Alert archive / Wisconsin / Pierce County
Weather alerts in Pierce County, Wisconsin, 2020
112 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Pierce County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 112
- Warnings
- 28
- Watches
- 15
- Advisories
- 25
- Busiest month
- June28 alerts
- Busiest day
- June 29, 202015 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 3 tornado warnings covering Pierce County in 2020 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 14 minutes after it went out.
Pierce County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 1 | 67% | 1 | 100% | 14 min |
| Severe thunderstorm warnings | 5 | 4 | 20% | 2 | 100% | 25 min |
| Flash flood warnings | 2 | 2 | 0% | 1 | 100% | 61 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Twin Cities, MN: tornado warnings | 47 | 15 | 68% | 41 | 59% | 12 min |
| NWS Twin Cities, MN: severe thunderstorm warnings | 194 | 98 | 49% | 328 | 70% | 20 min |
| NWS Twin Cities, MN: flash flood warnings | 18 | 10 | 44% | 26 | 85% | 126 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 4, 2:42 PM CST | Wind Advisory | MPX | 25 hr |
| Jan 13, 2:41 PM CST | Winter Weather Advisory | MPX | 15 hr |
| Jan 15, 2:53 PM CST | Wind Chill Advisory | MPX | 18 hr |
| Jan 15, 2:53 PM CST | Winter Storm Watch | MPX | 21 hr |
| Jan 16, 11:31 AM CST | Winter Storm Warning | MPX | 54 hr |
| Jan 21, 7:48 PM CST | Winter Weather Advisory | MPX | 21 hr |
| Feb 8, 4:30 AM CST | Winter Storm Watch | MPX | 11 hr |
| Feb 8, 4:30 AM CST | Winter Storm Warning | MPX | 34 hr |
| Feb 9, 6:39 AM CST | Mesoscale Discussion | SPC | 4 hr |
| Feb 11, 8:13 PM CST | Wind Chill Advisory | MPX | 40 hr |
| Feb 13, 2:55 PM CST | Wind Chill Advisory | MPX | 18 hr |
| Feb 16, 2:54 PM CST | Winter Weather Advisory | MPX | 33 hr |
| Mar 30, 11:12 AM CDT | River Flood Warning | MPX | 21 days |
| Apr 2, 3:35 AM CDT | Winter Weather Advisory | MPX | 42 hr |
| Apr 3, 9:42 AM CDT | River Flood Warning | MPX | 21 days |
| Apr 3, 9:42 AM CDT | River Flood Warning | MPX | 21 days |
| Apr 10, 3:30 PM CDT | Winter Storm Watch | MPX | 23 hr |
| Apr 11, 2:42 PM CDT | Winter Storm Warning | MPX | 37 hr |
| Apr 12, 12:38 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 20, 4:16 PM CDT | Special Weather Statement | MPX | 44 min |
| May 7, 3:46 AM CDT | Freeze Watch | MPX | 23 hr |
| May 7, 3:46 AM CDT | Freeze Warning | MPX | 29 hr |
| May 8, 3:11 AM CDT | Freeze Warning | MPX | 29 hr |
| May 10, 2:41 AM CDT | Freeze Warning | MPX | 29 hr |
| May 11, 2:01 PM CDT | Freeze Warning | MPX | 19 hr |
| May 24, 1:54 AM CDT | Dense Fog Advisory | MPX | 7 hr |
| May 25, 8:25 AM CDT | Severe Thunderstorm Warning | MPX | 35 min |
| May 26, 4:56 PM CDT | Flash Flood Watch | MPX | 11 hr |
| May 26, 6:02 PM CDT | Mesoscale Discussion | SPC | 88 min |
| May 26, 6:22 PM CDT | Special Weather Statement | MPX | 38 min |
| Jun 2, 3:52 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Jun 2, 4:36 PM CDT | Special Weather Statement | MPX | 39 min |
| Jun 2, 4:39 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 2, 5:16 PM CDT | Special Weather Statement | MPX | 44 min |
| Jun 2, 8:05 PM CDT | Special Weather Statement | MPX | 25 min |
| Jun 5, 1:20 AM CDT | Special Weather Statement | MPX | 40 min |
| Jun 8, 1:45 PM CDT | Flash Flood Watch | MPX | 35 hr |
| 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 23, 7:30 PM CDT | Special Weather Statement | MPX | 90 min |
| Jun 28, 5:14 PM CDT | Tornado Watch | SPC | 5 hr |
| Jun 28, 7:06 PM CDT | Tornado Warning | MPX | 24 min |
| Jun 28, 7:30 PM CDT | Special Weather Statement | MPX | 30 min |
| Jun 28, 7:49 PM CDT | Special Weather Statement | MPX | 41 min |
| Jun 28, 7:51 PM CDT | Tornado Warning | MPX | 24 min |
| Jun 28, 8:31 PM CDT | Special Weather Statement | MPX | 29 min |
| Jun 28, 8:43 PM CDT | Special Weather Statement | MPX | 17 min |
| Jun 29, 1:22 AM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 1:31 AM CDT | Flash Flood Watch | MPX | 10 hr |
| Jun 29, 2:04 AM CDT | Flash Flood Warning | MPX | 5 hr |
| Jun 29, 4:33 AM CDT | Special Weather Statement | MPX | 57 min |
