Alert archive / Wisconsin / Portage County
Weather alerts in Portage County, Wisconsin, 2020
95 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Portage County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 95
- Warnings
- 17
- Watches
- 8
- Advisories
- 28
- Busiest month
- May19 alerts
- Busiest day
- May 26, 20204 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Portage County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 5 | 38% | 6 | 50% | 13 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Green Bay, WI: tornado warnings | 1 | 0 | 100% | 3 | 0% | |
| NWS Green Bay, WI: severe thunderstorm warnings | 80 | 38 | 53% | 110 | 72% | 23 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 8, 3:04 PM CST | Winter Weather Advisory | GRB | 30 hr |
| Jan 16, 2:28 PM CST | Winter Weather Advisory | GRB | 67 hr |
| Feb 8, 3:14 AM CST | Winter Storm Watch | GRB | 11 hr |
| Feb 8, 2:34 PM CST | Winter Storm Warning | GRB | 28 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, 2:30 PM CST | Wind Chill Advisory | GRB | 20 hr |
| Feb 16, 2:58 PM CST | Winter Weather Advisory | GRB | 41 hr |
| Feb 17, 3:27 PM CST | Mesoscale Discussion | SPC | 4 hr |
| Mar 29, 10:30 AM CDT | River Flood Warning | GRB | 3 days |
| Mar 29, 12:39 PM CDT | River Flood Warning | GRB | 67 hr |
| Apr 8, 12:46 AM CDT | Dense Fog Advisory | GRB | 9 hr |
| Apr 11, 2:40 PM CDT | Winter Storm Warning | GRB | 46 hr |
| Apr 11, 2:40 PM CDT | Winter Weather Advisory | GRB | 42 hr |
| Apr 20, 5:58 PM CDT | Special Weather Statement | GRB | 47 min |
| Apr 20, 6:36 PM CDT | Special Weather Statement | GRB | 54 min |
| Apr 20, 6:58 PM CDT | Severe Thunderstorm Warning | GRB | 47 min |
| Apr 28, 12:52 AM CDT | Dense Fog Advisory | GRB | 10 hr |
| May 2, 2:27 PM CDT | Fire Weather Watch | GRB | 14 hr |
| May 3, 4:38 AM CDT | Red Flag Warning | GRB | 14 hr |
| May 6, 2:40 PM CDT | Frost Advisory | GRB | 15 hr |
| May 7, 9:15 AM CDT | Freeze Warning | GRB | 24 hr |
| May 7, 9:36 AM CDT | Freeze Watch | GRB | 18 hr |
| May 8, 3:31 AM CDT | Freeze Warning | GRB | 28 hr |
| May 10, 2:50 PM CDT | Freeze Warning | GRB | 17 hr |
| May 11, 2:52 PM CDT | Freeze Warning | GRB | 17 hr |
| May 12, 2:36 PM CDT | Frost Advisory | GRB | 17 hr |
| May 17, 8:00 PM CDT | Wind Advisory | GRB | 8 hr |
| May 25, 10:59 AM CDT | Mesoscale Discussion | SPC | 61 min |
| May 26, 1:19 PM CDT | Special Weather Statement | GRB | 56 min |
| May 26, 1:59 PM CDT | Special Weather Statement | GRB | 61 min |
| May 26, 2:56 PM CDT | Special Weather Statement | GRB | 94 min |
| May 26, 4:29 PM CDT | Special Weather Statement | GRB | 91 min |
| May 27, 4:54 PM CDT | Special Weather Statement | GRB | 51 min |
| May 27, 6:10 PM CDT | Special Weather Statement | GRB | 50 min |
| May 28, 8:18 AM CDT | Areal Flood Advisory | GRB | 6 hr |
| May 30, 1:44 PM CDT | Frost Advisory | GRB | 18 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, 6:32 PM CDT | Areal Flood Advisory | GRB | 3 hr |
| Jun 2, 6:42 PM CDT | Severe Thunderstorm Warning | GRB | 63 min |
| Jun 5, 3:53 AM CDT | Special Weather Statement | GRB | 52 min |
| Jun 5, 4:42 AM CDT | Special Weather Statement | GRB | 63 min |
| Jun 11, 3:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Jun 20, 8:41 AM CDT | Special Weather Statement | GRB | 49 min |
| Jun 20, 9:21 AM CDT | Areal Flood Advisory | GRB | 4 hr |
| Jun 20, 9:25 AM CDT | Special Weather Statement | GRB | 50 min |
