Winnebago County weather alerts
There are no active weather alerts for Winnebago County, WI right now.
Since 2016 the National Weather Service has issued about 591 alerts that included Winnebago County, roughly 59 a year. The most common is the winter weather advisory (113 from 2016 to 2025). The last tornado warning was issued on July 27, 2026. 33 tornadoes have touched down in the county since 1950.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
No warnings, watches or advisories include Winnebago County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Waushara County, Waupaca County, Green Lake County, Calumet County.
Winnebago County alert history
Alert events that included Winnebago County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Winter Weather Advisory | 113 | 7 | April 2, 2026 |
| Severe Thunderstorm Warning | 79 | 15 | September 4, 2026 |
| Dense Fog Advisory | 54 | 9 | October 23, 2026 |
| Cold Weather Advisory | 42 | 3 | January 26, 2026 |
| Flood Advisory | 40 | 10 | September 15, 2026 |
| Wind Advisory | 39 | 1 | March 13, 2026 |
| Severe Thunderstorm Watch | 37 | 10 | September 2, 2026 |
| Frost Advisory | 27 | 5 | May 8, 2026 |
| Winter Storm Watch | 24 | 1 | March 15, 2026 |
| Winter Storm Warning | 24 | 1 | March 15, 2026 |
| Flood Watch | 23 | 5 | July 2, 2026 |
| Flood Warning | 22 | 4 | April 22, 2026 |
| Freeze Warning | 15 | 3 | October 17, 2026 |
| Heat Advisory | 12 | 3 | July 27, 2026 |
| Tornado Watch | 10 | 4 | July 20, 2026 |
| Flash Flood Warning | 6 | 2 | July 2, 2026 |
| Tornado Warning | 5 | 2 | July 27, 2026 |
| Blizzard Warning | 3 | 1 | March 15, 2026 |
| High Wind Warning | 3 | 0 | November 5, 2022 |
| Snow Squall Warning | 3 | 0 | December 4, 2024 |
| Extreme Heat Warning | 2 | 1 | June 29, 2026 |
| Extreme Cold Warning | 2 | 1 | January 23, 2026 |
| Fire Weather Watch | 2 | 0 | April 13, 2023 |
| Red Flag Warning | 2 | 0 | April 13, 2023 |
| Freeze Watch | 1 | 1 | October 17, 2026 |
| High Wind Watch | 1 | 0 | December 16, 2021 |
| Extreme Cold Watch | 0 | 1 | January 23, 2026 |
| Extreme Heat Watch | 0 | 1 | June 29, 2026 |
Tornado history in Winnebago County
33 tornadoes have been recorded in Winnebago County since 1950, killing 8 people and injuring 111. That ranks 19 of 72 counties in Wisconsin. The most recent was on June 20, 2020 (rated EF0).
Strongest tornadoes in Winnebago County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| April 3, 1956 | F4 | Green Lake County | 11.5 mi | 440 yd | 7 | 50 |
| April 27, 1984 | F4 | Winnebago County | 27.5 mi | 60 yd | 1 | 19 |
| April 21, 1974 | F4 | Fond du Lac County | 26 mi | 200 yd | 0 | 35 |
| May 8, 1964 | F2 | Winnebago County | 30.6 mi | 63 yd | 0 | 5 |
| April 10, 2011 | EF1 | Waushara County | 14.9 mi | 150 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 20, 2020 | EF0 | Winnebago County | 3.4 mi | 75 yd | 0 | 0 |
| June 20, 2020 | EF0 | Winnebago County | 1.1 mi | 75 yd | 0 | 0 |
| June 20, 2020 | EF0 | Winnebago County | 0.2 mi | 50 yd | 0 | 0 |
| June 14, 2017 | EF1 | Winnebago County | 8 mi | 125 yd | 0 | 0 |
| August 18, 2014 | EF0 | Winnebago County | 2.1 mi | 50 yd | 0 | 0 |
About Winnebago County
- Population: 173,307 (2024 estimate)
- State: Wisconsin
- NOAA Weather Radio SAME code: 055139 (how to use it)