Mercer County weather alerts
There are no active weather alerts for Mercer County, OH right now.
Since 2016 the National Weather Service has issued about 618 alerts that included Mercer County, roughly 62 a year. The most common is the winter weather advisory (70 from 2016 to 2025). The last tornado warning was issued on June 17, 2026. 25 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 Mercer County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Jay County, Van Wert County, Darke County, Auglaize County.
Mercer County alert history
Alert events that included Mercer County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Winter Weather Advisory | 70 | 2 | February 23, 2026 |
| Severe Thunderstorm Warning | 68 | 24 | August 12, 2026 |
| Wind Advisory | 66 | 4 | March 15, 2026 |
| Flood Advisory | 57 | 8 | September 16, 2026 |
| Dense Fog Advisory | 52 | 9 | October 24, 2026 |
| Severe Thunderstorm Watch | 42 | 16 | September 5, 2026 |
| Frost Advisory | 36 | 5 | October 19, 2026 |
| Freeze Warning | 35 | 4 | October 18, 2026 |
| Flood Watch | 30 | 5 | September 20, 2026 |
| Cold Weather Advisory | 26 | 8 | February 7, 2026 |
| Heat Advisory | 20 | 6 | September 1, 2026 |
| Tornado Watch | 20 | 2 | March 26, 2026 |
| Tornado Warning | 18 | 3 | June 17, 2026 |
| Freeze Watch | 16 | 3 | October 18, 2026 |
| High Wind Warning | 11 | 2 | March 15, 2026 |
| Flood Warning | 9 | 4 | September 19, 2026 |
| Winter Storm Watch | 7 | 1 | January 24, 2026 |
| Flash Flood Warning | 6 | 2 | September 17, 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 |
| Extreme Heat Warning | 3 | 1 | June 30, 2026 |
| Extreme Cold Watch | 3 | 1 | January 26, 2026 |
| Red Flag Warning | 2 | 0 | October 14, 2022 |
| Extreme Cold Warning | 2 | 2 | January 28, 2026 |
| Fire Weather Watch | 1 | 0 | May 1, 2018 |
| Ice Storm Warning | 1 | 0 | November 15, 2018 |
Tornado history in Mercer County
25 tornadoes have been recorded in Mercer County since 1950, killing 1 people and injuring 21. That ranks 17 of 88 counties in Ohio. The most recent was on May 7, 2024 (rated EF2).
Strongest tornadoes in Mercer County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| May 27, 2019 | EF3 | Mercer County | 10.8 mi | 250 yd | 1 | 8 |
| May 7, 2024 | EF2 | Mercer County | 8.1 mi | 400 yd | 0 | 0 |
| May 7, 2024 | EF2 | Mercer County | 6.4 mi | 300 yd | 0 | 0 |
| June 18, 2021 | EF2 | Mercer County | 5.6 mi | 200 yd | 0 | 0 |
| November 5, 2017 | EF2 | Mercer County | 5.4 mi | 200 yd | 0 | 8 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| May 7, 2024 | EF2 | Mercer County | 6.4 mi | 300 yd | 0 | 0 |
| May 7, 2024 | EF2 | Mercer County | 8.1 mi | 400 yd | 0 | 0 |
| May 4, 2024 | ? | Mercer County | 0.6 mi | 30 yd | 0 | 0 |
| March 14, 2024 | EF1 | Mercer County | 16 mi | 1,050 yd | 0 | 0 |
| March 31, 2023 | EF0 | Mercer County | 8.4 mi | 200 yd | 0 | 0 |
About Mercer County
- Population: 42,648 (2024 estimate)
- State: Ohio
- NOAA Weather Radio SAME code: 039107 (how to use it)