How Likely Is a Tornado in Sioux County, ND?
Sioux County, ND: what NOAA's tornado record says
Sioux County has recorded 17 tornado touches in NOAA's 76-year database, a rate of roughly one every 4.5 years - our Moderate band. Put another way: Sioux County sees more tornado activity than 44% of US counties. Within North Dakota alone, Sioux County ranks 45 of 53 counties for tornado frequency.
Beyond the frequency band: violent history
17 weak and 0 significant tornadoes make up Sioux County's 17-track record - none violent. NOAA has never logged an EF4 or EF5 crossing this county.
The dollar figure Sioux County's rating leads to
Cost nationally: $2,890-$13,280, about $7,645 typical. North 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 North Dakota this pass.
What a direct hit isn't required for
3,713 people live in Sioux County, and a tornado outbreak's power loss usually reaches far more of North 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 Sioux County's number: it is county-wide, and it covers about 1,094 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. Sioux County has about 3,713 residents.