Tornado Risk in Jerauld County, SD
Jerauld County's tornado history, by the numbers
15 tornado tracks have crossed Jerauld County since 1971 by NOAA's count, roughly one every 5.1 years - the Low band on this site's scale. That is the 40th percentile nationally for tornado frequency. South Dakota has 66 counties in this dataset; Jerauld County ranks 60 of them by frequency.
The number that matters more than frequency
Yes. Jerauld 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
South Dakota does not currently have a confirmed state rebate layered on top of FEMA's 75% Hazard Mitigation cost-share, so a Jerauld County homeowner should expect the full national range: $2,890-$13,280, $7,645 typical.
Power after the storm, not just shelter during it
1,689 people live in Jerauld County, and a tornado outbreak's power loss usually reaches far more of South Dakota than the tracks themselves touch. A portable battery unit is the faster, no-fuel way to bridge that outage.
What Jerauld County's figure does not tell you
Jerauld County's figure is county-wide, not address-specific. Jerauld County covers about 526 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. Jerauld County has about 1,689 residents.