Merrimack County, New Hampshire tornadoes
7confirmed tornadoes since NOAA records began in 1950 (the first here in 1967). Most recent: May 4, 2018, EF1. 2026 so far: 0 preliminary reports preliminary
Every tornado path in the county
Each path is a straight line from where the tornado started to where it ended, which is all most NOAA records hold. Tap a path for its details.
Recent warnings in Merrimack County
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At a glance
Deaths and injuries are NOAA's totals for each tornado's whole path, which can extend beyond Merrimack County.
When tornadoes hit here
By month
July is the peak month, with 4 of 7 tornadoes.
By time of day
Most often around 3:00 PM. Times as recorded by NOAA, mostly Central Standard Time.
By year, 1950 to 2025
The line is the five-year average. Tornadoes before about 1953 were under-reported, and better radar since the 1990s finds more weak ones.
By rating
Ratings before February 2007 use the original F scale; the numbers line up with today's EF scale. Unknown means NOAA could not assign a rating.
Notable tornadoes
All 7 tornadoes, newest first
| Date | Rating | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|
| May 4, 2018 | EF1 | 37.55 mi | 300 yd | 0 | 0 |
| Jul 30, 2015 | EF0 | 0.42 mi | 100 yd | 0 | 0 |
| Jul 24, 2008 | EF2 | 50.46 mi | 880 yd | 1 | 2 |
| Jul 6, 1999 | F2 | 7.5 mi | n/a | 0 | 0 |
| Aug 15, 1976 | F1 | 0.1 mi | 10 yd | 0 | 5 |
| May 31, 1972 | F1 | 0.1 mi | 50 yd | 0 | 0 |
| Jul 12, 1967 | F1 | 0.5 mi | 30 yd | 0 | 5 |
Nearby counties
Free tornado alerts for Merrimack County
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Source: NOAA Storm Prediction Center severe weather database, 1950 to 2025, and SPC preliminary reports for 2026. Page built October 13, 2026.