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%) | Lowest hazard | Low hazard | Moderately low hazard | Moderate hazard | Moderately high hazard | High hazard | Highest hazard | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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% | |||||||||||||||||||
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% | |||||||||||||||||
Alaska | 99.8% | 0.132% | 87.9% | 0.193% | 0.154% | 1.32% | 2.85% | 1.92% | 2.33% | 38.6% | 2.01% | 5.60% | 5.27% | |||||||
Arizona | 92.2% | 7.76% | 3.34% | 9.37% | 6.97% | 0.448% | 4.52% | 6.30% | 79.1% | 4.42% | ||||||||||
Utah | 100% | 20.8% | 13.7% | 0.313% | 0.420% | 49.5% | 12.7% | 56.8% | 6.12% | 1.39% | ||||||||||
District of Columbia | 100% | 100% | 100% | |||||||||||||||||
Florida | 64.2% | 35.5% | 1.15% | 10.4% | 12.0% | 0.279% | 0.266% | 0.590% | 87.3% | 10.9% | ||||||||||
Idaho | 100% | 0.772% | 13.8% | 28.4% | 8.83% | 44.9% | 2.22% | 24.8% | 28.3% | 9.56% | ||||||||||
New Hampshire | 1.24% | 98.7% | 17.2% | 33.7% | 40.5% | 8.46% | 39.4% | 60.3% | ||||||||||||
Rhode Island | 99.3% | 0.183% | 86.5% | 6.09% | 93.7% | |||||||||||||||
Vermont | 77.1% | 22.6% | 7.27% | 88.3% | 4.41% | 81.9% | 18.1% | |||||||||||||
Washington | 99.9% | 72.6% | 3.37% | 5.42% | 0.287% | 6.53% | 25.6% | 38.5% | 19.2% | 5.52% | 10.1% | |||||||||
Wyoming | 87.7% | 12.3% | 21.7% | 0.541% | 70.3% | 5.20% | 20.2% | 63.6% | 8.78% | |||||||||||
Montana | 100% | 28.7% | 2.60% | 14.6% | 5.24% | 35.2% | 20.1% | 5.22% | 15.0% | 22.0% | 2.02% | |||||||||
Maine | 40.0% | 59.8% | 94.9% | 2.65% | 0.228% | 0.817% | 63.3% | 7.54% | ||||||||||||
North Dakota | 29.5% | 70.5% | 7.38% | 3.22% | 4.45% | 0.249% | 9.67% | 36.7% | 98.6% | 1.38% | ||||||||||
Kentucky | 4.42% | 60.5% | 35.1% | 76.6% | 17.7% | 5.68% | 7.69% | 64.8% | 10.2% | 7.55% | 1.03% | 3.57% | ||||||||
Virginia | 10.3% | 89.6% | 11.9% | 0.775% | 16.4% | 1.64% | 1.50% | 39.8% | 49.9% | 5.34% | ||||||||||
Delaware | 99.2% | 0.105% | 37.7% | 61.1% | 80.2% | 18.7% | ||||||||||||||
Mississippi | 10.9% | 74.0% | 15.1% | 74.5% | 1.57% | 23.9% | 46.6% | 33.2% | 16.6% | 3.37% | ||||||||||
West Virginia | 48.2% | 51.8% | 63.6% | 17.6% | 14.6% | 66.8% | 33.2% | |||||||||||||
Nebraska | 88.6% | 11.4% | 0.605% | 3.54% | 22.3% | 73.5% | 33.8% | 2.42% | 1.45% | |||||||||||
Texas | 16.8% | 43.9% | 36.9% | 2.38% | 4.07% | 3.41% | 2.84% | 1.94% | 22.5% | 2.71% | 54.2% | 29.7% | 7.88% | |||||||
Missouri | 23.4% | 62.5% | 14.1% | 45.5% | 14.9% | 0.131% | 5.37% | 8.53% | 41.8% | 23.6% | 11.8% | 7.42% | 1.26% | 5.55% | ||||||
Louisiana | 30.4% | 69.5% | 54.5% | 20.6% | 5.75% | 6.85% | 90.8% | 1.03% | ||||||||||||
Hawaii | 92.1% | 7.82% | 7.50% | 6.67% | 9.71% | 4.93% | 52.2% | |||||||||||||
North Carolina | 99.9% | 0.116% | 12.2% | 54.7% | 3.14% | 0.982% | 5.87% | 47.3% | 35.4% | 9.17% | 1.38% | |||||||||
