St. Clair County weather alerts
There are no active weather alerts for St. Clair County, MI right now.
Since 2016 the National Weather Service has issued about 505 alerts that included St. Clair County, roughly 51 a year. The most common is the severe thunderstorm warning (86 from 2016 to 2025). The last tornado warning was issued on September 2, 2026. 24 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 St. Clair County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Lapeer County, Sanilac County, Macomb County.
St. Clair County alert history
Alert events that included St. Clair County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 86 | 15 | September 3, 2026 |
| Winter Weather Advisory | 83 | 4 | January 25, 2026 |
| Wind Advisory | 57 | 2 | March 15, 2026 |
| Severe Thunderstorm Watch | 37 | 8 | September 3, 2026 |
| Frost Advisory | 32 | 8 | October 18, 2026 |
| Dense Fog Advisory | 30 | 11 | October 25, 2026 |
| Flood Advisory | 27 | 3 | October 2, 2026 |
| Flood Watch | 20 | 5 | August 2, 2026 |
| Winter Storm Warning | 19 | 0 | February 16, 2025 |
| Winter Storm Watch | 18 | 0 | February 16, 2025 |
| Flood Warning | 15 | 0 | January 27, 2024 |
| Freeze Warning | 14 | 3 | May 12, 2026 |
| Cold Weather Advisory | 13 | 4 | February 7, 2026 |
| Heat Advisory | 12 | 1 | July 14, 2026 |
| High Wind Warning | 11 | 1 | March 13, 2026 |
| High Wind Watch | 9 | 1 | March 13, 2026 |
| Snow Squall Warning | 4 | 0 | December 29, 2025 |
| Tornado Warning | 3 | 1 | September 2, 2026 |
| Tornado Watch | 3 | 2 | June 12, 2026 |
| Extreme Heat Warning | 2 | 1 | June 30, 2026 |
| Extreme Cold Warning | 2 | 0 | January 29, 2019 |
| Extreme Heat Watch | 2 | 2 | July 14, 2026 |
| Lake Effect Snow Warning | 1 | 0 | January 4, 2016 |
| Flash Flood Warning | 1 | 0 | July 13, 2017 |
| Red Flag Warning | 1 | 0 | May 1, 2018 |
| Extreme Cold Watch | 1 | 1 | January 23, 2026 |
| Ice Storm Warning | 1 | 0 | February 22, 2023 |
| Freeze Watch | 1 | 2 | May 2, 2026 |
Tornado history in St. Clair County
24 tornadoes have been recorded in St. Clair County since 1950, killing 3 people and injuring 100. That ranks 18 of 83 counties in Michigan. The most recent was on October 14, 2021 (rated EF0).
Strongest tornadoes in St. Clair County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| May 21, 1953 | F4 | St. Clair County | 10 mi | 1,760 yd | 2 | 68 |
| June 8, 1953 | F4 | Lapeer County | 33.8 mi | 833 yd | 0 | 23 |
| May 2, 1983 | F3 | Macomb County | 23 mi | 200 yd | 0 | 3 |
| September 2, 1984 | F3 | Sanilac County | 15.6 mi | 400 yd | 0 | 1 |
| June 21, 1996 | F2 | St. Clair County | 0.2 mi | 30 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| October 14, 2021 | EF0 | St. Clair County | 0.4 mi | 120 yd | 0 | 0 |
| November 6, 2015 | EF0 | St. Clair County | 1.2 mi | 75 yd | 0 | 0 |
| June 22, 2015 | EF0 | St. Clair County | 0.6 mi | 50 yd | 0 | 0 |
| June 27, 2010 | EF1 | St. Clair County | 2.9 mi | 250 yd | 1 | 4 |
| May 31, 2004 | F1 | St. Clair County | 1.5 mi | 80 yd | 0 | 0 |
About St. Clair County
- Population: 160,308 (2024 estimate)
- State: Michigan
- NOAA Weather Radio SAME code: 026147 (how to use it)