Alert archive / Wisconsin / Columbia County
Weather alerts in Columbia County, Wisconsin, 2020
127 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Columbia County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 127
- Warnings
- 36
- Watches
- 10
- Advisories
- 37
- Busiest month
- August38 alerts
- Busiest day
- August 25, 202012 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 Columbia County in 2020 had a tornado report inside them.
Columbia County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 18 | 10 | 44% | 13 | 54% | 26 min |
| Flash flood warnings | 4 | 3 | 25% | 4 | 100% | 97 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Milwaukee, WI: tornado warnings | 13 | 3 | 77% | 5 | 80% | 16 min |
| NWS Milwaukee, WI: severe thunderstorm warnings | 92 | 54 | 41% | 214 | 78% | 26 min |
| NWS Milwaukee, WI: flash flood warnings | 11 | 8 | 27% | 21 | 86% | 104 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 9, 3:09 PM CST | Winter Storm Watch | MKX | 23 hr |
| Jan 10, 1:58 PM CST | Winter Weather Advisory | MKX | 33 hr |
| Jan 10, 5:50 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Jan 14, 2:02 PM CST | Winter Weather Advisory | MKX | 22 hr |
| Jan 16, 2:08 PM CST | Winter Weather Advisory | MKX | 52 hr |
| Jan 18, 3:10 PM CST | Wind Chill Advisory | MKX | 19 hr |
| Jan 24, 3:12 AM CST | Winter Weather Advisory | MKX | 33 hr |
| Feb 8, 3:27 AM CST | Winter Weather Advisory | MKX | 40 hr |
| Feb 8, 2:21 PM CST | Winter Storm Warning | MKX | 29 hr |
| Feb 9, 6:39 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 9, 10:56 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Feb 13, 2:29 PM CST | Wind Chill Advisory | MKX | 20 hr |
| Feb 16, 2:55 PM CST | Winter Weather Advisory | MKX | 33 hr |
| Feb 17, 3:27 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 23, 2:03 PM CST | Winter Storm Watch | MKX | 24 hr |
| Mar 5, 5:41 PM CST | Wind Advisory | MKX | 12 hr |
| Mar 20, 3:55 AM CDT | River Flood Warning | MKX | 5 days |
| Mar 27, 10:35 AM CDT | River Flood Watch | MKX | 11 hr |
| Mar 27, 9:56 PM CDT | River Flood Warning | MKX | 21 days |
| Apr 7, 3:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Apr 8, 12:30 AM CDT | Dense Fog Advisory | MKX | 10 hr |
| Apr 12, 5:09 AM CDT | Dense Fog Advisory | MKX | 6 hr |
| Apr 12, 2:34 PM CDT | Wind Advisory | MKX | 25 hr |
| Apr 20, 8:02 PM CDT | Special Weather Statement | MKX | 58 min |
| Apr 27, 11:19 PM CDT | Dense Fog Advisory | MKX | 11 hr |
| May 7, 9:17 AM CDT | Freeze Warning | MKX | 24 hr |
| May 7, 9:25 AM CDT | Freeze Watch | MKX | 18 hr |
| May 8, 3:53 AM CDT | Freeze Warning | MKX | 28 hr |
| May 10, 3:32 PM CDT | Frost Advisory | MKX | 16 hr |
| May 11, 2:52 PM CDT | Freeze Warning | MKX | 17 hr |
| May 15, 4:06 AM CDT | Dense Fog Advisory | MKX | 5 hr |
| Jun 2, 5:32 PM CDT | Mesoscale Discussion | SPC | 118 min |
| Jun 2, 5:48 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 2, 7:06 PM CDT | Severe Thunderstorm Warning | MKX | 54 min |
| Jun 2, 7:57 PM CDT | Severe Thunderstorm Warning | MKX | 63 min |
| Jun 2, 8:03 PM CDT | Severe Thunderstorm Warning | MKX | 57 min |
