Lewis County weather alerts
There are no active weather alerts for Lewis County, NY right now.
Since 2016 the National Weather Service has issued about 901 alerts that included Lewis County, roughly 90 a year. The most common is the severe thunderstorm warning (191 from 2016 to 2025). The last tornado warning was issued on September 9, 2024. 8 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 Lewis County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Oswego County, Herkimer County, St. Lawrence County, Jefferson County.
Lewis County alert history
Alert events that included Lewis County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Severe Thunderstorm Warning | 191 | 18 | August 14, 2026 |
| Winter Weather Advisory | 176 | 9 | March 17, 2026 |
| Winter Storm Watch | 78 | 3 | March 13, 2026 |
| Lake Effect Snow Warning | 55 | 2 | March 17, 2026 |
| Wind Advisory | 54 | 4 | June 18, 2026 |
| Winter Storm Warning | 50 | 4 | March 13, 2026 |
| Flood Warning | 40 | 3 | April 3, 2026 |
| Severe Thunderstorm Watch | 37 | 4 | August 27, 2026 |
| Flood Watch | 33 | 3 | August 2, 2026 |
| Frost Advisory | 31 | 2 | May 22, 2026 |
| Cold Weather Advisory | 23 | 3 | February 8, 2026 |
| High Wind Warning | 21 | 2 | June 18, 2026 |
| High Wind Watch | 17 | 1 | March 15, 2026 |
| Freeze Warning | 14 | 1 | May 12, 2026 |
| Tornado Warning | 14 | 0 | September 9, 2024 |
| Heat Advisory | 14 | 3 | July 14, 2026 |
| Extreme Cold Warning | 11 | 3 | February 7, 2026 |
| Flash Flood Warning | 8 | 0 | July 24, 2024 |
| Freeze Watch | 7 | 0 | October 2, 2025 |
| Snow Squall Warning | 7 | 0 | February 3, 2023 |
| Extreme Cold Watch | 6 | 2 | February 7, 2026 |
| Tornado Watch | 6 | 2 | September 2, 2026 |
| Dense Fog Advisory | 3 | 2 | March 21, 2026 |
| Blizzard Warning | 3 | 0 | February 27, 2020 |
| Flood Advisory | 1 | 0 | February 26, 2016 |
| Extreme Heat Warning | 1 | 0 | July 1, 2018 |
Tornado history in Lewis County
8 tornadoes have been recorded in Lewis County since 1950. That ranks 29 of 62 counties in New York. The most recent was on August 7, 2023 (rated EF3).
Strongest tornadoes in Lewis County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| August 7, 2023 | EF3 | Lewis County | 16 mi | 700 yd | 0 | 0 |
| July 8, 2014 | EF1 | Lewis County | 12.3 mi | 300 yd | 0 | 0 |
| August 1, 2005 | F1 | Lewis County | 1.5 mi | 50 yd | 0 | 0 |
| July 12, 1969 | F1 | Lewis County | 0.8 mi | 150 yd | 0 | 0 |
| June 4, 1987 | F0 | Lewis County | 0.4 mi | 50 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| August 7, 2023 | EF3 | Lewis County | 16 mi | 700 yd | 0 | 0 |
| August 7, 2023 | ? | Lewis County | 0.9 mi | 100 yd | 0 | 0 |
| August 16, 2016 | EF0 | Lewis County | 0.2 mi | 10 yd | 0 | 0 |
| July 8, 2014 | EF1 | Lewis County | 12.3 mi | 300 yd | 0 | 0 |
| August 1, 2005 | F1 | Lewis County | 1.5 mi | 50 yd | 0 | 0 |
About Lewis County
- Population: 26,570 (2024 estimate)
- State: New York
- NOAA Weather Radio SAME code: 036049 (how to use it)