, 3:13 AM CDT | Freeze Warning | ARX | 29 hr |
| May 10, 2:51 AM CDT | Freeze Warning | ARX | 29 hr |
| May 11, 2:41 PM CDT | Freeze Warning | ARX | 17 hr |
| May 12, 2:10 PM CDT | Frost Advisory | ARX | 18 hr |
| May 26, 6:02 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 26, 7:44 PM CDT | Special Weather Statement | ARX | 31 min |
| May 26, 8:05 PM CDT | Special Weather Statement | ARX | 25 min |
| May 26, 8:17 PM CDT | Special Weather Statement | ARX | 28 min |
| May 28, 8:16 AM CDT | Areal Flood Advisory | ARX | 6 hr |
| May 30, 1:38 PM CDT | Frost Advisory | ARX | 18 hr |
| Jun 2, 5:11 PM CDT | Special Weather Statement | ARX | 49 min |
| Jun 2, 5:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 2, 5:35 PM CDT | Severe Thunderstorm Warning | ARX | 40 min |
| Jun 2, 6:09 PM CDT | Severe Thunderstorm Warning | ARX | 39 min |
| Jun 8, 3:21 AM CDT | Flash Flood Watch | ARX | 47 hr |
| Jun 11, 3:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 21, 3:22 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 21, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 21, 6:14 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 21, 6:54 PM CDT | Special Weather Statement | ARX | 51 min |
| Jun 21, 7:47 PM CDT | Special Weather Statement | ARX | 28 min |
| Jun 21, 9:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 6, 3:33 PM CDT | Special Weather Statement | ARX | 27 min |
| Jul 7, 3:38 PM CDT | Heat Advisory | ARX | 27 hr |
| Jul 7, 4:01 PM CDT | Special Weather Statement | ARX | 29 min |
| Jul 14, 9:07 AM CDT | Special Weather Statement | ARX | 38 min |
| Jul 14, 9:52 AM CDT | Areal Flood Advisory | ARX | 3 hr |
| Jul 14, 11:01 AM CDT | Flash Flood Warning | ARX | 3 hr |
| Jul 14, 4:11 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 14, 4:14 PM CDT | Severe Thunderstorm Warning | ARX | 61 min |
| Jul 14, 5:07 PM CDT | Severe Thunderstorm Warning | ARX | 68 min |
| Jul 16, 2:14 AM CDT | Dense Fog Advisory | ARX | 7 hr |
| Jul 17, 2:35 AM CDT | Heat Advisory | ARX | 41 hr |
| Jul 17, 9:03 PM CDT | Mesoscale Discussion | SPC | 117 min |
| Jul 17, 10:25 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 17, 11:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 18, 3:10 AM CDT | Special Weather Statement | ARX | 65 min |
| Jul 18, 4:02 AM CDT | Mesoscale Discussion | SPC | 88 min |
| Jul 18, 4:35 AM CDT | Special Weather Statement | ARX | 55 min |
| Jul 18, 9:44 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 19, 12:36 AM CDT | Severe Thunderstorm Warning | ARX | 40 min |
| Jul 19, 1:13 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 19, 1:22 AM CDT | Severe Thunderstorm Warning | ARX | 23 min |
| Jul 21, 1:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 6:13 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jul 25, 2:44 AM CDT | Heat Advisory | ARX | 17 hr |
| Aug 9, 12:30 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 9, 10:59 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 13, 7:30 AM CDT | Areal Flood Advisory | ARX | 3 hr |
| Aug 24, 4:56 PM CDT | Special Weather Statement | ARX | 79 min |
| Aug 24, 10:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 24, 11:19 PM CDT | Severe Thunderstorm Warning | ARX | 41 min |
| Aug 24, 11:59 PM CDT | Severe Thunderstorm Warning | ARX | 61 min |
| Aug 25, 12:59 AM CDT | Severe Thunderstorm Warning | ARX | 46 min |
| Aug 25, 1:59 AM CDT | Special Weather Statement | ARX | 46 min |
| Aug 25, 2:08 AM CDT | Severe Thunderstorm Warning | ARX | 37 min |
| Aug 28, 6:52 AM CDT | Special Weather Statement | ARX | 68 min |
| Aug 28, 6:59 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 28, 7:35 AM CDT | Special Weather Statement | ARX | 70 min |
| Sep 10, 2:24 PM CDT | Frost Advisory | ARX | 19 hr |
| Sep 17, 11:15 AM CDT | Frost Advisory | ARX | 21 hr |
| Sep 18, 1:37 PM CDT | Frost Advisory | ARX | 18 hr |
| Sep 25, 12:32 AM CDT | Dense Fog Advisory | ARX | 7 hr |
| Sep 26, 3:07 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Oct 1, 3:56 AM CDT | Frost Advisory | ARX | 28 hr |
| Oct 2, 2:08 PM CDT | Frost Advisory | ARX | 18 hr |
| Oct 3, 1:44 PM CDT | Frost Advisory | ARX | 18 hr |
| Oct 12, 4:34 AM CDT | Special Weather Statement | ARX | 41 min |
| Oct 19, 2:36 PM CDT | Winter Weather Advisory | ARX | 34 hr |
| Oct 20, 2:05 PM CDT | Winter Storm Warning | ARX | 11 hr |
| Oct 31, 11:48 PM CDT | Wind Advisory | ARX | 15 hr |
| Nov 14, 2:06 PM CST | Wind Advisory | ARX | 28 hr |
| Nov 24, 7:49 PM CST | Dense Fog Advisory | ARX | 12 hr |
| Dec 22, 9:09 PM CST | Winter Weather Advisory | ARX | 29 hr |
| Dec 28, 3:45 AM CST | Winter Weather Advisory | ARX | 53 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 10 |
| Severe Thunderstorm Watch | 4 |
| Mesoscale Discussion | 18 |
| Special Weather Statement | 16 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 1 |
| Frost Advisory | 9 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.