Union County weather alerts
There are no active weather alerts for Union County, OH right now.
Since 2016 the National Weather Service has issued about 725 alerts that included Union County, roughly 73 a year. The most common is the severe thunderstorm warning (118 from 2016 to 2025). The last tornado warning was issued on June 6, 2024. 12 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 Marion County, Delaware County, Logan County, Madison 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 | 118 | 24 | September 4, 2026 |
| Flood Advisory | 85 | 12 | September 21, 2026 |
| Winter Weather Advisory | 71 | 2 | February 23, 2026 |
| Wind Advisory | 66 | 3 | March 15, 2026 |
| Dense Fog Advisory | 61 | 8 | October 21, 2026 |
| Severe Thunderstorm Watch | 43 | 15 | September 5, 2026 |
| Freeze Warning | 40 | 4 | October 18, 2026 |
| Flood Watch | 37 | 6 | September 20, 2026 |
| Frost Advisory | 35 | 5 | October 19, 2026 |
| Cold Weather Advisory | 25 | 8 | February 7, 2026 |
| Tornado Watch | 21 | 2 | March 26, 2026 |
| Heat Advisory | 18 | 4 | September 1, 2026 |
| Freeze Watch | 18 | 3 | October 18, 2026 |
| Tornado Warning | 17 | 0 | June 6, 2024 |
| Flash Flood Warning | 14 | 3 | September 5, 2026 |
| High Wind Warning | 10 | 2 | March 15, 2026 |
| Flood Warning | 9 | 2 | September 5, 2026 |
| Winter Storm Watch | 7 | 1 | January 24, 2026 |
| Extreme Heat Watch | 6 | 0 | June 22, 2025 |
| Winter Storm Warning | 6 | 1 | January 24, 2026 |
| High Wind Watch | 5 | 1 | March 13, 2026 |
| Red Flag Warning | 4 | 0 | April 20, 2023 |
| Extreme Cold Watch | 3 | 1 | January 26, 2026 |
| Extreme Heat Warning | 2 | 1 | June 30, 2026 |
| Extreme Cold Warning | 2 | 3 | January 31, 2026 |
| Fire Weather Watch | 1 | 0 | May 1, 2018 |
| Snow Squall Warning | 1 | 0 | December 12, 2024 |
Tornado history in Union County
12 tornadoes have been recorded in Union County since 1950, killing 4 people and injuring 68. That ranks 60 of 88 counties in Ohio. The most recent was on December 29, 2024 (rated EF0).
Strongest tornadoes in Union County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| November 10, 2002 | F3 | Logan County | 9 mi | 300 yd | 0 | 2 |
| April 11, 1965 | F2 | Union County | 22.2 mi | 400 yd | 4 | 62 |
| March 14, 2024 | EF2 | Union County | 19.5 mi | 600 yd | 0 | 0 |
| July 10, 1966 | F1 | Union County | 2 mi | 150 yd | 0 | 0 |
| June 21, 1981 | F1 | Union County | 1.9 mi | 100 yd | 0 | 3 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| December 29, 2024 | EF0 | Union County | 0.4 mi | 50 yd | 0 | 0 |
| March 14, 2024 | EF2 | Union County | 19.5 mi | 600 yd | 0 | 0 |
| June 6, 2010 | EF0 | Union County | 3.4 mi | 100 yd | 0 | 0 |
| November 10, 2002 | F1 | Union County | 0.5 mi | 200 yd | 0 | 0 |
| November 10, 2002 | F3 | Logan County | 9 mi | 300 yd | 0 | 2 |
About Union County
- Population: 71,721 (2024 estimate)
- State: Ohio
- NOAA Weather Radio SAME code: 039159 (how to use it)