Alert archive / Wisconsin / Marathon County
Weather alerts in Marathon County, Wisconsin, 2026
157 weather alerts in 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Marathon County and its neighbors
Each county as a circle sized by its count in 2026. Tap one for its archive.
- Alerts
- 157
- Warnings
- 61
- Watches
- 18
- Advisories
- 32
- Busiest month
- June42 alerts
- Busiest day
- April 13, 202612 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
3 of 8 tornado warnings covering Marathon County in 2026 had a tornado report inside them; 4 of 6 tornado reports fell inside a warning, on average 25 minutes after it went out.
Marathon County, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 8 | 3 | 63% | 6 | 67% | 25 min |
| Severe thunderstorm warnings | 35 | 16 | 54% | 37 | 92% | 21 min |
| Flash flood warnings | 4 | 3 | 25% | 0 |
Each office's whole area, 2026
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Green Bay, WI: tornado warnings | 26 | 4 | 85% | 10 | 60% | 23 min |
| NWS Green Bay, WI: severe thunderstorm warnings | 149 | 62 | 58% | 186 | 80% | 25 min |
| NWS Green Bay, WI: flash flood warnings | 12 | 8 | 33% | 31 | 74% | 50 min |
An office's figures cover every county it serves, including across state lines.
The year is still running; reports filed late and damage surveys can still change these figures.
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, 3:34 AM CST | Winter Weather Advisory | GRB | 21 hr |
| Jan 5, 3:17 AM CST | Winter Weather Advisory | GRB | 43 hr |
| Jan 8, 2:01 AM CST | Dense Fog Advisory | GRB | 10 hr |
| Jan 8, 10:39 AM CST | Flood Watch | GRB | 21 hr |
| Jan 16, 1:38 AM CST | Winter Weather Advisory | GRB | 34 hr |
| Jan 17, 2:00 PM CST | Cold Weather Advisory | GRB | 68 hr |
| Jan 20, 1:36 PM CST | Extreme Cold Watch | GRB | 48 hr |
| Jan 21, 1:31 PM CST | Extreme Cold Warning | GRB | 67 hr |
| Jan 24, 1:18 PM CST | Cold Weather Advisory | GRB | 23 hr |
| Jan 25, 2:33 AM CST | Cold Weather Advisory | GRB | 33 hr |
| Feb 19, 1:42 PM CST | Winter Weather Advisory | GRB | 46 hr |
| Mar 5, 9:39 PM CST | Dense Fog Advisory | GRB | 29 hr |
| Mar 7, 12:24 PM CST | River Flood Warning | GRB | 23 hr |
| Mar 10, 2:13 AM CDT | Winter Weather Advisory | GRB | 35 hr |
| Mar 12, 1:42 AM CDT | Winter Weather Advisory | GRB | 35 hr |
| Mar 12, 2:38 PM CDT | Winter Storm Watch | GRB | 22 hr |
| Mar 13, 12:59 PM CDT | Winter Storm Warning | GRB | 49 hr |
| Mar 14, 1:13 PM CDT | Blizzard Warning | GRB | 56 hr |
| Mar 14, 11:55 PM CDT | Mesoscale Discussion | SPC | 5 hr |
| Mar 15, 5:40 AM CDT | Mesoscale Discussion | SPC | 5 hr |
| Mar 16, 11:37 AM CDT | Winter Weather Advisory | GRB | 9 hr |
| Mar 30, 10:20 PM CDT | Special Weather Statement | GRB | 40 min |
| Mar 30, 10:36 PM CDT | Severe Thunderstorm Warning | GRB | 39 min |
| Mar 30, 11:15 PM CDT | Severe Thunderstorm Warning | GRB | 45 min |
| Mar 31, 2:10 PM CDT | Winter Storm Watch | GRB | 13 hr |
| Apr 1, 3:16 AM CDT | Ice Storm Warning | GRB | 40 hr |
| Apr 2, 3:55 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 2, 7:27 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 3, 2:30 AM CDT | Ice Storm Warning | GRB | 32 hr |
| Apr 3, 10:27 PM CDT | Mesoscale Discussion | SPC | 6 hr |
| Apr 12, 10:54 AM CDT | River Flood Warning | GRB | 21 days |
| Apr 13, 2:04 AM CDT | Flood Watch | GRB | 49 hr |
| Apr 13, 10:53 AM CDT | River Flood Warning | GRB | 11 hr |
| Apr 13, 1:57 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Apr 13, 3:11 PM CDT | Tornado Watch | SPC | 7 hr |
| Apr 13, 4:22 PM CDT | Severe Thunderstorm Warning | GRB | 53 min |
| Apr 13, 4:46 PM CDT | Severe Thunderstorm Warning | GRB | 59 min |
| Apr 13, 5:22 PM CDT | Flash Flood Warning | GRB | 5 hr |
| Apr 13, 5:41 PM CDT | Severe Thunderstorm Warning | GRB | 48 min |