Oregon | 100% | 14.3% | 48.2% | 11.8% | 4.82% | 0.772% | 0.847% | 1.50% | 41.7% | 13.0% | 4.40% | 4.75% | ||||||||
Alabama | 69.5% | 16.4% | 14.0% | 92.6% | 5.45% | 0.987% | 2.82% | 40.6% | 43.3% | 7.23% | ||||||||||
New Mexico | 90.2% | 9.71% | 30.3% | 0.128% | 7.32% | 21.7% | 7.73% | 4.90% | 54.5% | 8.67% | ||||||||||
Kansas | 68.1% | 31.5% | 0.176% | 1.82% | 13.8% | 68.4% | 42.9% | 9.98% | ||||||||||||
Wisconsin | 13.1% | 53.1% | 33.7% | 5.67% | 25.0% | 40.8% | 9.68% | 95.7% | 4.01% | |||||||||||
British Columbia | 2.52% | 92.0% | 1.55% | 0.285% | 2.06% | |||||||||||||||
New Jersey | 19.5% | 80.3% | 0.162% | 3.07% | 94.0% | 1.76% | 17.9% | 69.2% | 10.9% | |||||||||||
South Carolina | 99.9% | 0.748% | 24.6% | 36.2% | 22.6% | 58.4% | 8.92% | 2.25% | 7.66% | |||||||||||
Michigan | 34.8% | 64.8% | 56.0% | 3.00% | 4.63% | 9.70% | 74.0% | 24.1% | ||||||||||||
Connecticut | 99.9% | 0.460% | 29.6% | 24.9% | 23.8% | 1.35% | 98.9% | |||||||||||||
Pennsylvania | 6.15% | 93.9% | 1.42% | 27.8% | 49.9% | 3.96% | 85.9% | 14.1% | ||||||||||||
Colorado | 69.4% | 30.6% | 0.795% | 9.40% | 85.2% | 5.33% | 26.1% | 34.0% | 32.6% | |||||||||||
Nevada | 100% | 8.21% | 0.731% | 1.40% | 0.413% | 2.80% | 24.0% | 6.24% | 61.7% | 15.9% | 6.20% | 1.29% | ||||||||
Massachusetts | 99.5% | 0.206% | 0.166% | 33.6% | 8.30% | 30.7% | 79.0% | 15.4% | ||||||||||||
Georgia | 61.5% | 38.5% | 8.71% | 47.0% | 37.9% | 4.38% | 39.2% | 43.9% | 10.4% | 1.79% | ||||||||||
New York | 61.6% | 38.3% | 25.4% | 5.89% | 56.3% | 5.19% | 0.401% | 31.8% | 35.5% | 13.6% | 7.01% | |||||||||
Maryland | 99.3% | 0.151% | 4.45% | 64.3% | 1.05% | 8.49% | 87.1% | 10.7% | ||||||||||||
Oklahoma | 3.41% | 35.1% | 46.0% | 15.5% | 11.4% | 5.60% | 4.28% | 17.9% | 30.0% | 43.3% | 42.2% | 13.7% | ||||||||
Tennessee | 41.3% | 58.7% | 90.1% | 5.50% | 28.9% | 15.6% | 11.5% | 1.92% | 8.15% | |||||||||||
California | 99.9% | 0.688% | 12.5% | 0.232% | 17.8% | 2.26% | 1.00% | 3.21% | 9.22% | 1.48% | 1.10% | 28.4% | ||||||||
Arkansas | 87.2% | 12.8% | 12.6% | 46.8% | 33.2% | 6.01% | 17.3% | 39.7% | 21.2% | 1.93% | 2.11% | 7.50% | ||||||||
South Dakota | 22.1% | 76.0% | 1.85% | 32.7% | 3.47% | 37.3% | 22.0% | 27.5% | 53.6% | 8.87% | ||||||||||
Ohio | 3.97% | 96.0% | 3.42% | 0.721% | 29.0% | 85.3% | 2.10% | 1.52% | ||||||||||||
Indiana | 62.9% | 37.1% | 0.434% | 1.19% | 8.61% | 4.78% | 50.5% | 36.9% | 9.25% | 3.12% | ||||||||||
Minnesota | 23.4% | 72.5% | 4.03% | 21.0% | 3.81% | 13.1% | 23.4% | 22.0% | 99.1% | |||||||||||
Iowa | 50.0% | 50.0% | 26.6% | 12.5% | 44.0% | 16.3% | 0.628% | 92.6% | 7.45% | |||||||||||
Illinois | 70.3% | 29.6% | 30.9% | 0.187% | 44.1% | 9.75% | 52.5% | 18.5% | 13.6% | 11.9% | 1.07% | 1.91% |
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