Tornado Risk in Des Moines County, IA
Des Moines County, IA: what NOAA's tornado record says
24 tornado tracks have crossed Des Moines 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. Iowa has 99 counties in this dataset; Des Moines County ranks 80 of them by frequency.
The number that matters more than frequency
No violent (EF4-5) tornado has been recorded in Des Moines County in NOAA's 76-year database. Of its 24 recorded tracks, 14 were weak (EF0-1) and 9 significant (EF2-3).
Shelter and safe-room economics
Iowa does not currently have a confirmed state rebate layered on top of FEMA's 75% Hazard Mitigation cost-share, so a Des Moines 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 Des Moines County outright can still take its power out - outbreak-scale outages across Iowa are common well beyond the tracked path. A battery-backup unit handles that without a generator's setup or fuel.
What Des Moines County's figure does not tell you
Des Moines County's figure is county-wide, not address-specific. Des Moines County covers about 416 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. Des Moines County has about 38,411 residents.