How Likely Is a Tornado in Minnehaha County, SD?
How likely is a tornado in Minnehaha County, SD?
Minnehaha County has recorded 51 tornado touches in NOAA's 76-year database, a rate of roughly one every 1.5 years - our High band. Put another way: Minnehaha County sees more tornado activity than 89% of US counties. Among 66 South Dakota counties in this dataset, Minnehaha County ranks 3 for how often a tornado touches down.
Beyond the frequency band: violent history
1 tornado touching Minnehaha County reached violent (EF4-5) strength since 1950. That single fact carries more weight for the shelter decision than the county's overall frequency band.
The dollar figure Minnehaha 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
208,639 people live in Minnehaha 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 Minnehaha County's number: it is county-wide, and it covers about 807 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. Minnehaha County has about 208,639 residents.