Tornado Risk in Washington County, WI
Washington County's tornado history, by the numbers
20 tornado tracks have crossed Washington County since 1964 by NOAA's count, roughly one every 3.8 years - the Moderate band on this site's scale. That is the 51st percentile nationally for tornado frequency. Wisconsin has 72 counties in this dataset; Washington County ranks 45 of them by frequency.
The number that matters more than frequency
Yes. Washington County has recorded 1 EF4 or EF5 tornado - the strength FEMA's own safe-room guidance is built around, because a standard code-built house is not expected to survive those winds without a hardened room. A county can be lower-frequency overall and still carry this history.
Shelter and safe-room economics
Wisconsin does not currently have a confirmed state rebate layered on top of FEMA's 75% Hazard Mitigation cost-share, so a Washington 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 Washington County outright can still take its power out - outbreak-scale outages across Wisconsin are common well beyond the tracked path. A battery-backup unit handles that without a generator's setup or fuel.
What Washington County's figure does not tell you
Washington County's figure is county-wide, not address-specific. Washington County covers about 431 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. Washington County has about 138,727 residents.