Alert archive / Wisconsin / Clark County
Weather alerts in Clark County, Wisconsin, 2017
107 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 107
- Warnings
- 16
- Watches
- 10
- Advisories
- 32
- Busiest month
- May26 alerts
- Busiest day
- May 17, 201716 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 2 tornado warnings covering Clark County in 2017 had a tornado report inside them.
Clark County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 12 | 8 | 33% | 10 | 80% | 21 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS La Crosse, WI: tornado warnings | 22 | 4 | 82% | 14 | 36% | 8 min |
| NWS La Crosse, WI: severe thunderstorm warnings | 184 | 120 | 35% | 500 | 85% | 23 min |
| NWS La Crosse, WI: flash flood warnings | 20 | 13 | 35% | 58 | 78% | 196 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, 3:33 PM CST | Winter Weather Advisory | ARX | 38 hr |
| Jan 4, 2:17 PM CST | Wind Chill Advisory | ARX | 44 hr |
| Jan 6, 2:03 PM CST | Wind Chill Advisory | ARX | 20 hr |
| Jan 9, 3:30 AM CST | Winter Weather Advisory | ARX | 39 hr |
| Jan 10, 6:05 PM CST | Winter Weather Advisory | ARX | 3 hr |
| Jan 15, 10:59 AM CST | Winter Weather Advisory | ARX | 49 hr |
| Jan 19, 1:27 AM CST | Dense Fog Advisory | ARX | 11 hr |
| Jan 19, 3:28 PM CST | Freezing Rain Advisory | ARX | 21 hr |
| Jan 20, 3:09 PM CST | Dense Fog Advisory | ARX | 45 hr |
| Jan 23, 3:11 PM CST | Winter Weather Advisory | ARX | 57 hr |
| Jan 29, 2:57 PM CST | Winter Weather Advisory | ARX | 27 hr |
| Jan 30, 10:15 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Feb 6, 2:27 PM CST | Freezing Rain Advisory | ARX | 28 hr |
| Feb 21, 3:58 AM CST | Areal Flood Warning | ARX | 30 hr |
| Feb 22, 3:49 AM CST | Winter Storm Watch | ARX | 24 hr |
| Feb 23, 3:31 AM CST | Winter Storm Warning | ARX | 35 hr |
| Feb 23, 3:03 PM CST | Winter Weather Advisory | ARX | 39 hr |
| Feb 23, 11:54 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 28, 2:20 PM CST | Winter Weather Advisory | ARX | 28 hr |
| Mar 6, 3:59 AM CST | Wind Advisory | ARX | 41 hr |
| Mar 6, 7:00 PM CST | Mesoscale Discussion | SPC | 2 hr |
| Mar 6, 8:44 PM CST | Special Weather Statement | ARX | 46 min |
| Mar 8, 2:49 AM CST | Wind Advisory | ARX | 13 hr |
| Apr 9, 3:16 PM CDT | Mesoscale Discussion | SPC | 119 min |
| Apr 9, 8:06 PM CDT | Mesoscale Discussion | SPC | 54 min |
| Apr 9, 9:01 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 9, 11:12 PM CDT | Severe Thunderstorm Warning | ARX | 63 min |
| Apr 9, 11:32 PM CDT | Mesoscale Discussion | SPC | 58 min |
| Apr 9, 11:44 PM CDT | Severe Thunderstorm Warning | ARX | 60 min |
| Apr 9, 11:58 PM CDT | Severe Thunderstorm Warning | ARX | 47 min |
| Apr 10, 6:57 AM CDT | Special Weather Statement | ARX | 33 min |
| Apr 15, 8:23 AM CDT | Special Weather Statement | ARX | 22 min |
| Apr 15, 8:45 AM CDT | Special Weather Statement | ARX | 45 min |
| May 2, 3:46 AM CDT | Frost Advisory | ARX | 28 hr |
| May 6, 3:18 AM CDT | Frost Advisory | ARX | 28 hr |
| May 7, 10:09 AM CDT | Frost Advisory | ARX | 22 hr |
| May 16, 12:57 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 16, 1:12 PM CDT | Special Weather Statement | ARX | 63 min |
| May 16, 3:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 16, 4:02 PM CDT | Tornado Watch | SPC | 6 hr |
| May 16, 6:25 PM CDT | Mesoscale Discussion | SPC | 65 min |
| May 16, 8:47 PM CDT | Severe Thunderstorm Warning | ARX | 28 min |
| May 16, 9:14 PM CDT | Mesoscale Discussion | SPC | 61 min |
| May 16, 9:47 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 16, 9:57 PM CDT | Severe Thunderstorm Warning | ARX | 93 min |
| May 16, 11:48 PM CDT | Mesoscale Discussion | SPC | 117 min |
| May 17, 12:23 PM CDT | Mesoscale Discussion | SPC | 97 min |
| May 17, 12:54 PM CDT | Special Weather Statement | ARX | 51 min |
| May 17, 1:20 PM CDT | Special Weather Statement | ARX | 25 min |
| May 17, 1:42 PM CDT | Special Weather Statement | ARX | 63 min |
| May 17, 2:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| May 17, 3:13 PM CDT | Tornado Watch | SPC | 9 hr |
