How Likely Is a Tornado in Boone County, IN?
Boone County's tornado history, by the numbers
Boone County has recorded 34 tornado touches in NOAA's 76-year database, a rate of roughly one every 2.2 years - our Elevated band. Put another way: Boone County sees more tornado activity than 74% of US counties. Within Indiana alone, Boone County ranks 7 of 92 counties for tornado frequency.
Beyond the frequency band: violent history
1 tornado touching Boone County reached violent (EF4-5) strength since 1950. That single fact carries more weight for the shelter decision than the county's overall frequency band.
The dollar figure Boone County's rating leads to
Indiana's Indiana Department of Homeland Security's Residential Safe Room Program is the number that matters for a Boone County homeowner: 75% of an approved shelter, capped at $5,000, cutting the typical $2,890-$13,280 national range to about $722.5-$8,280 net.
What a direct hit isn't required for
Power loss after a tornado outbreak in Indiana often reaches homes the storm itself never touched. A battery-backup unit covers the outage without the fuel and venting a generator needs.
What this number is, and is not
One caveat before relying on Boone County's number: it is county-wide, and it covers about 423 square miles, so a single touch counts the same as one in a county a fraction of that size. Weaker pre-1990s tornadoes are also documented as undercounted in NOAA's own record. Boone County has about 78,773 residents.