Lewis and Clark County, MT: Tornado Risk and Shelter Cost
Lewis and Clark County, MT: what NOAA's tornado record says
NOAA's Storm Prediction Center has recorded 6 tornado tracks touching Lewis and Clark County since 1953 - about one every 12.7 years on average. That puts it in our Minimal band nationally. Against the rest of the country, that is the 20th percentile for frequency. Within Montana alone, Lewis and Clark County ranks 28 of 56 counties for tornado frequency.
Has Lewis and Clark County ever had a violent tornado?
Nothing violent in Lewis and Clark County's file: 6 tracks total, topping out at significant (EF2-3) strength on 0 of them, zero at EF4-5.
Paying for it, if Lewis and Clark 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 Montana 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
The storm that misses Lewis and Clark County outright can still take its power out - outbreak-scale outages across Montana are common well beyond the tracked path. A battery-backup unit handles that without a generator's setup or fuel.
County-level, not address-level
Treat this as a county-wide figure, not a prediction for one address. Lewis and Clark County covers about 3,458 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. Lewis and Clark County has about 75,129 residents.