Union County weather alerts
There are no active weather alerts for Union County, NJ right now.
Since 2016 the National Weather Service has issued about 1,071 alerts that included Union County, roughly 107 a year. The most common is the flood advisory (217 from 2016 to 2025). The last tornado warning was issued on May 29, 2019. 14 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 Union County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Somerset County, Middlesex County, Essex County, Hudson County.
Union County alert history
Alert events that included Union County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Flood Advisory | 217 | 27 | November 13, 2026 |
| Coastal Flood Advisory | 122 | 4 | September 28, 2026 |
| Severe Thunderstorm Warning | 110 | 17 | September 1, 2026 |
| Flood Watch | 84 | 9 | September 13, 2026 |
| Wind Advisory | 76 | 3 | September 25, 2026 |
| Severe Thunderstorm Watch | 74 | 12 | October 16, 2026 |
| Winter Weather Advisory | 58 | 2 | February 10, 2026 |
| Flash Flood Warning | 57 | 12 | September 1, 2026 |
| Heat Advisory | 52 | 5 | August 9, 2026 |
| Dense Fog Advisory | 26 | 3 | March 16, 2026 |
| Frost Advisory | 17 | 1 | April 9, 2026 |
| Winter Storm Warning | 17 | 2 | February 22, 2026 |
| Red Flag Warning | 16 | 0 | November 16, 2024 |
| Freeze Warning | 16 | 2 | April 21, 2026 |
| Winter Storm Watch | 16 | 2 | February 22, 2026 |
| Flood Warning | 14 | 0 | July 15, 2025 |
| Freeze Watch | 13 | 2 | April 21, 2026 |
| Coastal Flood Warning | 12 | 2 | September 25, 2026 |
| High Wind Watch | 11 | 0 | November 6, 2025 |
| Extreme Heat Warning | 10 | 1 | July 1, 2026 |
| High Wind Warning | 9 | 0 | December 24, 2020 |
| Extreme Heat Watch | 8 | 1 | July 4, 2026 |
| Fire Weather Watch | 8 | 0 | November 16, 2024 |
| Tornado Watch | 6 | 1 | July 21, 2026 |
| Tropical Storm Warning | 5 | 0 | August 21, 2021 |
| Snow Squall Warning | 5 | 1 | January 1, 2026 |
| Tropical Storm Watch | 4 | 0 | August 20, 2021 |
| Cold Weather Advisory | 4 | 5 | February 8, 2026 |
| Blizzard Warning | 2 | 1 | February 22, 2026 |
| Tornado Warning | 2 | 0 | May 29, 2019 |
| Extreme Cold Watch | 0 | 1 | February 7, 2026 |
| Extreme Cold Warning | 0 | 1 | February 7, 2026 |
Tornado history in Union County
14 tornadoes have been recorded in Union County since 1950, injuring 11 people. That ranks 5 of 21 counties in New Jersey. The most recent was on August 7, 2019 (rated EF0).
Strongest tornadoes in Union County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| October 5, 1985 | F1 | Middlesex County | 12 mi | 77 yd | 0 | 8 |
| July 26, 1994 | F1 | Union County | 2 mi | 100 yd | 0 | 0 |
| June 29, 1973 | F1 | Union County | 0.5 mi | 23 yd | 0 | 0 |
| July 26, 1987 | F1 | Union County | 0.5 mi | 23 yd | 0 | 0 |
| April 5, 1952 | F1 | Union County | 0.2 mi | 33 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| August 7, 2019 | EF0 | Union County | 0.1 mi | 100 yd | 0 | 0 |
| July 1, 2013 | EF0 | Union County | 4.8 mi | 50 yd | 0 | 0 |
| September 7, 1998 | F1 | Union County | 0.2 mi | 50 yd | 0 | 0 |
| September 7, 1998 | F0 | Union County | 0.2 mi | 30 yd | 0 | 0 |
| July 26, 1994 | F1 | Union County | 2 mi | 100 yd | 0 | 0 |
About Union County
- Population: 594,160 (2024 estimate)
- State: New Jersey
- NOAA Weather Radio SAME code: 034039 (how to use it)
- Cities: Elizabeth