Pennington County, SD Tornado Risk & Storm Shelter Cost
Pennington County, SD: what NOAA's tornado record says
Since 1953, NOAA has logged 50 tornado tracks crossing Pennington County - one about every 1.5 years, which lands it in our High band. Nationally, Pennington County ranks at the 88th percentile for tornado frequency. Within South Dakota alone, Pennington County ranks 4 of 66 counties for tornado frequency.
Pennington County's EF4-5 history
Pennington County's record has no EF4-5 tornado - its 50 tracks split 45 weak and 5 significant. That does not rule one out in the future, only that none has been recorded since 1950.
What a storm shelter costs near Pennington County
For a Pennington 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
Power loss after a tornado outbreak in South Dakota often reaches homes the storm itself never touched. A battery-backup unit covers the outage without the fuel and venting a generator needs.
Read this before you rely on it
This is a county-level figure, not a per-address probability. Pennington County covers about 2,777 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. Pennington County has about 115,979 residents.