Ontonagon County weather alerts
There are no active weather alerts for Ontonagon County, MI right now.
Since 2016 the National Weather Service has issued about 586 alerts that included Ontonagon County, roughly 59 a year. The most common is the winter weather advisory (177 from 2016 to 2025). The last tornado warning was issued on September 25, 2019. 3 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 Ontonagon County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Gogebic County, Houghton County, Iron County.
Ontonagon County alert history
Alert events that included Ontonagon County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Winter Weather Advisory | 177 | 16 | March 16, 2026 |
| Severe Thunderstorm Warning | 114 | 12 | August 7, 2026 |
| Winter Storm Warning | 54 | 6 | April 2, 2026 |
| Winter Storm Watch | 37 | 4 | April 4, 2026 |
| Frost Advisory | 33 | 4 | September 23, 2026 |
| Flood Advisory | 25 | 2 | July 30, 2026 |
| Cold Weather Advisory | 23 | 3 | January 25, 2026 |
| Severe Thunderstorm Watch | 21 | 3 | August 7, 2026 |
| Wind Advisory | 20 | 1 | February 27, 2026 |
| Dense Fog Advisory | 15 | 5 | September 1, 2026 |
| Flood Watch | 11 | 2 | April 24, 2026 |
| Red Flag Warning | 9 | 3 | October 10, 2026 |
| Fire Weather Watch | 7 | 1 | May 16, 2026 |
| Flash Flood Warning | 6 | 0 | June 19, 2024 |
| Blizzard Warning | 6 | 1 | March 15, 2026 |
| Lake Effect Snow Warning | 5 | 0 | January 4, 2017 |
| Freeze Warning | 5 | 1 | October 3, 2026 |
| Flood Warning | 4 | 0 | April 13, 2023 |
| Tornado Watch | 3 | 1 | July 20, 2026 |
| Heat Advisory | 3 | 2 | July 12, 2026 |
| Extreme Cold Warning | 3 | 1 | January 22, 2026 |
| Tornado Warning | 1 | 0 | September 25, 2019 |
| High Wind Watch | 1 | 0 | December 16, 2021 |
| High Wind Warning | 1 | 0 | December 16, 2021 |
| Ice Storm Warning | 1 | 1 | April 4, 2026 |
| Freeze Watch | 1 | 0 | October 8, 2025 |
| Extreme Cold Watch | 0 | 2 | January 23, 2026 |
| Extreme Heat Warning | 0 | 1 | July 13, 2026 |
Tornado history in Ontonagon County
3 tornadoes have been recorded in Ontonagon County since 1950. That ranks 78 of 83 counties in Michigan. The most recent was on August 19, 2011 (rated EF0).
Strongest tornadoes in Ontonagon County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 30, 1953 | F1 | Ontonagon County | 10.9 mi | 500 yd | 0 | 0 |
| August 19, 2011 | EF0 | Ontonagon County | 1.5 mi | 125 yd | 0 | 0 |
| May 12, 1988 | F0 | Ontonagon County | 0.2 mi | 10 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| August 19, 2011 | EF0 | Ontonagon County | 1.5 mi | 125 yd | 0 | 0 |
| May 12, 1988 | F0 | Ontonagon County | 0.2 mi | 10 yd | 0 | 0 |
| June 30, 1953 | F1 | Ontonagon County | 10.9 mi | 500 yd | 0 | 0 |
About Ontonagon County
- Population: 5,824 (2024 estimate)
- State: Michigan
- NOAA Weather Radio SAME code: 026131 (how to use it)