Mercer County weather alerts
There are no active weather alerts for Mercer County, NJ right now.
Since 2016 the National Weather Service has issued about 1,384 alerts that included Mercer County, roughly 138 a year. The most common is the severe thunderstorm warning (257 from 2016 to 2025). The last tornado warning was issued on November 12, 2026. 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 Mercer County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring Hunterdon County, Bucks County, Somerset County, Middlesex 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 |
|---|---|---|---|
| Severe Thunderstorm Warning | 257 | 35 | November 12, 2026 |
| Flood Advisory | 220 | 0 | March 23, 2024 |
| Flood Watch | 112 | 10 | September 13, 2026 |
| Severe Thunderstorm Watch | 106 | 16 | October 16, 2026 |
| Wind Advisory | 76 | 3 | September 23, 2026 |
| Flood Warning | 70 | 4 | August 28, 2026 |
| Flash Flood Warning | 70 | 24 | November 12, 2026 |
| Dense Fog Advisory | 68 | 8 | May 10, 2026 |
| Winter Weather Advisory | 58 | 2 | March 3, 2026 |
| Coastal Flood Advisory | 52 | 0 | June 5, 2024 |
| Heat Advisory | 47 | 7 | September 3, 2026 |
| Frost Advisory | 37 | 4 | October 25, 2026 |
| Extreme Heat Warning | 23 | 2 | July 15, 2026 |
| Tornado Warning | 20 | 1 | November 12, 2026 |
| Freeze Warning | 19 | 4 | October 25, 2026 |
| Red Flag Warning | 18 | 0 | November 16, 2024 |
| Extreme Heat Watch | 16 | 2 | July 15, 2026 |
| Tornado Watch | 16 | 4 | November 12, 2026 |
| Winter Storm Warning | 16 | 2 | February 22, 2026 |
| Winter Storm Watch | 14 | 2 | February 22, 2026 |
| Snow Squall Warning | 12 | 2 | January 1, 2026 |
| Freeze Watch | 10 | 3 | April 21, 2026 |
| High Wind Warning | 10 | 0 | December 19, 2025 |
| Coastal Flood Warning | 10 | 0 | April 12, 2024 |
| Fire Weather Watch | 9 | 0 | November 16, 2024 |
| High Wind Watch | 7 | 0 | February 16, 2025 |
| Cold Weather Advisory | 7 | 4 | February 8, 2026 |
| Blizzard Warning | 2 | 1 | February 22, 2026 |
| Tropical Storm Watch | 1 | 0 | August 2, 2020 |
| Tropical Storm Warning | 1 | 0 | August 3, 2020 |
| Extreme Cold Watch | 0 | 1 | February 7, 2026 |
| Extreme Cold Warning | 0 | 1 | February 7, 2026 |
Tornado history in Mercer County
14 tornadoes have been recorded in Mercer County since 1950, injuring 1 people. That ranks 5 of 21 counties in New Jersey. The most recent was on June 14, 2024 (rated EF0).
Strongest tornadoes in Mercer County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 24, 1960 | F3 | Mercer County | 12.9 mi | 200 yd | 0 | 0 |
| February 21, 2023 | EF2 | Mercer County | 5.8 mi | 200 yd | 0 | 0 |
| August 17, 1988 | F2 | Mercer County | 4.5 mi | 200 yd | 0 | 0 |
| June 13, 1958 | F2 | Burlington County | 0.1 mi | 150 yd | 0 | 1 |
| September 23, 2003 | F1 | Mercer County | 5 mi | 100 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| June 14, 2024 | EF0 | Mercer County | 0.1 mi | 60 yd | 0 | 0 |
| April 1, 2023 | EF1 | Burlington County | 2.7 mi | 300 yd | 0 | 0 |
| April 1, 2023 | EF1 | Burlington County | 2.7 mi | 300 yd | 0 | 0 |
| February 21, 2023 | EF2 | Mercer County | 5.8 mi | 200 yd | 0 | 0 |
| September 1, 2021 | EF0 | Mercer County | 2.6 mi | 100 yd | 0 | 0 |
About Mercer County
- Population: 392,138 (2024 estimate)
- State: New Jersey
- NOAA Weather Radio SAME code: 034021 (how to use it)