Union County weather alerts
There are no active weather alerts for Union County, IA right now.
Since 2016 the National Weather Service has issued about 855 alerts that included Union County, roughly 86 a year. The most common is the severe thunderstorm warning (179 from 2016 to 2025). The last tornado warning was issued on June 11, 2026. 41 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 Ringgold County, Adams County, Adair 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 | 179 | 17 | September 15, 2026 |
| Dense Fog Advisory | 101 | 6 | September 17, 2026 |
| Severe Thunderstorm Watch | 85 | 9 | September 6, 2026 |
| Wind Advisory | 75 | 2 | March 12, 2026 |
| Winter Weather Advisory | 71 | 3 | April 7, 2026 |
| Heat Advisory | 48 | 4 | August 31, 2026 |
| Flood Watch | 38 | 8 | September 30, 2026 |
| Tornado Watch | 38 | 10 | September 14, 2026 |
| Cold Weather Advisory | 35 | 2 | January 26, 2026 |
| Tornado Warning | 26 | 3 | June 11, 2026 |
| Freeze Warning | 21 | 1 | October 17, 2026 |
| Winter Storm Watch | 20 | 0 | November 29, 2025 |
| Red Flag Warning | 19 | 6 | March 28, 2026 |
| Winter Storm Warning | 18 | 0 | November 28, 2025 |
| Frost Advisory | 13 | 1 | May 2, 2026 |
| Extreme Heat Watch | 9 | 2 | July 27, 2026 |
| Flash Flood Warning | 9 | 2 | June 11, 2026 |
| Extreme Cold Warning | 9 | 1 | January 23, 2026 |
| Extreme Heat Warning | 7 | 2 | July 26, 2026 |
| Freeze Watch | 7 | 1 | October 17, 2026 |
| Fire Weather Watch | 7 | 2 | March 28, 2026 |
| High Wind Warning | 6 | 3 | May 17, 2026 |
| Blizzard Warning | 4 | 1 | March 15, 2026 |
| Flood Warning | 3 | 0 | March 14, 2019 |
| Extreme Cold Watch | 3 | 1 | January 23, 2026 |
| High Wind Watch | 3 | 2 | March 15, 2026 |
| Ice Storm Warning | 1 | 0 | January 15, 2017 |
Tornado history in Union County
41 tornadoes have been recorded in Union County since 1950, injuring 9 people. That ranks 30 of 99 counties in Iowa. The most recent was on April 17, 2025 (rated EF1).
Strongest tornadoes in Union County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| May 27, 1995 | F4 | Union County | 57 mi | 500 yd | 0 | 2 |
| April 8, 1999 | F4 | Union County | 56 mi | 1,250 yd | 0 | 1 |
| May 24, 1989 | F4 | Adams County | 49 mi | 1,760 yd | 0 | 0 |
| March 29, 1979 | F3 | Union County | 57 mi | 500 yd | 0 | 4 |
| April 14, 2012 | EF2 | Adams County | 16.6 mi | 800 yd | 0 | 2 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| April 17, 2025 | EF1 | Union County | 4.3 mi | 50 yd | 0 | 0 |
| May 21, 2024 | EF0 | Union County | 4 mi | 75 yd | 0 | 0 |
| May 21, 2024 | EF1 | Adams County | 12.7 mi | 200 yd | 0 | 0 |
| April 26, 2024 | EF2 | Union County | 6.7 mi | 130 yd | 0 | 0 |
| April 26, 2024 | EF1 | Union County | 9.4 mi | 150 yd | 0 | 0 |
About Union County
- Population: 11,955 (2024 estimate)
- State: Iowa
- NOAA Weather Radio SAME code: 019175 (how to use it)