How Likely Is a Tornado in Cass County, ND?
Cass County's tornado history, by the numbers
Cass County has recorded 106 tornado touches in NOAA's 76-year database, a rate of roughly one every 0.7 years - our High band. Put another way: Cass County sees more tornado activity than 99% of US counties. Among 53 North Dakota counties in this dataset, Cass County ranks 1 for how often a tornado touches down.
Beyond the frequency band: violent history
1 tornado touching Cass 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 Cass 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
Tornado outbreaks routinely knock out power across North 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 this number is, and is not
One caveat before relying on Cass County's number: it is county-wide, and it covers about 1,765 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. Cass County has about 200,945 residents.