Alert archive / Wisconsin / Rock County
Weather alerts in Rock County, Wisconsin, 2020
107 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Rock County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 107
- Warnings
- 22
- Watches
- 16
- Advisories
- 36
- Busiest month
- August17 alerts
- Busiest day
- May 23, 20209 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 4 tornado warnings covering Rock County in 2020 had a tornado report inside them; 3 of 3 tornado reports fell inside a warning, on average 20 minutes after it went out.
Rock County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 2 | 50% | 3 | 100% | 20 min |
| Severe thunderstorm warnings | 10 | 7 | 30% | 7 | 100% | 20 min |
| Flash flood warnings | 2 | 1 | 50% | 1 | 100% | 63 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, 3:04 AM CST | Winter Storm Warning | MKX | 44 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 13, 2:29 PM CST | Wind Chill Advisory | MKX | 20 hr |
| Feb 16, 2:55 PM CST | Winter Weather Advisory | MKX | 33 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 9, 10:51 AM CDT | River Flood Watch | MKX | 35 hr |
| Mar 19, 10:51 AM CDT | River Flood Watch | MKX | 3 days |
| Mar 19, 10:51 AM CDT | River Flood Watch | MKX | 21 days |
| Mar 20, 10:47 AM CDT | River Flood Watch | MKX | 21 days |
| Mar 20, 12:06 PM CDT | River Flood Warning | MKX | 21 days |
| Mar 23, 5:17 AM CDT | Dense Fog Advisory | MKX | 5 hr |
| Mar 29, 10:07 AM CDT | River Flood Warning | MKX | 27 hr |
| Mar 29, 3:55 PM CDT | River Flood Watch | MKX | 5 hr |
| Apr 7, 3:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Apr 7, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 7, 5:07 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Apr 8, 12:30 AM CDT | Dense Fog Advisory | MKX | 10 hr |
| Apr 12, 2:34 PM CDT | Wind Advisory | MKX | 25 hr |
| Apr 20, 6:15 PM CDT | Special Weather Statement | MKX | 90 min |
| Apr 27, 11:19 PM CDT | Dense Fog Advisory | MKX | 11 hr |
| Apr 29, 2:47 AM CDT | Dense Fog Advisory | MKX | 7 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 | Frost Advisory | MKX | 17 hr |
| May 15, 4:06 AM CDT | Dense Fog Advisory | MKX | 5 hr |
| May 23, 12:33 PM CDT | Tornado Watch | SPC | 8 hr |
| May 23, 2:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| May 23, 3:23 PM CDT | Severe Thunderstorm Warning | MKX | 52 min |
| May 23, 4:04 PM CDT | Tornado Warning | MKX | 25 min |
| May 23, 4:28 PM CDT | Severe Thunderstorm Warning | MKX | 47 min |
| May 23, 4:50 PM CDT | Tornado Warning | MKX | 40 min |
| May 23, 5:12 PM CDT | Areal Flood Advisory | MKX | 28 min |
| May 23, 5:15 PM CDT | Tornado Warning | MKX | 31 min |
| May 23, 5:39 PM CDT | Flash Flood Warning | MKX | 3 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, 8:39 PM CDT | Special Weather Statement | MKX | 66 min |
| Jun 5, 12:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 9, 2:12 PM CDT | Wind Advisory | MKX | 14 hr |
| 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, 3:39 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 1:35 PM CDT | Severe Thunderstorm Warning | MKX | 40 min |
| Jun 29, 1:59 PM CDT | Special Weather Statement | MKX | 46 min |
| Jun 29, 2:33 PM CDT | Areal Flood Advisory | MKX | 117 min |
| Jun 29, 2:43 PM CDT | Special Weather Statement | MKX | 47 min |
