Nassau County weather alerts
There are no active weather alerts for Nassau County, NY right now.
Since 2016 the National Weather Service has issued about 1,244 alerts that included Nassau County, roughly 124 a year. The most common is the coastal flood advisory (286 from 2016 to 2025). The last tornado warning was issued on August 20, 2026. 9 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 Nassau County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Suffolk County, Queens County.
Nassau County alert history
Alert events that included Nassau County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Coastal Flood Advisory | 286 | 11 | November 13, 2026 |
| Flood Advisory | 223 | 25 | November 13, 2026 |
| Severe Thunderstorm Warning | 108 | 11 | August 8, 2026 |
| Wind Advisory | 96 | 3 | September 25, 2026 |
| Dense Fog Advisory | 65 | 7 | May 10, 2026 |
| Coastal Flood Warning | 60 | 2 | September 25, 2026 |
| Flood Watch | 57 | 5 | September 13, 2026 |
| Winter Weather Advisory | 53 | 2 | February 10, 2026 |
| Severe Thunderstorm Watch | 50 | 9 | October 16, 2026 |
| Flash Flood Warning | 47 | 6 | August 27, 2026 |
| Heat Advisory | 46 | 4 | August 9, 2026 |
| High Wind Watch | 18 | 0 | November 6, 2025 |
| High Wind Warning | 17 | 1 | September 26, 2026 |
| Freeze Warning | 16 | 1 | April 8, 2026 |
| Winter Storm Watch | 16 | 2 | February 22, 2026 |
| Winter Storm Warning | 15 | 1 | January 25, 2026 |
| Freeze Watch | 10 | 2 | April 21, 2026 |
| Frost Advisory | 9 | 1 | April 9, 2026 |
| Tropical Storm Watch | 6 | 0 | August 20, 2021 |
| Tropical Storm Warning | 6 | 0 | August 20, 2021 |
| Snow Squall Warning | 6 | 2 | January 1, 2026 |
| Extreme Heat Watch | 5 | 1 | July 4, 2026 |
| Extreme Heat Warning | 5 | 1 | July 1, 2026 |
| Tornado Watch | 5 | 1 | July 21, 2026 |
| Blizzard Warning | 4 | 1 | February 22, 2026 |
| Flood Warning | 4 | 0 | September 2, 2021 |
| Cold Weather Advisory | 3 | 5 | February 8, 2026 |
| Tornado Warning | 3 | 2 | August 20, 2026 |
| Fire Weather Watch | 2 | 0 | April 4, 2019 |
| Red Flag Warning | 2 | 0 | April 4, 2019 |
| Storm Surge Warning | 1 | 0 | August 20, 2021 |
| Extreme Cold Watch | 0 | 1 | February 7, 2026 |
| Extreme Cold Warning | 0 | 1 | February 7, 2026 |
Tornado history in Nassau County
9 tornadoes have been recorded in Nassau County since 1950, injuring 6 people. That ranks 25 of 62 counties in New York. The most recent was on November 13, 2021 (rated EF0).
Strongest tornadoes in Nassau County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| September 18, 1973 | F2 | Nassau County | 1.9 mi | 167 yd | 0 | 0 |
| September 27, 1970 | F2 | Nassau County | 0.5 mi | 77 yd | 0 | 0 |
| September 7, 1998 | F2 | Nassau County | 0.2 mi | 200 yd | 0 | 6 |
| July 23, 1995 | F1 | Nassau County | 0.2 mi | 130 yd | 0 | 0 |
| August 12, 2005 | F1 | Nassau County | 0.2 mi | 50 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| November 13, 2021 | EF0 | Nassau County | 13.1 mi | 50 yd | 0 | 0 |
| August 25, 2006 | F0 | Nassau County | 0.3 mi | 150 yd | 0 | 0 |
| August 12, 2005 | F1 | Nassau County | 0.2 mi | 50 yd | 0 | 0 |
| September 7, 1998 | F2 | Nassau County | 0.2 mi | 200 yd | 0 | 6 |
| July 23, 1995 | F1 | Nassau County | 0.2 mi | 130 yd | 0 | 0 |
About Nassau County
- Population: 1,392,438 (2024 estimate)
- State: New York
- NOAA Weather Radio SAME code: 036059 (how to use it)