| Jun 20, 10:52 AM CDT | Special Weather Statement | GRB | 38 min |
| Jun 21, 9:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 8:51 AM CDT | Special Weather Statement | GRB | 84 min |
| Jul 6, 6:57 PM CDT | Special Weather Statement | GRB | 63 min |
| Jul 7, 3:10 PM CDT | Special Weather Statement | GRB | 50 min |
| Jul 9, 8:36 AM CDT | Special Weather Statement | GRB | 39 min |
| Jul 9, 12:11 PM CDT | Flood Watch | GRB | 16 hr |
| Jul 14, 6:50 AM CDT | Special Weather Statement | GRB | 40 min |
| Jul 14, 4:11 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 14, 6:46 PM CDT | Special Weather Statement | GRB | 44 min |
| Jul 14, 7:21 PM CDT | Special Weather Statement | GRB | 39 min |
| Jul 14, 7:24 PM CDT | Severe Thunderstorm Warning | GRB | 33 min |
| Jul 17, 2:30 PM CDT | Heat Advisory | GRB | 30 hr |
| Jul 18, 4:02 AM CDT | Mesoscale Discussion | SPC | 88 min |
| Jul 18, 9:44 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 19, 1:13 AM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 19, 2:48 AM CDT | Special Weather Statement | GRB | 42 min |
| Jul 21, 7:52 PM CDT | Special Weather Statement | GRB | 38 min |
| Aug 8, 9:12 PM CDT | Severe Thunderstorm Warning | GRB | 49 min |
| Aug 10, 7:57 AM CDT | Severe Thunderstorm Warning | GRB | 48 min |
| Aug 10, 8:38 AM CDT | Severe Thunderstorm Warning | GRB | 35 min |
| Aug 10, 12:44 PM CDT | Mesoscale Discussion | SPC | 61 min |
| Aug 15, 12:03 AM CDT | Special Weather Statement | GRB | 57 min |
| Aug 15, 12:53 AM CDT | Special Weather Statement | GRB | 52 min |
| Aug 24, 8:50 PM CDT | Special Weather Statement | GRB | 40 min |
| Aug 24, 10:55 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 25, 12:47 AM CDT | Severe Thunderstorm Warning | GRB | 44 min |
| Aug 25, 10:58 AM CDT | Severe Thunderstorm Warning | GRB | 32 min |
| Aug 27, 7:30 PM CDT | Flash Flood Watch | GRB | 17 hr |
| Aug 28, 6:58 AM CDT | Special Weather Statement | GRB | 47 min |
| Aug 28, 7:52 AM CDT | Special Weather Statement | GRB | 38 min |
| Aug 28, 8:43 AM CDT | Special Weather Statement | GRB | 62 min |
| Sep 10, 2:29 PM CDT | Frost Advisory | GRB | 18 hr |
| Sep 17, 11:38 AM CDT | Frost Advisory | GRB | 20 hr |
| Sep 18, 1:43 PM CDT | Frost Advisory | GRB | 18 hr |
| Sep 25, 2:00 AM CDT | Dense Fog Advisory | GRB | 5 hr |
| Sep 26, 3:07 PM CDT | Mesoscale Discussion | SPC | 83 min |
| Oct 1, 3:33 AM CDT | Frost Advisory | GRB | 29 hr |
| Oct 2, 2:22 PM CDT | Frost Advisory | GRB | 18 hr |
| Oct 3, 2:23 PM CDT | Frost Advisory | GRB | 18 hr |
| Oct 12, 9:07 AM CDT | Special Weather Statement | GRB | 53 min |
| Oct 14, 7:16 PM CDT | Special Weather Statement | GRB | 44 min |
| Oct 31, 9:00 PM CDT | Wind Advisory | GRB | 22 hr |
| Nov 14, 2:30 PM CST | Wind Advisory | GRB | 31 hr |
| Nov 23, 2:29 PM CST | Winter Weather Advisory | GRB | 30 hr |
| Nov 24, 9:42 PM CST | Dense Fog Advisory | GRB | 9 hr |
| Dec 27, 3:38 AM CST | Winter Weather Advisory | GRB | 19 hr |
| Dec 28, 2:03 PM CST | Winter Weather Advisory | GRB | 43 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 | 8 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 12 |
| Special Weather Statement | 30 |
| Flooding | |
| River Flood Warning | 2 |
| Flash Flood Watch | 1 |
| Flood Watch | 1 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 1 |
| Frost Advisory | 9 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 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 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.