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 | Tropical Forests | No data | Arid and low water use | Low (<10%) | Low-medium (10-20%) | Medium-high (20-40%) | High (40-80%) | Extremely high (>80%) | Value | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Yukon | 0.923% | 99.0% | ||||||||||||
Northwest Territories | 0.342% | 3.62% | ||||||||||||
Nunavut | 0.979% | 18.2% | ||||||||||||
Nova Scotia | 0.182% | 80.1% | ||||||||||||
Prince Edward Island | 98.5% | |||||||||||||
Saskatchewan | 4.25% | 59.9% | 2.62% | 2.54% | 2.67% | 0.868% | ||||||||
New Brunswick | 99.5% | |||||||||||||
British Columbia | 2.52% | 92.0% | 1.55% | 0.285% | ||||||||||
Newfoundland and Labrador | 74.5% | |||||||||||||
Alberta | 3.52% | 56.8% | 0.267% | 4.01% | 3.67% | 11.4% | ||||||||
Québec | 99.1% | 0.240% | ||||||||||||
Manitoba | 0.656% | 83.1% | 11.7% | 2.04% | 1.39% | |||||||||
Ontario | 97.2% | 1.67% | 1.13% | |||||||||||
Alabama | 69.5% | 16.4% | 14.0% | 92.6% | 5.45% | 0.987% | Bush (R) | |||||||
Alaska | 99.8% | 0.132% | 87.9% | 0.193% | 0.154% | 1.32% | Bush (R) | |||||||
Arizona | 92.2% | 7.76% | 3.34% | 9.37% | 6.97% | 0.448% | 4.52% | Bush (R) | ||||||
Arkansas | 87.2% | 12.8% | 12.6% | 46.8% | 33.2% | 6.01% | Bush (R) | |||||||
California | 99.9% | 0.688% | 12.5% | 0.232% | 17.8% | 2.26% | 1.00% | Kerry (D) | ||||||
Colorado | 69.4% | 30.6% | 0.795% | 9.40% | 85.2% | Bush (R) | ||||||||
Connecticut | 99.9% | 0.460% | 29.6% | 24.9% | 23.8% | 1.35% | Kerry (D) | |||||||
Delaware | 99.2% | 0.105% | 37.7% | 61.1% | Kerry (D) | |||||||||
District of Columbia | 100% | 100% | Kerry (D) | |||||||||||
Florida | 64.2% | 35.5% | 1.15% | 10.4% | 12.0% | 0.279% | 0.266% | 0.590% | Bush (R) | |||||
Georgia | 61.5% | 38.5% | 8.71% | 47.0% | 37.9% | Bush (R) | ||||||||
Hawaii | 92.1% | 7.82% | Kerry (D) | |||||||||||
Idaho | 100% | 0.772% | 13.8% | 28.4% | 8.83% | 44.9% | Bush (R) | |||||||
Illinois | 70.3% | 29.6% | 30.9% | 0.187% | 44.1% | 9.75% | Kerry (D) | |||||||
Indiana | 62.9% | 37.1% | 0.434% | 1.19% | 8.61% | 4.78% | Bush (R) | |||||||
Iowa | 50.0% | 50.0% | 26.6% | 12.5% | 44.0% | 16.3% | 0.628% | Bush (R) | ||||||
Kansas | 68.1% | 31.5% | 0.176% | 1.82% | 13.8% | 68.4% | Bush (R) | |||||||
Kentucky | 4.42% | 60.5% | 35.1% | 76.6% | 17.7% | 5.68% | Bush (R) | |||||||
Louisiana | 30.4% | 69.5% | 54.5% | 20.6% | 5.75% | Bush (R) | ||||||||
Maine | 40.0% | 59.8% | 94.9% | 2.65% | 0.228% | 0.817% | Kerry (D) | |||||||
Maryland | 99.3% | 0.151% | 4.45% | 64.3% | 1.05% | 8.49% | Kerry (D) | |||||||
