Davis County, IA: Tornado Risk and Shelter Cost
Davis County's tornado history, by the numbers
NOAA's Storm Prediction Center has recorded 22 tornado tracks touching Davis County since 1961 - about one every 3.5 years on average. That puts it in our Moderate band nationally. Against the rest of the country, that is the 54th percentile for frequency. Iowa has 99 counties in this dataset; Davis County ranks 85 of them by frequency.
Has Davis County ever had a violent tornado?
Nothing violent in Davis County's file: 22 tracks total, topping out at significant (EF2-3) strength on 8 of them, zero at EF4-5.
Paying for it, if Davis 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 Iowa 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 Iowa 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. Davis County covers about 502 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. Davis County has about 9,193 residents.