| Jun 29, 3:22 PM CDT | Special Weather Statement | MKX | 53 min |
| Jun 29, 3:32 PM CDT | Flash Flood Warning | MKX | 3 hr |
| Jun 29, 4:10 PM CDT | Special Weather Statement | MKX | 65 min |
| Jul 7, 5:25 PM CDT | Special Weather Statement | MKX | 65 min |
| Jul 7, 6:06 PM CDT | Special Weather Statement | MKX | 54 min |
| Jul 7, 6:10 PM CDT | Areal Flood Advisory | MKX | 2 hr |
| 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, 5:39 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 9, 6:18 PM CDT | Areal Flood Advisory | MKX | 3 hr |
| Jul 9, 6:19 PM CDT | Special Weather Statement | MKX | 41 min |
| Jul 9, 6:31 PM CDT | Severe Thunderstorm Warning | MKX | 44 min |
| Jul 15, 1:43 AM CDT | Severe Thunderstorm Warning | MKX | 19 min |
| Jul 17, 2:54 AM CDT | Heat Advisory | MKX | 41 hr |
| Jul 18, 11:00 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 26, 2:37 AM CDT | Heat Advisory | MKX | 16 hr |
| Jul 26, 5:33 PM CDT | Mesoscale Discussion | SPC | 87 min |
| Jul 26, 6:39 PM CDT | Areal Flood Advisory | MKX | 74 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, 4:45 PM CDT | Special Weather Statement | MKX | 60 min |
| Aug 9, 5:24 PM CDT | Special Weather Statement | MKX | 36 min |
| Aug 10, 10:42 AM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 10, 11:26 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 10, 1:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Aug 10, 2:26 PM CDT | Tornado Warning | MKX | 17 min |
| Aug 10, 2:29 PM CDT | Severe Thunderstorm Warning | MKX | 61 min |
| Aug 10, 3:13 PM CDT | Areal Flood Advisory | MKX | 3 hr |
| Aug 10, 3:13 PM CDT | Severe Thunderstorm Warning | MKX | 47 min |
| Aug 10, 3:37 PM CDT | Special Weather Statement | MKX | 38 min |
| Aug 10, 4:34 PM CDT | Areal Flood Advisory | MKX | 3 hr |
| Aug 15, 9:34 AM CDT | Special Weather Statement | MKX | 41 min |
| Aug 24, 10:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 25, 12:29 AM CDT | Severe Thunderstorm Warning | MKX | 46 min |
| Aug 25, 1:16 AM CDT | Severe Thunderstorm Warning | MKX | 44 min |
| Oct 1, 3:29 AM CDT | Frost Advisory | MKX | 30 hr |
| Oct 4, 9:27 AM CDT | Frost Advisory | MKX | 23 hr |
| Oct 15, 2:56 AM CDT | Freeze Warning | MKX | 29 hr |
| Oct 16, 2:21 PM CDT | Wind Advisory | MKX | 29 hr |
| Oct 22, 4:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 22, 6:54 PM CDT | Dense Fog Advisory | MKX | 5 hr |
| Nov 1, 3:09 AM CST | Wind Advisory | MKX | 13 hr |
| Nov 10, 3:09 AM CST | Wind Advisory | MKX | 25 hr |
| Nov 10, 1:28 PM CST | Mesoscale Discussion | SPC | 92 min |
| Nov 10, 2:05 PM CST | Tornado Watch | SPC | 6 hr |
| Nov 10, 3:38 PM CST | Severe Thunderstorm Warning | MKX | 82 min |
| 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 28, 4:19 AM CST | Winter Storm Watch | MKX | 10 hr |
| Dec 28, 1:49 PM CST | Winter Storm Warning | MKX | 40 hr |
| Dec 29, 2:17 PM CST | Mesoscale Discussion | SPC | 4 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 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 19 |
| Special Weather Statement | 14 |
| Flooding | |
| Flash Flood Warning | 2 |
| River Flood Warning | 2 |
| River Flood Watch | 5 |
| Areal Flood Advisory | 7 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 4 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
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.