St. Lawrence County weather alerts
There are no active weather alerts for St. Lawrence County, NY right now.
Since 2016 the National Weather Service has issued about 721 alerts that included St. Lawrence County, roughly 72 a year. The most common is the winter weather advisory (158 from 2016 to 2025). The last tornado warning was issued on March 16, 2025. 11 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. Lawrence County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Herkimer County, Jefferson County, Hamilton County, Franklin County.
St. Lawrence County alert history
Alert events that included St. Lawrence County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Winter Weather Advisory | 158 | 12 | April 1, 2026 |
| Severe Thunderstorm Warning | 121 | 23 | September 13, 2026 |
| Wind Advisory | 60 | 7 | June 18, 2026 |
| Winter Storm Warning | 51 | 3 | February 20, 2026 |
| Frost Advisory | 45 | 5 | September 24, 2026 |
| Winter Storm Watch | 42 | 1 | January 25, 2026 |
| Cold Weather Advisory | 36 | 4 | March 2, 2026 |
| Severe Thunderstorm Watch | 28 | 3 | July 15, 2026 |
| Flood Watch | 24 | 1 | March 9, 2026 |
| Heat Advisory | 23 | 2 | July 14, 2026 |
| Flood Warning | 22 | 3 | September 3, 2026 |
| Snow Squall Warning | 16 | 1 | January 19, 2026 |
| Freeze Warning | 13 | 2 | May 22, 2026 |
| High Wind Warning | 12 | 0 | January 27, 2025 |
| Extreme Cold Warning | 12 | 3 | February 7, 2026 |
| Flash Flood Warning | 12 | 0 | August 9, 2024 |
| Lake Effect Snow Warning | 10 | 0 | November 27, 2025 |
| High Wind Watch | 7 | 0 | January 27, 2025 |
| Tornado Watch | 6 | 1 | June 18, 2026 |
| Extreme Cold Watch | 5 | 2 | February 7, 2026 |
| Freeze Watch | 4 | 0 | October 10, 2025 |
| Dense Fog Advisory | 3 | 0 | December 28, 2023 |
| Blizzard Warning | 3 | 0 | February 16, 2025 |
| Ice Storm Warning | 3 | 0 | December 29, 2025 |
| Fire Weather Watch | 2 | 1 | April 28, 2026 |
| Extreme Heat Warning | 1 | 0 | July 1, 2018 |
| Red Flag Warning | 1 | 1 | April 28, 2026 |
| Tornado Warning | 1 | 0 | March 16, 2025 |
Tornado history in St. Lawrence County
11 tornadoes have been recorded in St. Lawrence County since 1950, killing 1 people and injuring 4. That ranks 16 of 62 counties in New York. The most recent was on August 11, 2024 (rated EF0).
Strongest tornadoes in St. Lawrence County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| August 15, 1986 | F2 | St. Lawrence County | 0.2 mi | 10 yd | 1 | 3 |
| September 19, 1954 | F2 | St. Lawrence County | 0.1 mi | 10 yd | 0 | 0 |
| May 31, 1985 | F1 | St. Lawrence County | 5 mi | 50 yd | 0 | 0 |
| August 7, 1972 | F1 | St. Lawrence County | 4.9 mi | 30 yd | 0 | 0 |
| July 10, 1989 | F1 | St. Lawrence County | 1.7 mi | 30 yd | 0 | 1 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| August 11, 2024 | EF0 | St. Lawrence County | 0.1 mi | 20 yd | 0 | 0 |
| June 9, 2004 | F0 | St. Lawrence County | 0.2 mi | 100 yd | 0 | 0 |
| June 9, 2004 | F0 | St. Lawrence County | 2 mi | 350 yd | 0 | 0 |
| June 21, 1993 | F0 | St. Lawrence County | 0.4 mi | 20 yd | 0 | 0 |
| July 10, 1989 | F1 | St. Lawrence County | 1.7 mi | 30 yd | 0 | 1 |
About St. Lawrence County
- Population: 106,198 (2024 estimate)
- State: New York
- NOAA Weather Radio SAME code: 036089 (how to use it)