How Likely Is a Tornado in Sanborn County, SD?
Sanborn County's tornado history, by the numbers
Sanborn County has recorded 23 tornado touches in NOAA's 76-year database, a rate of roughly one every 3.3 years - our Moderate band. Put another way: Sanborn County sees more tornado activity than 55% of US counties. Among 66 South Dakota counties in this dataset, Sanborn County ranks 45 for how often a tornado touches down.
Beyond the frequency band: violent history
18 weak and 5 significant tornadoes make up Sanborn County's 23-track record - none violent. NOAA has never logged an EF4 or EF5 crossing this county.
The dollar figure Sanborn County's rating leads to
Cost nationally: $2,890-$13,280, about $7,645 typical. South Dakota has no state rebate program confirmed here; FEMA's underlying 75% cost-share exists nationwide, but applying through a state program is what usually makes it real, and none was found for South Dakota this pass.
What a direct hit isn't required for
2,392 people live in Sanborn 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 this number is, and is not
One caveat before relying on Sanborn County's number: it is county-wide, and it covers about 569 square miles, so a single touch counts the same as one in a county a fraction of that size. Weaker pre-1990s tornadoes are also documented as undercounted in NOAA's own record. Sanborn County has about 2,392 residents.