Tornado History Map

Merrimack County, New Hampshire tornado history

7 tornadoes recorded in or across Merrimack County from 1967 to 2018, coloured by rating on the map.

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Years1950 to 2025
Rating (F or EF scale)

Shows tornadoes that started in, or crossed, the chosen state. To see how many have passed near you, search a town or ZIP code, or tap the map.

Key
  • F0 / EF0 Light damage
  • F1 / EF1 Moderate damage
  • F2 / EF2 Considerable damage
  • F3 / EF3 Severe damage
  • F4 / EF4 Devastating damage
  • F5 / EF5 Incredible damage
  • Unknown Not rated (2007 onwards)

How to read the lines. Each line is one tornado, drawn from where it started to where it ended, coloured and sized by its rating. A dot means the record has no end point. Tap a line for its details, or tap anywhere else to see how many tornadoes have passed nearby. Weaker tornadoes appear as you zoom in. Ratings use the Fujita (F) scale before 1 February 2007 and the Enhanced Fujita (EF) scale from then on.

Tornadoes in Merrimack County

The Storm Prediction Center records 7 tornadoes whose paths touched Merrimack County, New Hampshire between 1967 and 2018. They killed 1 person and injured 12. The busiest month is July, with 4 tornadoes. The strongest was an EF2 on 24 July 2008. The most recent was on 4 May 2018.

  • 7tornadoes
  • 1death
  • 12injuries
  • 75per 10,000 sq mi of land

A tornado that crossed several counties counts in each one, so county counts add up to more than the state's.

How strong were the tornadoes in Merrimack County?

RatingTornadoesShare
F0 / EF0114%
F1 / EF1457%
F2 / EF2229%
F3 / EF300%
F4 / EF400%
F5 / EF500%
Unknown rating00%

Merrimack County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 2 in 1970s.1960s11970s21990s12000s12010s2

The 2010s only run to 2018, so that bar is for a shorter period. The record starts in 1950.

Show the numbers
PeriodCount
1960s1
1970s2
1990s1
2000s1
2010s2
Tornadoes by month
Bar chart of tornadoes by period. The most is 4 in Jul.Jan0Feb0Mar0Apr0May2Jun0Jul4Aug1Sep0Oct0Nov0Dec0
Show the numbers
PeriodCount
Jan0
Feb0
Mar0
Apr0
May2
Jun0
Jul4
Aug1
Sep0
Oct0
Nov0
Dec0

Records for Merrimack County

  • Deadliest and Strongest and Longest path: New Hampshire tornado24 July 2008, EF2, 1 death, 2 injuries, 50.5 miles long
  • Most recent: New Hampshire tornado4 May 2018, EF1, 37.6 miles long

Many of these tornadoes killed or injured people. The numbers are the official record's, and they may be revised.

More in New Hampshire

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