New Hampshire

Storm History: Merrimack County, New Hampshire

544 episodes, 774 events since 1962

Every storm the National Weather Service has filed in Merrimack County, New Hampshire: floods, hail, damaging wind, tornadoes, winter storms, heat and the rest, with the most serious on record. Events filed by forecast zone count for every county the zone covers.

The record

Events
774
Deaths
2
Injuries
20
Damage
$28 million
Episodes
544

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

Open the live radar over Merrimack County

Every year

From 1996 the record holds 48 kinds of event with each office’s narrative; before that, tornadoes, hail and thunderstorm wind only, and before 1955 tornadoes alone.

By kind of event

Counted under the kind that heads each episode.

Kind of eventEventsDeathsInjuriesDamage
Hail18600$124,000
Heavy Snow11900
Thunderstorm Wind11712$70,000
Flood7900$6.4 million
Flash Flood4300$3.1 million
Tornado40010$178,000
Winter Storm3600
Strong Wind3111$5,000
Winter Weather2200
Drought2100$9.6 million
High Wind2001$15,000
Lightning1703$3.6 million
Cold/Wind Chill1400
Extreme Cold/Wind Chill700
Debris Flow501$106,000
Blizzard400
Ice Storm301$5.2 million
Heavy Rain200
Heat200
Tropical Storm201$5,000
Freezing Fog100
Coastal Flood100
Frost/Freeze100
Excessive Heat100

The deadliest

The costliest

Damage within this county, in the dollars of its year.

The largest hail

The largest stone in each episode, which may have fallen in a neighboring county of the same episode.

The strongest tornadoes

Every tornado in Merrimack County, with its track

Every episode, newest first

Earlier years, state by state:

More

Tornadoes in Merrimack CountyEvery warning in Merrimack County since 1986Every county in New Hampshire

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.