Tornado Risk in Johnson County, IN
How likely is a tornado in Johnson County, IN?
24 tornado tracks have crossed Johnson County since 1954 by NOAA's count, roughly one every 3.2 years - the Moderate band on this site's scale. That is the 59th percentile nationally for tornado frequency. Among 92 Indiana counties in this dataset, Johnson County ranks 31 for how often a tornado touches down.
The number that matters more than frequency
No violent (EF4-5) tornado has been recorded in Johnson County in NOAA's 76-year database. Of its 24 recorded tracks, 13 were weak (EF0-1) and 11 significant (EF2-3).
Shelter and safe-room economics
A storm shelter or in-residence safe room typically runs $2,890-$13,280 nationally (around $7,645 typical). Indiana's Indiana Department of Homeland Security's Residential Safe Room Program covers 75% of an approved project, up to $5,000 - bringing a typical job down to roughly $722.5-$8,280 out of pocket, when the program is currently funded.
Power after the storm, not just shelter during it
The storm that misses Johnson County outright can still take its power out - outbreak-scale outages across Indiana are common well beyond the tracked path. A battery-backup unit handles that without a generator's setup or fuel.
What Johnson County's figure does not tell you
Johnson County's figure is county-wide, not address-specific. Johnson County covers about 320 square miles, so a single touch here counts the same as a single touch in a county a fraction of that size. NOAA also documents that older records undercount weaker tornadoes from before Doppler radar became standard. Johnson County has about 170,614 residents.