| Jun 9, 2:12 PM CDT | Wind Advisory | MKX | 14 hr |
| Jun 10, 4:19 PM CDT | Areal Flood Advisory | MKX | 116 min |
| Jun 11, 3:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 11, 3:56 PM CDT | Special Weather Statement | MKX | 64 min |
| Jun 26, 12:38 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 1:38 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 26, 4:24 PM CDT | Special Weather Statement | MKX | 51 min |
| Jun 26, 4:57 PM CDT | Special Weather Statement | MKX | 48 min |
| Jun 29, 12:45 PM CDT | Severe Thunderstorm Warning | MKX | 45 min |
| Jun 29, 1:28 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 6, 3:39 PM CDT | Special Weather Statement | MKX | 36 min |
| Jul 6, 9:50 PM CDT | Special Weather Statement | MKX | 40 min |
| Jul 7, 1:23 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 7, 3:04 PM CDT | Heat Advisory | MKX | 28 hr |
| Jul 9, 11:41 AM CDT | Special Weather Statement | MKX | 34 min |
| Jul 9, 12:22 PM CDT | Special Weather Statement | MKX | 53 min |
| Jul 9, 2:51 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 9, 3:39 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 9, 4:05 PM CDT | Areal Flood Advisory | MKX | 2 hr |
| Jul 9, 4:55 PM CDT | Severe Thunderstorm Warning | MKX | 50 min |
| Jul 9, 5:23 PM CDT | Severe Thunderstorm Warning | MKX | 40 min |
| Jul 9, 5:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 14, 9:59 PM CDT | Special Weather Statement | MKX | 61 min |
| Jul 17, 2:54 AM CDT | Heat Advisory | MKX | 41 hr |
| Jul 18, 9:35 AM CDT | Special Weather Statement | MKX | 55 min |
| Jul 19, 3:43 AM CDT | Severe Thunderstorm Warning | MKX | 47 min |
| Jul 19, 3:44 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Jul 19, 4:24 AM CDT | Severe Thunderstorm Warning | MKX | 51 min |
| Jul 19, 5:18 AM CDT | Special Weather Statement | MKX | 27 min |
| Jul 26, 2:37 AM CDT | Heat Advisory | MKX | 16 hr |
| Jul 26, 3:55 PM CDT | Special Weather Statement | MKX | 50 min |
| Jul 26, 4:25 PM CDT | Areal Flood Advisory | MKX | 3 hr |
| Jul 26, 5:02 PM CDT | Areal Flood Advisory | MKX | 3 hr |
| Jul 26, 5:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Aug 9, 1:30 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 9, 3:41 PM CDT | Special Weather Statement | MKX | 64 min |
| Aug 9, 4:23 PM CDT | Severe Thunderstorm Warning | MKX | 38 min |
| Aug 10, 6:42 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 12:44 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Aug 10, 12:58 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 15, 2:19 AM CDT | Special Weather Statement | MKX | 41 min |
| Aug 24, 10:44 PM CDT | Special Weather Statement | MKX | 46 min |
| Aug 24, 10:54 PM CDT | Severe Thunderstorm Warning | MKX | 36 min |
| Aug 24, 10:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 24, 11:02 PM CDT | Tornado Warning | MKX | 17 min |
| Aug 24, 11:23 PM CDT | Severe Thunderstorm Warning | MKX | 39 min |
| Aug 25, 12:27 AM CDT | Severe Thunderstorm Warning | MKX | 48 min |
| Aug 25, 1:07 AM CDT | Severe Thunderstorm Warning | MKX | 38 min |
| Aug 25, 7:04 AM CDT | Areal Flood Advisory | MKX | 4 hr |
| Aug 25, 7:11 AM CDT | Special Weather Statement | MKX | 64 min |
