Tornado Risk in Williamsburg County, SC
Williamsburg County, SC: what NOAA's tornado record says
14 tornado tracks have crossed Williamsburg County since 1962 by NOAA's count, roughly one every 5.4 years - the Low band on this site's scale. That is the 39th percentile nationally for tornado frequency. South Carolina has 46 counties in this dataset; Williamsburg County ranks 41 of them by frequency.
The number that matters more than frequency
No violent (EF4-5) tornado has been recorded in Williamsburg County in NOAA's 76-year database. Of its 14 recorded tracks, 13 were weak (EF0-1) and 1 significant (EF2-3).
Shelter and safe-room economics
South Carolina does not currently have a confirmed state rebate layered on top of FEMA's 75% Hazard Mitigation cost-share, so a Williamsburg 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 Williamsburg County outright can still take its power out - outbreak-scale outages across South Carolina are common well beyond the tracked path. A battery-backup unit handles that without a generator's setup or fuel.
Wind damage may need its own endorsement
South Carolina is one of a handful of states where insurers can write wind/hail damage out of a standard homeowners policy - tornado damage may not be fully covered without a separate wind endorsement. Worth confirming directly on a Williamsburg County policy rather than assuming it is included.
What Williamsburg County's figure does not tell you
Williamsburg County's figure is county-wide, not address-specific. Williamsburg County covers about 934 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. Williamsburg County has about 29,865 residents.