| May 17, 5:52 PM CDT | Severe Thunderstorm Warning | ARX | 38 min |
| May 17, 6:04 PM CDT | Tornado Warning | ARX | 23 min |
| May 17, 6:29 PM CDT | Severe Thunderstorm Warning | ARX | 31 min |
| May 17, 6:31 PM CDT | Mesoscale Discussion | SPC | 89 min |
| May 17, 6:39 PM CDT | Severe Thunderstorm Warning | ARX | 66 min |
| May 17, 9:06 PM CDT | Special Weather Statement | ARX | 54 min |
| May 18, 2:48 PM CDT | Frost Advisory | ARX | 17 hr |
| Jun 3, 2:48 PM CDT | Mesoscale Discussion | SPC | 57 min |
| Jun 3, 5:58 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 11, 6:28 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 11, 8:29 AM CDT | Special Weather Statement | ARX | 91 min |
| Jun 11, 9:30 AM CDT | Mesoscale Discussion | SPC | 60 min |
| Jun 11, 10:22 AM CDT | Severe Thunderstorm Warning | ARX | 68 min |
| Jun 11, 11:34 AM CDT | Special Weather Statement | ARX | 41 min |
| Jun 11, 12:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 11, 6:20 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 11, 7:40 PM CDT | Severe Thunderstorm Warning | ARX | 65 min |
| Jun 11, 8:01 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 11, 8:03 PM CDT | Severe Thunderstorm Warning | ARX | 42 min |
| Jun 11, 8:32 PM CDT | Tornado Warning | ARX | 13 min |
| Jun 11, 9:39 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 13, 9:25 AM CDT | Special Weather Statement | ARX | 35 min |
| Jun 16, 3:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Jun 16, 7:22 PM CDT | Severe Thunderstorm Warning | ARX | 68 min |
| Jun 17, 8:12 PM CDT | Special Weather Statement | ARX | 33 min |
| Jun 28, 2:49 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jun 28, 4:09 PM CDT | Tornado Watch | SPC | 6 hr |
| Jun 28, 4:44 PM CDT | Special Weather Statement | ARX | 61 min |
| Jun 28, 7:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jul 6, 10:19 PM CDT | Special Weather Statement | ARX | 41 min |
| Jul 12, 1:49 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 12, 3:56 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 12, 2:53 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jul 12, 3:33 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 12, 3:40 PM CDT | Special Weather Statement | ARX | 65 min |
| Jul 12, 4:42 PM CDT | Special Weather Statement | ARX | 63 min |
| Jul 15, 5:53 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 18, 2:19 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Jul 22, 3:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 4:44 PM CDT | Special Weather Statement | ARX | 76 min |
| Aug 1, 7:48 PM CDT | Special Weather Statement | ARX | 42 min |
| Aug 30, 2:03 PM CDT | Special Weather Statement | ARX | 57 min |
| Sep 2, 9:41 PM CDT | Dense Fog Advisory | ARX | 11 hr |
| Sep 12, 9:57 PM CDT | Special Weather Statement | ARX | 3 hr |
| Oct 13, 10:10 PM CDT | Dense Fog Advisory | ARX | 7 hr |
| Oct 15, 3:18 PM CDT | Frost Advisory | ARX | 18 hr |
| Oct 23, 11:20 AM CDT | Wind Advisory | ARX | 28 hr |
| Oct 31, 8:09 PM CDT | Winter Weather Advisory | ARX | 29 hr |
| Nov 2, 5:27 AM CDT | Dense Fog Advisory | ARX | 7 hr |
| Nov 3, 3:34 AM CDT | Winter Weather Advisory | ARX | 29 hr |
| Nov 11, 8:50 AM CST | Winter Weather Advisory | ARX | 3 hr |
| Dec 3, 2:48 PM CST | Wind Advisory | ARX | 51 hr |
| Dec 12, 1:49 PM CST | Winter Weather Advisory | ARX | 28 hr |
| Dec 24, 2:07 PM CST | Wind Chill Advisory | ARX | 70 hr |
| Dec 29, 3:26 PM CST | Wind Chill Advisory | ARX | 69 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 | 12 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 28 |
| Special Weather Statement | 21 |
| Flooding | |
| Areal Flood Warning | 1 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Freezing Rain Advisory | 2 |
| Winter Weather Advisory | 12 |
| Cold | |
| Frost Advisory | 5 |
| Wind Chill Advisory | 4 |
| Wind and dust | |
| Wind Advisory | 4 |
| 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 archive20162018
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.