Average Number of Tornado Incidences per Year (U.S.)
North AmericaPhysical EnvironmentTornado prevalence in the United States per 1,000 square miles per year
Tornado ArchiveA map shows average tornado incidences per year in the U.S. The highest incidences (dark brown) are in Oklahoma, parts of Texas, Kansas, and Missouri. The lowest incidences (light yellow) are in Alaska, Washington, Oregon, and California.
Less than 1 | 1–5 | 6–10 | 11–15 | More than 15 | -0.25 to 0.25 | 0.75 to 1.0 | 1.0 to 1.25 | 1.25 to 1.5 | 1.5 to 1.75 | Salt Marshes | Consolidated rock aquifers | Combination aquifers | Productive aquifers | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Vermont | 77.1% | 22.6% | ||||||||||||
Alaska | 99.8% | 0.318% | ||||||||||||
Hawaii | 92.1% | 1.74% | 1.20% | 0.113% | 0.444% | 2.10% | ||||||||
New Hampshire | 1.24% | 98.7% | 1.37% | |||||||||||
Rhode Island | 99.3% | 4.64% | 2.01% | |||||||||||
Maine | 40.0% | 59.8% | 0.133% | 0.322% | ||||||||||
Massachusetts | 99.5% | 1.78% | 3.30% | |||||||||||
Arizona | 92.2% | 7.76% | 5.15% | |||||||||||
Utah | 100% | 2.03% | ||||||||||||
Yukon | 83.0% | |||||||||||||
Northwest Territories | 37.6% | |||||||||||||
District of Columbia | 100% | 55.6% | ||||||||||||
Florida | 64.2% | 35.5% | 0.596% | 1.33% | 25.3% | 1.48% | ||||||||
Idaho | 100% | 1.85% | 6.13% | |||||||||||
Washington | 99.9% | 0.513% | 0.132% | 1.17% | ||||||||||
Wyoming | 87.7% | 12.3% | 3.58% | |||||||||||
Nunavut | 0.352% | 2.51% | ||||||||||||
Montana | 100% | 1.34% | ||||||||||||
North Dakota | 29.5% | 70.5% | 3.00% | 6.69% | ||||||||||
Kentucky | 4.42% | 60.5% | 35.1% | 8.30% | ||||||||||
Nova Scotia | 0.847% | 0.591% | 29.2% | |||||||||||
Virginia | 10.3% | 89.6% | 0.126% | 0.493% | 8.27% | |||||||||
Delaware | 99.2% | 0.762% | 33.7% | 98.6% | ||||||||||
Prince Edward Island | 1.25% | 0.264% | 1.22% | 77.5% | ||||||||||
Saskatchewan | 11.0% | |||||||||||||
Mississippi | 10.9% | 74.0% | 15.1% | 0.461% | 99.6% | |||||||||
West Virginia | 48.2% | 51.8% | 1.96% | |||||||||||
Nebraska | 88.6% | 11.4% | 75.9% | |||||||||||
Texas | 16.8% | 43.9% | 36.9% | 2.38% | 0.183% | 0.123% | 27.0% | |||||||
Missouri | 23.4% | 62.5% | 14.1% | 56.4% | ||||||||||
Louisiana | 30.4% | 69.5% | 0.184% | 0.106% | 98.6% | |||||||||
North Carolina | 99.9% | 0.319% | 0.191% | 7.59% | ||||||||||
Oregon | 100% | 1.21% | 1.53% | |||||||||||
New Brunswick | 0.522% | 0.488% | 50.2% | |||||||||||
Alabama | 69.5% | 16.4% | 14.0% | 0.174% | 4.32% | |||||||||
New Mexico | 90.2% | 9.71% | 4.90% | 2.15% | ||||||||||
Kansas | 68.1% | 31.5% | 1.62% | 5.11% | ||||||||||
Wisconsin | 13.1% | 53.1% | 33.7% | 12.5% | 1.43% | |||||||||
British Columbia | 2.52% | 0.126% | 0.160% | 59.8% | ||||||||||
Newfoundland and Labrador | 0.392% | 5.25% | ||||||||||||
New Jersey | 19.5% | 80.3% | 0.329% | 15.3% | 58.8% | |||||||||
South Carolina | 99.9% | 6.81% | 30.0% | 2.54% | ||||||||||
Michigan | 34.8% | 64.8% | 16.1% | 16.3% | ||||||||||
Alberta | 6.33% | |||||||||||||
Connecticut | 99.9% | 0.797% | 2.14% | |||||||||||
Pennsylvania | 6.15% | 93.9% | 11.6% | |||||||||||
Colorado | 69.4% | 30.6% | 2.33% | 2.58% | ||||||||||
Nevada | 100% | 1.63% | 2.87% | |||||||||||
Georgia | 61.5% | 38.5% | 2.72% | 2.57% | 17.9% | |||||||||
New York | 61.6% | 38.3% | 0.105% | 0.102% | 3.15% | |||||||||
Maryland | 99.3% | 0.874% | 0.178% | 34.3% | ||||||||||
Québec | 1.02% | |||||||||||||
Manitoba | 2.62% | |||||||||||||
Oklahoma | 3.41% | 35.1% | 46.0% | 15.5% | 1.97% | 2.69% | ||||||||
Tennessee | 41.3% | 58.7% | 17.6% | |||||||||||
Ontario | 5.05% | |||||||||||||
California | 99.9% | 0.110% | 0.156% | 4.23% | 1.35% | |||||||||
Arkansas | 87.2% | 12.8% | 15.9% | |||||||||||
South Dakota | 22.1% | 76.0% | 1.85% | 10.3% | 6.62% | |||||||||
Ohio | 3.97% | 96.0% | 15.0% | |||||||||||
Indiana | 62.9% | 37.1% | 11.6% | |||||||||||
Minnesota | 23.4% | 72.5% | 4.03% | 2.27% | 3.62% | |||||||||
Iowa | 50.0% | 50.0% | 2.05% | |||||||||||
Illinois | 70.3% | 29.6% | 33.0% | 3.68% | ||||||||||
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