Tornado Risk in Shelby County, IL
Shelby County's tornado history, by the numbers
35 tornado tracks have crossed Shelby County since 1955 by NOAA's count, roughly one every 2.2 years - the Elevated band on this site's scale. That is the 75th percentile nationally for tornado frequency. Illinois has 102 counties in this dataset; Shelby County ranks 41 of them by frequency.
The number that matters more than frequency
No violent (EF4-5) tornado has been recorded in Shelby County in NOAA's 76-year database. Of its 35 recorded tracks, 27 were weak (EF0-1) and 8 significant (EF2-3).
Shelter and safe-room economics
Illinois does not currently have a confirmed state rebate layered on top of FEMA's 75% Hazard Mitigation cost-share, so a Shelby County homeowner should expect the full national range: $2,890-$13,280, $7,645 typical.
Power after the storm, not just shelter during it
The storm that misses Shelby 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.
What Shelby County's figure does not tell you
Shelby County's figure is county-wide, not address-specific. Shelby County covers about 759 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. Shelby County has about 20,542 residents.