Tornado Risk in Lawrence County, SD
Lawrence County's tornado history, by the numbers
20 tornado tracks have crossed Lawrence County since 1953 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. Within South Dakota alone, Lawrence County ranks 53 of 66 counties for tornado frequency.
The number that matters more than frequency
No violent (EF4-5) tornado has been recorded in Lawrence County in NOAA's 76-year database. Of its 20 recorded tracks, 15 were weak (EF0-1) and 5 significant (EF2-3).
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 Lawrence County homeowner should expect the full national range: $2,890-$13,280, $7,645 typical.
Power after the storm, not just shelter during it
Tornado outbreaks routinely knock out power across South Dakota for days, separately from any single house getting hit. A portable battery bank keeps a fridge, phone chargers and a radio running through that gap - cheaper and faster to set up than a generator.
What Lawrence County's figure does not tell you
Lawrence County's figure is county-wide, not address-specific. Lawrence County covers about 800 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. Lawrence County has about 28,809 residents.