| Aug 25, 8:24 AM CDT | Special Weather Statement | MKX | 51 min |
| Aug 25, 8:44 AM CDT | Severe Thunderstorm Warning | MKX | 31 min |
| Aug 25, 9:15 AM CDT | Special Weather Statement | MKX | 45 min |
| Aug 27, 3:51 PM CDT | Severe Thunderstorm Warning | MKX | 39 min |
| Aug 27, 4:41 PM CDT | Severe Thunderstorm Warning | MKX | 34 min |
| Aug 27, 5:05 PM CDT | Flash Flood Warning | MKX | 6 hr |
| Aug 27, 5:13 PM CDT | Special Weather Statement | MKX | 62 min |
| Aug 27, 5:24 PM CDT | Severe Thunderstorm Warning | MKX | 34 min |
| Aug 27, 6:16 PM CDT | Special Weather Statement | MKX | 44 min |
| Aug 27, 6:21 PM CDT | Flash Flood Warning | MKX | 4 hr |
| Aug 27, 6:53 PM CDT | Flash Flood Watch | MKX | 19 hr |
| Aug 27, 6:54 PM CDT | Special Weather Statement | MKX | 66 min |
| Aug 27, 7:30 PM CDT | Severe Thunderstorm Warning | MKX | 45 min |
| Aug 27, 7:48 PM CDT | Flash Flood Warning | MKX | 3 hr |
| Aug 27, 8:07 PM CDT | Special Weather Statement | MKX | 53 min |
| Aug 27, 10:45 PM CDT | Special Weather Statement | MKX | 30 min |
| Aug 27, 10:50 PM CDT | Areal Flood Warning | MKX | 3 hr |
| Aug 27, 10:50 PM CDT | Areal Flood Warning | MKX | 3 hr |
| Aug 28, 4:45 AM CDT | Special Weather Statement | MKX | 45 min |
| Aug 28, 5:58 AM CDT | Areal Flood Advisory | MKX | 3 hr |
| Aug 28, 3:16 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Aug 28, 10:52 PM CDT | River Flood Warning | MKX | 11 hr |
| Oct 1, 3:29 AM CDT | Frost Advisory | MKX | 30 hr |
| Oct 3, 1:45 PM CDT | Frost Advisory | MKX | 18 hr |
| Oct 4, 9:27 AM CDT | Frost Advisory | MKX | 23 hr |
| Oct 12, 10:13 AM CDT | Special Weather Statement | MKX | 32 min |
| Oct 15, 2:56 AM CDT | Freeze Warning | MKX | 29 hr |
| Oct 22, 4:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 22, 8:38 PM CDT | Areal Flood Advisory | MKX | 9 hr |
| Oct 22, 10:02 PM CDT | Areal Flood Advisory | MKX | 7 hr |
| Oct 22, 11:01 PM CDT | Flash Flood Warning | MKX | 6 hr |
| Oct 23, 8:02 AM CDT | River Flood Warning | MKX | 8 hr |
| Oct 23, 8:31 AM CDT | River Flood Warning | MKX | 4 days |
| Nov 1, 3:09 AM CST | Wind Advisory | MKX | 13 hr |
| Nov 10, 3:09 AM CST | Wind Advisory | MKX | 25 hr |
| Nov 14, 1:08 PM CST | Wind Advisory | MKX | 32 hr |
| Nov 23, 1:44 PM CST | Winter Weather Advisory | MKX | 22 hr |
| Nov 24, 8:22 PM CST | Dense Fog Advisory | MKX | 14 hr |
| Dec 11, 3:21 AM CST | Winter Weather Advisory | MKX | 35 hr |
| Dec 27, 3:32 AM CST | Winter Weather Advisory | MKX | 17 hr |
| Dec 28, 1:49 PM CST | Winter Storm Warning | MKX | 40 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 | 18 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 5 |
| Mesoscale Discussion | 19 |
| Special Weather Statement | 25 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 4 |
| River Flood Warning | 5 |
| Flash Flood Watch | 1 |
| River Flood Watch | 1 |
| Areal Flood Advisory | 8 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 9 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 1 |
| Frost Advisory | 4 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 6 |
| 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.