How Likely Is a Tornado in Grand Isle County, VT?
Grand Isle County's tornado history, by the numbers
In 76 years of NOAA/SPC tracking, Grand Isle County has no recorded tornado track. Zero is the honest answer here, not missing data. Put another way: Grand Isle County sees more tornado activity than 1% of US counties. Among 14 Vermont counties in this dataset, Grand Isle County ranks 14 for how often a tornado touches down.
Beyond the frequency band: violent history
0 weak and 0 significant tornadoes make up Grand Isle County's 0-track record - none violent. NOAA has never logged an EF4 or EF5 crossing this county.
The dollar figure Grand Isle County's rating leads to
Cost nationally: $2,890-$13,280, about $7,645 typical. Vermont 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 Vermont this pass.
What a direct hit isn't required for
A direct hit is not required for Grand Isle County to lose power - outbreak-wide outages across Vermont regularly reach homes and businesses well outside the actual tracks. A battery bank covers that gap without a generator's fuel and venting needs.
What this number is, and is not
One caveat before relying on Grand Isle County's number: it is county-wide, and it covers about 82 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. Grand Isle County has about 7,528 residents.