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Tornadoes per Decade
Source NOAA NCEI climate divisional dataset, 1991-2020 normals Provenance US federal agency · primary Agency National Oceanic and Atmospheric Administration Years 2020 Unit per 1,000 square miles Geography County (3,090 published) Counted among County land area Coverage 96% of counties Highest Pinellas County, Florida, 72.6 Lowest Utuado Municipio, Puerto Rico, 0.0 Tornadoes touching the county per decade, per 1,000 square miles, 1950 to 2023. Reporting has improved over that period, so weak tornadoes are recorded far more often now than in the 1950s.
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Highest counties
County Tornadoes per Decade Pinellas County, Florida 72.6 Galveston County, Texas 44.2 Jefferson Parish, Louisiana 28.3 Cleveland County, Oklahoma 25.8 Oklahoma County, Oklahoma 24.6 Tulsa County, Oklahoma 23.0 New Hanover County, North Carolina 22.5 Lee County, Florida 22.1 Lafayette Parish, Louisiana 21.6 Adams County, Colorado 21.4 Sarasota County, Florida 20.9 Carteret County, North Carolina 20.8
Lowest counties
County Tornadoes per Decade Utuado Municipio, Puerto Rico 0.0 Ponce Municipio, Puerto Rico 0.0 Webster County, West Virginia 0.0 Pocahontas County, West Virginia 0.0 Mingo County, West Virginia 0.0 Logan County, West Virginia 0.0 Hardy County, West Virginia 0.0 Clay County, West Virginia 0.0 Calhoun County, West Virginia 0.0 Boone County, West Virginia 0.0 Wahkiakum County, Washington 0.0 Skamania County, Washington 0.0
Counted among: County land area