| Apr 13, 5:42 PM CDT | Severe Thunderstorm Warning | GRB | 48 min |
| Apr 13, 5:55 PM CDT | Areal Flood Advisory | GRB | 3 hr |
| Apr 13, 6:44 PM CDT | Severe Thunderstorm Warning | GRB | 35 min |
| Apr 13, 6:55 PM CDT | Severe Thunderstorm Warning | GRB | 29 min |
| Apr 13, 7:19 PM CDT | Severe Thunderstorm Warning | GRB | 14 min |
| Apr 13, 8:06 PM CDT | Flash Flood Warning | GRB | 8 hr |
| Apr 14, 3:52 AM CDT | Areal Flood Advisory | GRB | 6 hr |
| Apr 14, 11:23 AM CDT | River Flood Warning | GRB | 34 hr |
| Apr 14, 7:00 PM CDT | Special Weather Statement | GRB | 45 min |
| Apr 15, 2:58 AM CDT | Dense Fog Advisory | GRB | 7 hr |
| Apr 15, 2:19 PM CDT | Dense Fog Advisory | GRB | 20 hr |
| Apr 16, 1:33 PM CDT | Flood Watch | GRB | 37 hr |
| Apr 17, 9:23 AM CDT | Severe Thunderstorm Watch | SPC | 11 hr |
| Apr 17, 12:40 PM CDT | Tornado Watch | SPC | 9 hr |
| Apr 17, 2:53 PM CDT | Severe Thunderstorm Warning | GRB | 82 min |
| Apr 17, 3:52 PM CDT | Severe Thunderstorm Warning | GRB | 53 min |
| Apr 17, 4:10 PM CDT | Flash Flood Warning | GRB | 5 hr |
| Apr 17, 4:21 PM CDT | Tornado Warning | GRB | 39 min |
| Apr 17, 4:44 PM CDT | Tornado Warning | GRB | 32 min |
| Apr 17, 5:06 PM CDT | Tornado Warning | GRB | 39 min |
| Apr 17, 5:06 PM CDT | Mesoscale Discussion | SPC | 114 min |
| Apr 17, 5:27 PM CDT | Severe Thunderstorm Warning | GRB | 37 min |
| Apr 17, 6:26 PM CDT | Special Weather Statement | GRB | 64 min |
| Apr 17, 6:52 PM CDT | Flash Flood Warning | GRB | 2 hr |
| Apr 18, 6:40 AM CDT | River Flood Warning | GRB | 16 hr |
| Apr 29, 1:03 PM CDT | Frost Advisory | GRB | 19 hr |
| Apr 30, 1:31 PM CDT | Freeze Warning | GRB | 18 hr |
| May 1, 7:56 AM CDT | Freeze Warning | GRB | 24 hr |
| May 5, 1:42 PM CDT | Frost Advisory | GRB | 18 hr |
| May 6, 1:23 PM CDT | Frost Advisory | GRB | 19 hr |
| May 7, 12:47 PM CDT | Frost Advisory | GRB | 19 hr |
| May 9, 1:15 PM CDT | Frost Advisory | GRB | 19 hr |
| May 10, 12:02 PM CDT | Freeze Warning | GRB | 20 hr |
| May 13, 1:05 PM CDT | Frost Advisory | GRB | 18 hr |
| May 15, 5:41 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| May 17, 9:12 PM CDT | Special Weather Statement | GRB | 33 min |
| May 18, 10:59 PM CDT | Special Weather Statement | GRB | 46 min |
| May 27, 3:14 PM CDT | Mesoscale Discussion | SPC | 91 min |
| May 27, 3:15 PM CDT | Special Weather Statement | GRB | 45 min |
| May 27, 3:27 PM CDT | Severe Thunderstorm Warning | GRB | 48 min |
| May 27, 3:59 PM CDT | Severe Thunderstorm Warning | GRB | 46 min |
| May 27, 4:36 PM CDT | Severe Thunderstorm Warning | GRB | 39 min |
| May 27, 5:13 PM CDT | Areal Flood Advisory | GRB | 3 hr |
| May 27, 5:19 PM CDT | Severe Thunderstorm Warning | GRB | 26 min |
| Jun 5, 2:38 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Jun 5, 5:24 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 5:44 PM CDT | Special Weather Statement | GRB | 61 min |
| Jun 5, 5:54 PM CDT | Areal Flood Advisory | GRB | 3 hr |
| Jun 5, 6:46 PM CDT | Special Weather Statement | GRB | 59 min |
| Jun 10, 6:18 AM CDT | Mesoscale Discussion | SPC | 87 min |
| Jun 10, 6:41 AM CDT | Severe Thunderstorm Warning | GRB | 49 min |
| Jun 10, 7:18 AM CDT | Severe Thunderstorm Warning | GRB | 57 min |
| Jun 10, 7:48 AM CDT | Areal Flood Advisory | GRB | 3 hr |
| Jun 10, 12:00 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 10, 2:25 PM CDT | Severe Thunderstorm Warning | GRB | 65 min |
| Jun 10, 3:24 PM CDT | Severe Thunderstorm Warning | GRB | 66 min |
| Jun 10, 3:30 PM CDT | Special Weather Statement | GRB | 45 min |
| Jun 10, 3:50 PM CDT | Tornado Warning | GRB | 40 min |
| Jun 10, 4:19 PM CDT | Areal Flood Advisory | GRB | 4 hr |
| Jun 10, 9:54 PM CDT | Special Weather Statement | GRB | 66 min |
