Brown County, SD Tornado Risk & Storm Shelter Cost
Brown County's tornado history, by the numbers
Since 1955, NOAA has logged 86 tornado tracks crossing Brown County - one about every 0.9 years, which lands it in our High band. Nationally, Brown County ranks at the 97th percentile for tornado frequency. South Dakota has 66 counties in this dataset; Brown County ranks 1 of them by frequency.
Brown County's EF4-5 history
Brown County has 1 violent (EF4-5) tornado on record. FEMA centers its safe-room case on exactly this strength, not on how often a county gets touched - a hardened room is the difference between a code-built house surviving an EF4-5 or not.
What a storm shelter costs near Brown County
For a Brown County homeowner, budget $2,890-$13,280 for a shelter or safe room ($7,645 typical) - this pass found no South Dakota-specific rebate on top of FEMA's underlying 75% national cost-share program.
The outage nobody plans for
37,495 people live in Brown 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.
Read this before you rely on it
This is a county-level figure, not a per-address probability. Brown County covers about 1,713 square miles, so a single touch here counts the same as a single touch in a county a fraction of that size. Pre-radar-era records (before the 1990s) are also documented by NOAA as undercounting weaker tornadoes in sparsely-instrumented areas. Brown County has about 37,495 residents.