Grafton County, NH: Tornado Risk and Shelter Cost
Grafton County, NH: what NOAA's tornado record says
NOAA's Storm Prediction Center has recorded 13 tornado tracks touching Grafton County since 1963 - about one every 5.8 years on average. That puts it in our Low band nationally. Against the rest of the country, that is the 37th percentile for frequency. Within New Hampshire alone, Grafton County ranks 3 of 10 counties for tornado frequency.
Has Grafton County ever had a violent tornado?
Nothing violent in Grafton County's file: 13 tracks total, topping out at significant (EF2-3) strength on 3 of them, zero at EF4-5.
Paying for it, if Grafton County's history says you should
A storm shelter or in-residence safe room typically runs $2,890-$13,280 nationally, around $7,645 for a common single-family installation. No state-administered rebate program specific to New Hampshire was confirmed for this site - FEMA's own Hazard Mitigation Assistance grants fund 75% of an approved safe room nationwide, but only some states currently run a homeowner-facing application on top of that.
The gap a shelter does not cover
Tornado outbreaks routinely knock out power across New Hampshire for days, separately from any single house getting hit. A portable battery bank keeps a fridge, phone chargers and a radio running through that gap - cheaper and faster to set up than a generator.
County-level, not address-level
Treat this as a county-wide figure, not a prediction for one address. Grafton County covers about 1,709 square miles, so a single touch here counts the same as a single touch in a county a fraction of that size. And records from before the 1990s, NOAA notes, undercount weaker tornadoes in areas with less storm-spotting coverage at the time. Grafton County has about 93,045 residents.