| Jun 29, 4:53 AM CDT | Flash Flood Warning | MPX | 3 hr |
| Jun 29, 6:48 AM CDT | Areal Flood Warning | MPX | 10 hr |
| Jun 29, 7:40 AM CDT | Areal Flood Warning | MPX | 5 hr |
| Jun 29, 12:49 PM CDT | Areal Flood Warning | MPX | 3 hr |
| Jun 29, 4:58 PM CDT | Areal Flood Warning | MPX | 17 hr |
| Jun 30, 1:34 AM CDT | Special Weather Statement | MPX | 3 hr |
| Jul 7, 3:05 PM CDT | Heat Advisory | MPX | 29 hr |
| Jul 9, 5:38 AM CDT | Severe Thunderstorm Warning | MPX | 24 min |
| Jul 14, 7:58 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 16, 3:36 PM CDT | Excessive Heat Watch | MPX | 23 hr |
| Jul 17, 2:24 PM CDT | Heat Advisory | MPX | 31 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, 1:31 AM CDT | Mesoscale Discussion | SPC | 89 min |
| Jul 18, 3:43 AM CDT | Special Weather Statement | MPX | 32 min |
| Jul 18, 3:12 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Jul 18, 8:36 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Jul 18, 9:53 PM CDT | Tornado Warning | MPX | 37 min |
| Jul 21, 1:43 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 6:13 PM CDT | Mesoscale Discussion | SPC | 62 min |
| Jul 23, 2:37 PM CDT | Heat Advisory | MPX | 66 hr |
| Aug 8, 5:00 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 8, 5:25 PM CDT | Severe Thunderstorm Warning | MPX | 35 min |
| Aug 8, 5:53 PM CDT | Severe Thunderstorm Warning | MPX | 37 min |
| Aug 9, 12:30 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 9, 10:59 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 10, 2:30 AM CDT | Mesoscale Discussion | SPC | 90 min |
| Aug 10, 3:26 AM CDT | Special Weather Statement | MPX | 49 min |
| Aug 14, 5:38 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 14, 9:01 PM CDT | Severe Thunderstorm Warning | MPX | 44 min |
| Aug 21, 9:54 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 24, 4:00 PM CDT | Mesoscale Discussion | SPC | 90 min |
| Aug 25, 3:07 AM CDT | Heat Advisory | MPX | 16 hr |
| Aug 28, 1:54 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 28, 4:04 AM CDT | Mesoscale Discussion | SPC | 86 min |
| Aug 28, 5:32 AM CDT | Special Weather Statement | MPX | 28 min |
| Aug 28, 6:59 AM CDT | Mesoscale Discussion | SPC | 91 min |
| Sep 9, 2:45 AM CDT | Frost Advisory | MPX | 28 hr |
| Sep 10, 2:44 PM CDT | Frost Advisory | MPX | 18 hr |
| Sep 18, 4:07 AM CDT | Freeze Warning | MPX | 4 hr |
| Sep 25, 12:25 AM CDT | Dense Fog Advisory | MPX | 8 hr |
| Sep 30, 5:15 PM CDT | Special Weather Statement | MPX | 45 min |
| Sep 30, 6:46 PM CDT | Special Weather Statement | MPX | 44 min |
| Oct 1, 3:42 AM CDT | Freeze Warning | MPX | 28 hr |
| Oct 3, 2:59 PM CDT | Frost Advisory | MPX | 18 hr |
| Oct 19, 2:46 PM CDT | Winter Weather Advisory | MPX | 34 hr |
| Oct 20, 11:53 AM CDT | Winter Storm Warning | MPX | 13 hr |
| Oct 31, 1:55 PM CDT | Wind Advisory | MPX | 20 hr |
| Nov 7, 1:06 PM CST | Wind Advisory | MPX | 29 hr |
| Nov 9, 2:46 PM CST | Winter Storm Watch | MPX | 14 hr |
| Nov 9, 8:44 PM CST | Winter Weather Advisory | MPX | 29 hr |
| Nov 10, 9:19 AM CST | Mesoscale Discussion | SPC | 5 hr |
| Nov 14, 2:18 PM CST | Wind Advisory | MPX | 25 hr |
| Nov 24, 8:40 PM CST | Dense Fog Advisory | MPX | 8 hr |
| Dec 22, 2:50 PM CST | Winter Storm Warning | MPX | 36 hr |
| Dec 22, 2:50 PM CST | Winter Weather Advisory | MPX | 36 hr |
| Dec 23, 12:33 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Dec 23, 5:15 PM CST | Mesoscale Discussion | SPC | 6 hr |
| Dec 28, 3:18 AM CST | Winter Weather Advisory | MPX | 47 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 | 5 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 26 |
| Special Weather Statement | 18 |
| Flooding | |
| Areal Flood Warning | 4 |
| Flash Flood Warning | 2 |
| River Flood Warning | 3 |
| Flash Flood Watch | 3 |
| Winter | |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 4 |
| Winter Weather Advisory | 8 |
| Heat | |
| Excessive Heat Watch | 1 |
| Heat Advisory | 4 |
| Cold | |
| Freeze Warning | 6 |
| Freeze Watch | 1 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 3 |
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.