Mercer County, IL: Tornado Risk and Shelter Cost
Mercer County's tornado history, by the numbers
NOAA's Storm Prediction Center has recorded 46 tornado tracks touching Mercer County since 1952 - about one every 1.7 years on average. That puts it in our High band nationally. Against the rest of the country, that is the 85th percentile for frequency. Within Illinois alone, Mercer County ranks 25 of 102 counties for tornado frequency.
Has Mercer County ever had a violent tornado?
Nothing violent in Mercer County's file: 46 tracks total, topping out at significant (EF2-3) strength on 8 of them, zero at EF4-5.
Paying for it, if Mercer 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 Illinois 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 Mercer County outright can still take its power out - outbreak-scale outages across Illinois 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. Mercer County covers about 561 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. Mercer County has about 15,292 residents.