Tornado Risk in Warren County, IL
Warren County, IL: what NOAA's tornado record says
38 tornado tracks have crossed Warren County since 1959 by NOAA's count, roughly one every 2 years - the Elevated band on this site's scale. That is the 78th percentile nationally for tornado frequency. Among 102 Illinois counties in this dataset, Warren County ranks 37 for how often a tornado touches down.
The number that matters more than frequency
Yes. Warren 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
Illinois does not currently have a confirmed state rebate layered on top of FEMA's 75% Hazard Mitigation cost-share, so a Warren County homeowner should expect the full national range: $2,890-$13,280, $7,645 typical.
Power after the storm, not just shelter during it
16,217 people live in Warren County, and a tornado outbreak's power loss usually reaches far more of Illinois than the tracks themselves touch. A portable battery unit is the faster, no-fuel way to bridge that outage.
What Warren County's figure does not tell you
Warren County's figure is county-wide, not address-specific. Warren County covers about 542 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. Warren County has about 16,217 residents.