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Average Number of Tornado Incidences per Year (U.S.)

North AmericaPhysical Environment

Tornado prevalence in the United States per 1,000 square miles per year

Tornado Archive

A 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.

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Average Number of Tornado Incidences per Year (U.S.)

Distribution of Calcium Carbonate in Modern Surface Sediments

Approximate Form and Extent of Outcrop of Carbonate Rocks

Ocean Climate Zones

Major Waterfalls and Cataracts

Less than 1

1–5

6–10

11–15

More than 15

0 - 20

20 - 40

40 - 60

60 - 80

80 - 100

Approximate Form and Extent of Outcrop of Carbonate Rocks

Equatorial

Tropical

Subtropical

Temperate

Subpolar

Alexandra Falls

Athabasca Falls

Baileys Chute

Celilo Falls

Cohoes Falls

Cumberland Falls

Great Falls

Kettle Falls

Kootenai Falls

Little Falls

Louise Falls

Marcus Falls

Niagara Falls

Osprey Falls

Rearguard Falls

Sandstone Falls

Sherars Falls

Vermilion Falls

Virginia Falls

Waterloo Falls

Willamette Falls

Arizona
92.2%7.76%
Utah
100%
District of Columbia
100%
Idaho
100%
New Hampshire
1.24%98.7%
Vermont
77.1%22.6%
Wyoming
87.7%12.3%
North Dakota
29.5%70.5%
Mississippi
10.9%74.0%15.1%
Nebraska
88.6%11.4%
Missouri
23.4%62.5%14.1%
New Mexico
90.2%9.71%
Wisconsin
13.1%53.1%33.7%
South Carolina
99.9%
Michigan
34.8%64.8%
Pennsylvania
6.15%93.9%
Colorado
69.4%30.6%
Nevada
100%
Arkansas
87.2%12.8%
South Dakota
22.1%76.0%1.85%
Ohio
3.97%96.0%
Indiana
62.9%37.1%
Minnesota
23.4%72.5%4.03%
Iowa
50.0%50.0%
Kansas
68.1%31.5%8.84%
Georgia
61.5%38.5%0.250%5.65%
Oklahoma
3.41%35.1%46.0%15.5%7.62%
Tennessee
41.3%58.7%0.744%
Illinois
70.3%29.6%4.93%
Alaska
99.8%0.671%2.05%0.827%
Florida
64.2%35.5%0.637%0.865%8.54%2.09%
Rhode Island
99.3%4.44%8.19%
Nunavut
4.30%
Maine
40.0%59.8%0.825%1.22%
Nova Scotia
3.14%8.68%
Delaware
99.2%2.57%4.66%
Prince Edward Island
19.7%54.8%
Texas
16.8%43.9%36.9%2.38%2.21%0.188%
Louisiana
30.4%69.5%3.62%
Hawaii
92.1%2.48%13.2%3.56%1.64%2.56%35.3%
North Carolina
99.9%1.08%2.25%
New Brunswick
0.602%2.16%
Alabama
69.5%16.4%14.0%0.128%
Newfoundland and Labrador
1.91%1.85%0.552%
New Jersey
19.5%80.3%1.77%3.26%
Connecticut
99.9%0.661%
Massachusetts
99.5%5.64%0.220%0.220%7.89%
Maryland
99.3%2.92%3.11%
Québec
0.264%0.352%
California
99.9%0.408%0.184%0.550%0.247%
Northwest Territories
1.67%111
Washington
99.9%1.05%0.763%1
Montana
100%1
Kentucky
4.42%60.5%35.1%1.28%1
Virginia
10.3%89.6%0.818%15.1%0.104%1.74%1
West Virginia
48.2%51.8%17.2%1
Oregon
100%0.120%0.245%11111
British Columbia
2.52%0.699%1.39%1111
Alberta
11
New York
61.6%38.3%3.00%1.81%1
Ontario
0.107%1
0.16.0