Alert archive / Wisconsin / Clark County
Weather alerts in Clark County, Wisconsin, 2018
105 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 105
- Warnings
- 21
- Watches
- 19
- Advisories
- 25
- Busiest month
- June19 alerts
- Busiest day
- July 13, 20187 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 1 tornado warnings covering Clark County in 2018 had a tornado report inside them.
Clark County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 9 | 7 | 22% | 14 | 79% | 31 min |
| Flash flood warnings | 2 | 1 | 50% | 2 | 50% | 31 min |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS La Crosse, WI: tornado warnings | 11 | 0 | 100% | 4 | 0% | |
| NWS La Crosse, WI: severe thunderstorm warnings | 115 | 62 | 46% | 187 | 67% | 24 min |
| NWS La Crosse, WI: flash flood warnings | 28 | 18 | 36% | 53 | 81% | 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 |
|---|---|---|---|
| Jan 1, 12:11 PM CST | Wind Chill Advisory | ARX | 23 hr |
| Jan 3, 2:07 PM CST | Wind Chill Advisory | ARX | 17 hr |
| Jan 10, 2:07 PM CST | Winter Weather Advisory | ARX | 28 hr |
| Jan 12, 3:00 PM CST | Wind Chill Advisory | ARX | 18 hr |
| Jan 14, 3:51 AM CST | Winter Weather Advisory | ARX | 44 hr |
| Jan 19, 3:01 PM CST | Winter Storm Watch | ARX | 37 hr |
| Jan 21, 3:56 AM CST | Winter Storm Warning | ARX | 44 hr |
| Jan 22, 3:15 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Feb 1, 3:02 AM CST | Wind Chill Advisory | ARX | 9 hr |
| Feb 1, 2:15 PM CST | Wind Chill Advisory | ARX | 20 hr |
| Feb 3, 2:56 AM CST | Winter Weather Advisory | ARX | 19 hr |
| Feb 4, 2:46 PM CST | Wind Chill Advisory | ARX | 18 hr |
| Feb 18, 3:48 AM CST | Winter Storm Watch | ARX | 22 hr |
| Feb 18, 3:48 AM CST | Winter Weather Advisory | ARX | 58 hr |
| Feb 20, 2:43 AM CST | Mesoscale Discussion | SPC | 3 hr |
| Feb 22, 3:04 AM CST | Winter Weather Advisory | ARX | 30 hr |
| Feb 22, 3:17 PM CST | Winter Storm Watch | ARX | 23 hr |
| Feb 23, 2:38 PM CST | Winter Weather Advisory | ARX | 36 hr |
| Feb 24, 1:24 AM CST | Dense Fog Advisory | ARX | 8 hr |
| Mar 3, 2:18 PM CST | Winter Storm Watch | ARX | 25 hr |
| Mar 4, 3:15 PM CST | Winter Weather Advisory | ARX | 42 hr |
| Mar 30, 3:58 AM CDT | Winter Weather Advisory | ARX | 23 hr |
| Mar 30, 2:34 PM CDT | Winter Storm Warning | ARX | 21 hr |
| Apr 1, 2:53 PM CDT | Winter Storm Watch | ARX | 20 hr |
| Apr 2, 11:09 AM CDT | Winter Storm Warning | ARX | 41 hr |
| Apr 12, 3:37 PM CDT | Winter Storm Watch | ARX | 24 hr |
| Apr 13, 4:04 PM CDT | Winter Storm Warning | ARX | 54 hr |
| Apr 13, 4:04 PM CDT | Winter Weather Advisory | ARX | 51 hr |
| Apr 14, 6:02 PM CDT | Mesoscale Discussion | SPC | 6 hr |
| Apr 30, 9:57 AM CDT | Red Flag Warning | ARX | 9 hr |
| May 23, 3:21 AM CDT | Dense Fog Advisory | ARX | 6 hr |
| May 25, 12:59 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 2:02 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 25, 4:59 PM CDT | Severe Thunderstorm Warning | ARX | 46 min |
| May 25, 5:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| May 25, 6:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 28, 10:24 PM CDT | Special Weather Statement | ARX | 66 min |
| Jun 12, 6:56 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 15, 2:41 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 15, 4:20 AM CDT | Special Weather Statement | ARX | 25 min |
| Jun 15, 5:38 AM CDT | Severe Thunderstorm Warning | ARX | 52 min |
| Jun 15, 3:56 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 12:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jun 17, 2:14 PM CDT | Flash Flood Watch | ARX | 17 hr |
| Jun 17, 3:08 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 17, 3:46 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 17, 5:29 PM CDT | Severe Thunderstorm Warning | ARX | 46 min |
| Jun 17, 6:46 PM CDT | Severe Thunderstorm Warning | ARX | 59 min |
