Union County weather alerts
There are no active weather alerts for Union County, TN right now.
Since 2016 the National Weather Service has issued about 709 alerts that included Union County, roughly 71 a year. The most common is the severe thunderstorm warning (184 from 2016 to 2025). The last tornado warning was issued on May 26, 2024. 3 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 Grainger County, Anderson County, Campbell County, Claiborne 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 |
|---|---|---|---|
| Severe Thunderstorm Warning | 184 | 12 | September 20, 2026 |
| Flood Advisory | 87 | 13 | August 17, 2026 |
| Dense Fog Advisory | 62 | 7 | November 6, 2026 |
| Wind Advisory | 51 | 2 | October 10, 2026 |
| Freeze Warning | 48 | 0 | November 2, 2023 |
| Flood Watch | 41 | 7 | August 12, 2026 |
| Flood Warning | 40 | 0 | March 16, 2025 |
| Severe Thunderstorm Watch | 35 | 5 | August 17, 2026 |
| Frost Advisory | 31 | 1 | May 3, 2026 |
| Winter Weather Advisory | 26 | 1 | January 30, 2026 |
| Freeze Watch | 20 | 0 | November 1, 2023 |
| Flash Flood Warning | 20 | 5 | July 22, 2026 |
| Tornado Watch | 20 | 0 | May 20, 2025 |
| Winter Storm Warning | 9 | 2 | January 30, 2026 |
| Winter Storm Watch | 8 | 1 | January 24, 2026 |
| Cold Weather Advisory | 8 | 3 | January 31, 2026 |
| Heat Advisory | 5 | 3 | September 3, 2026 |
| Red Flag Warning | 4 | 0 | March 1, 2025 |
| Tornado Warning | 2 | 0 | May 26, 2024 |
| Extreme Cold Watch | 2 | 0 | January 20, 2025 |
| High Wind Watch | 2 | 0 | September 27, 2024 |
| High Wind Warning | 2 | 0 | September 27, 2024 |
| Extreme Cold Warning | 1 | 0 | December 23, 2022 |
| Fire Weather Watch | 1 | 0 | April 20, 2023 |
Tornado history in Union County
3 tornadoes have been recorded in Union County since 1950. That ranks 85 of 95 counties in Tennessee. The most recent was on May 8, 2009 (rated EF0).
Strongest tornadoes in Union County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| October 1, 1977 | F1 | Union County | 4.3 mi | 440 yd | 0 | 0 |
| April 4, 1974 | F0 | Anderson County | 8.7 mi | 200 yd | 0 | 0 |
| May 8, 2009 | EF0 | Union County | 0.8 mi | 20 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| May 8, 2009 | EF0 | Union County | 0.8 mi | 20 yd | 0 | 0 |
| October 1, 1977 | F1 | Union County | 4.3 mi | 440 yd | 0 | 0 |
| April 4, 1974 | F0 | Anderson County | 8.7 mi | 200 yd | 0 | 0 |
About Union County
- Population: 21,064 (2024 estimate)
- State: Tennessee
- NOAA Weather Radio SAME code: 047173 (how to use it)