Massachusetts | 99.5% | 0.206% | 0.166% | 33.6% | 8.30% | 30.7% | Kerry (D) | |||||||
Michigan | 34.8% | 64.8% | 56.0% | 3.00% | 4.63% | 9.70% | Kerry (D) | |||||||
Minnesota | 23.4% | 72.5% | 4.03% | 21.0% | 3.81% | 13.1% | 23.4% | 22.0% | Kerry (D) | |||||
Mississippi | 10.9% | 74.0% | 15.1% | 74.5% | 1.57% | 23.9% | Bush (R) | |||||||
Missouri | 23.4% | 62.5% | 14.1% | 45.5% | 14.9% | 0.131% | 5.37% | Bush (R) | ||||||
Montana | 100% | 28.7% | 2.60% | 14.6% | 5.24% | 35.2% | Bush (R) | |||||||
Nebraska | 88.6% | 11.4% | 0.605% | 3.54% | 22.3% | 73.5% | Bush (R) | |||||||
Nevada | 100% | 8.21% | 0.731% | 1.40% | 0.413% | 2.80% | 24.0% | Bush (R) | ||||||
New Hampshire | 1.24% | 98.7% | 17.2% | 33.7% | 40.5% | 8.46% | Kerry (D) | |||||||
New Jersey | 19.5% | 80.3% | 0.162% | 3.07% | 94.0% | 1.76% | Kerry (D) | |||||||
New Mexico | 90.2% | 9.71% | 30.3% | 0.128% | 7.32% | 21.7% | Bush (R) | |||||||
New York | 61.6% | 38.3% | 25.4% | 5.89% | 56.3% | 5.19% | 0.401% | Kerry (D) | ||||||
North Carolina | 99.9% | 0.116% | 12.2% | 54.7% | 3.14% | 0.982% | Bush (R) | |||||||
North Dakota | 29.5% | 70.5% | 7.38% | 3.22% | 4.45% | 0.249% | 9.67% | 36.7% | Bush (R) | |||||
Ohio | 3.97% | 96.0% | 3.42% | 0.721% | 29.0% | Bush (R) | ||||||||
Oklahoma | 3.41% | 35.1% | 46.0% | 15.5% | 11.4% | 5.60% | 4.28% | 17.9% | 30.0% | Bush (R) | ||||
Oregon | 100% | 14.3% | 48.2% | 11.8% | 4.82% | 0.772% | 0.847% | Kerry (D) | ||||||
Pennsylvania | 6.15% | 93.9% | 1.42% | 27.8% | 49.9% | 3.96% | Kerry (D) | |||||||
Rhode Island | 99.3% | 0.183% | 86.5% | 6.09% | Kerry (D) | |||||||||
South Carolina | 99.9% | 0.748% | 24.6% | 36.2% | Bush (R) | |||||||||
South Dakota | 22.1% | 76.0% | 1.85% | 32.7% | 3.47% | 37.3% | 22.0% | Bush (R) | ||||||
Tennessee | 41.3% | 58.7% | 90.1% | 5.50% | Bush (R) | |||||||||
Texas | 16.8% | 43.9% | 36.9% | 2.38% | 4.07% | 3.41% | 2.84% | 1.94% | 22.5% | 2.71% | Bush (R) | |||
Utah | 100% | 20.8% | 13.7% | 0.313% | 0.420% | 49.5% | Bush (R) | |||||||
Vermont | 77.1% | 22.6% | 7.27% | 88.3% | 4.41% | Kerry (D) | ||||||||
Virginia | 10.3% | 89.6% | 11.9% | 0.775% | 16.4% | 1.64% | Bush (R) | |||||||
Washington | 99.9% | 72.6% | 3.37% | 5.42% | 0.287% | 6.53% | Kerry (D) | |||||||
West Virginia | 48.2% | 51.8% | 63.6% | 17.6% | 14.6% | Bush (R) | ||||||||
Wisconsin | 13.1% | 53.1% | 33.7% | 5.67% | 25.0% | 40.8% | 9.68% | Kerry (D) | ||||||
Wyoming | 87.7% | 12.3% | 21.7% | 0.541% | 70.3% | Bush (R) | ||||||||
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