| Jun 17, 9:35 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Jun 18, 2:41 AM CDT | Special Weather Statement | ARX | 49 min |
| Jun 18, 4:37 AM CDT | Flash Flood Warning | ARX | 3 hr |
| Jun 18, 7:28 AM CDT | Areal Flood Warning | ARX | 6 hr |
| Jun 18, 1:36 PM CDT | Areal Flood Warning | ARX | 6 hr |
| Jun 28, 3:13 AM CDT | Heat Advisory | ARX | 64 hr |
| Jun 30, 1:39 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 30, 4:23 PM CDT | Mesoscale Discussion | SPC | 67 min |
| Jun 30, 8:05 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 4, 9:56 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 12, 5:04 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 12, 7:29 PM CDT | Special Weather Statement | ARX | 91 min |
| Jul 12, 7:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Jul 12, 7:38 PM CDT | Severe Thunderstorm Warning | ARX | 52 min |
| Jul 12, 7:43 PM CDT | Severe Thunderstorm Warning | ARX | 62 min |
| Jul 12, 8:32 PM CDT | Severe Thunderstorm Warning | ARX | 43 min |
| Jul 12, 8:39 PM CDT | Severe Thunderstorm Warning | ARX | 36 min |
| Jul 12, 9:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 14, 3:16 AM CDT | Dense Fog Advisory | ARX | 5 hr |
| Jul 25, 3:47 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Jul 25, 4:05 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 25, 6:29 PM CDT | Mesoscale Discussion | SPC | 91 min |
| Aug 1, 4:19 PM CDT | Special Weather Statement | ARX | 86 min |
| Aug 3, 11:34 AM CDT | Special Weather Statement | ARX | 86 min |
| Aug 8, 1:03 AM CDT | Dense Fog Advisory | ARX | 8 hr |
| Aug 26, 3:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 27, 4:25 AM CDT | Special Weather Statement | ARX | 20 min |
| Aug 27, 11:33 AM CDT | Flash Flood Watch | ARX | 33 hr |
| Aug 27, 2:24 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Aug 27, 2:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 27, 7:02 PM CDT | Special Weather Statement | ARX | 58 min |
| Sep 4, 4:00 AM CDT | Flash Flood Watch | ARX | 33 hr |
| Sep 4, 2:06 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 4, 3:01 PM CDT | Special Weather Statement | ARX | 89 min |
| Sep 4, 3:35 PM CDT | Tornado Watch | SPC | 7 hr |
| Sep 4, 6:19 PM CDT | Special Weather Statement | ARX | 86 min |
| Sep 4, 6:28 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 4, 7:51 PM CDT | Tornado Warning | ARX | 39 min |
| Sep 4, 9:07 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Sep 4, 9:21 PM CDT | Special Weather Statement | ARX | 54 min |
| Sep 4, 9:44 PM CDT | Flash Flood Warning | ARX | 5 hr |
| Sep 5, 2:49 AM CDT | Areal Flood Warning | ARX | 5 hr |
| Sep 20, 5:29 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 20, 6:23 PM CDT | Tornado Watch | SPC | 5 hr |
| Sep 20, 8:20 PM CDT | Mesoscale Discussion | SPC | 115 min |
| Sep 20, 8:37 PM CDT | Special Weather Statement | ARX | 68 min |
| Sep 20, 8:53 PM CDT | Severe Thunderstorm Warning | ARX | 40 min |
| Sep 21, 2:51 PM CDT | Frost Advisory | ARX | 17 hr |
| Sep 28, 3:40 AM CDT | Freeze Warning | ARX | 29 hr |
| Oct 3, 2:31 PM CDT | Mesoscale Discussion | SPC | 89 min |
| Oct 3, 3:31 PM CDT | Tornado Watch | SPC | 7 hr |
| Oct 3, 7:38 PM CDT | Special Weather Statement | ARX | 67 min |
| Oct 8, 3:13 AM CDT | Flood Watch | ARX | 56 hr |
| Nov 30, 2:40 PM CST | Winter Weather Advisory | ARX | 45 hr |
| Dec 11, 2:28 PM CST | Winter Weather Advisory | ARX | 22 hr |
| Dec 26, 3:47 AM CST | Winter Weather Advisory | ARX | 27 hr |
| Dec 28, 2:34 AM CST | Winter Weather Advisory | ARX | 9 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 | 9 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 27 |
| Special Weather Statement | 13 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 3 |
| Flood Watch | 1 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 6 |
| Winter Weather Advisory | 13 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 6 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.