Tornado Risk in Pima County, AZ
How likely is a tornado in Pima County, AZ?
28 tornado tracks have crossed Pima County since 1954 by NOAA's count, roughly one every 2.7 years - the Elevated band on this site's scale. That is the 66th percentile nationally for tornado frequency. Arizona has 15 counties in this dataset; Pima County ranks 5 of them by frequency.
The number that matters more than frequency
No violent (EF4-5) tornado has been recorded in Pima County in NOAA's 76-year database. Of its 28 recorded tracks, 23 were weak (EF0-1) and 2 significant (EF2-3).
Shelter and safe-room economics
Arizona does not currently have a confirmed state rebate layered on top of FEMA's 75% Hazard Mitigation cost-share, so a Pima County homeowner should expect the full national range: $2,890-$13,280, $7,645 typical.
Power after the storm, not just shelter during it
A direct hit is not required for Pima County to lose power - outbreak-wide outages across Arizona regularly reach homes and businesses well outside the actual tracks. A battery bank covers that gap without a generator's fuel and venting needs.
What Pima County's figure does not tell you
Pima County's figure is county-wide, not address-specific. Pima County covers about 9,189 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. Pima County has about 1,080,149 residents.