| Jun 10, 10:40 PM CDT | Special Weather Statement | GRB | 50 min |
| Jun 11, 2:50 AM CDT | Flood Watch | GRB | 17 hr |
| Jun 11, 6:49 PM CDT | Special Weather Statement | GRB | 56 min |
| Jun 16, 10:45 AM CDT | Special Weather Statement | GRB | 75 min |
| Jun 19, 7:18 PM CDT | Special Weather Statement | GRB | 57 min |
| Jun 19, 9:06 PM CDT | Special Weather Statement | GRB | 39 min |
| Jun 24, 12:44 PM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 24, 1:55 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 24, 1:57 PM CDT | Special Weather Statement | GRB | 33 min |
| Jun 24, 2:11 PM CDT | Severe Thunderstorm Warning | GRB | 64 min |
| Jun 24, 2:17 PM CDT | Severe Thunderstorm Warning | GRB | 58 min |
| Jun 24, 4:49 PM CDT | Special Weather Statement | GRB | 56 min |
| Jun 24, 5:06 PM CDT | Severe Thunderstorm Warning | GRB | 48 min |
| Jun 24, 5:28 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jun 24, 5:43 PM CDT | Severe Thunderstorm Warning | GRB | 34 min |
| Jun 28, 1:33 AM CDT | Extreme Heat Watch | GRB | 10 hr |
| Jun 28, 11:54 AM CDT | Extreme Heat Warning | GRB | 55 hr |
| Jun 30, 7:54 AM CDT | Mesoscale Discussion | SPC | 96 min |
| Jun 30, 8:20 AM CDT | Severe Thunderstorm Warning | GRB | 61 min |
| Jun 30, 8:38 AM CDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 30, 2:49 PM CDT | Severe Thunderstorm Warning | GRB | 41 min |
| Jun 30, 2:51 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 30, 3:19 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 30, 3:29 PM CDT | Severe Thunderstorm Warning | GRB | 46 min |
| Jun 30, 3:44 PM CDT | Special Weather Statement | GRB | 46 min |
| Jun 30, 4:35 PM CDT | Severe Thunderstorm Warning | GRB | 30 min |
| Jul 1, 6:59 AM CDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 1, 11:23 AM CDT | Flood Watch | GRB | 19 hr |
| Jul 2, 1:02 AM CDT | Areal Flood Advisory | GRB | 3 hr |
| Jul 8, 1:59 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 8, 5:43 PM CDT | Areal Flood Advisory | GRB | 3 hr |
| Jul 12, 1:33 PM CDT | Heat Advisory | GRB | 3 days |
| Jul 20, 1:53 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 3:49 PM CDT | Tornado Watch | SPC | 7 hr |
| Jul 20, 7:06 PM CDT | Special Weather Statement | GRB | 54 min |
| Jul 20, 7:36 PM CDT | Tornado Warning | GRB | 39 min |
| Jul 20, 7:37 PM CDT | Tornado Warning | GRB | 38 min |
| Jul 20, 8:04 PM CDT | Tornado Warning | GRB | 41 min |
| Jul 20, 8:04 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Jul 20, 8:06 PM CDT | Tornado Warning | GRB | 54 min |
| Jul 26, 8:28 PM CDT | Mesoscale Discussion | SPC | 92 min |
| Jul 26, 11:15 PM CDT | Special Weather Statement | GRB | 30 min |
| Jul 26, 11:54 PM CDT | Mesoscale Discussion | SPC | 96 min |
| Jul 27, 4:57 PM CDT | Mesoscale Discussion | SPC | 93 min |
| Aug 9, 9:33 PM CDT | Special Weather Statement | GRB | 42 min |
| Aug 10, 5:05 AM CDT | Dense Fog Advisory | GRB | 4 hr |
| Aug 11, 10:04 PM CDT | Mesoscale Discussion | SPC | 116 min |
| Aug 11, 10:15 PM CDT | Special Weather Statement | GRB | 45 min |
| Aug 11, 10:43 PM CDT | Severe Thunderstorm Warning | GRB | 62 min |
| Aug 11, 11:26 PM CDT | Severe Thunderstorm Warning | GRB | 64 min |
| Aug 12, 12:27 AM CDT | Severe Thunderstorm Warning | GRB | 46 min |
| Aug 12, 1:05 AM CDT | Severe Thunderstorm Warning | GRB | 40 min |
| Sep 1, 12:15 AM CDT | Dense Fog Advisory | GRB | 9 hr |
| Sep 3, 7:52 AM CDT | Mesoscale Discussion | SPC | 83 min |
| Sep 4, 4:27 PM CDT | Severe Thunderstorm Warning | GRB | 48 min |
| Sep 4, 5:07 PM CDT | Severe Thunderstorm Warning | GRB | 53 min |
| Sep 4, 5:48 PM CDT | Severe Thunderstorm Warning | GRB | 57 min |
| Sep 4, 6:18 PM CDT | Areal Flood Advisory | GRB | 3 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive2025
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.