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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

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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Display by:	Average Number of Tornado Incidences per Year (U.S.)					Distribution of Calcium Carbonate in Modern Surface Sediments					Tropical Forests	Insolation
	Less than 1	1–5	6–10	11–15	More than 15	0 - 20	20 - 40	40 - 60	60 - 80	80 - 100	Tropical Forests	240–259	220–239	200–219	180–199	160–179	140–159	120–139	100–119	80–99	Less than 80
Alaska	99.8%					0.671%													28.4%	69.2%	2.23%
Arizona	92.2%	7.76%										44.2%	33.7%	22.1%
Utah	100%													70.0%	8.89%	2.63%
Yukon																			100%
Northwest Territories																		2.63%	82.4%	14.9%
District of Columbia		100%														100%
Florida		64.2%	35.5%					0.637%		0.865%	1.15%		32.7%	67.3%
Idaho	100%															78.1%	21.9%
New Hampshire	1.24%	98.7%															100%
Rhode Island		99.3%				4.44%											100%
Vermont	77.1%	22.6%															100%
Washington	99.9%					1.05%										1.22%	98.8%
Wyoming	87.7%	12.3%													12.4%	87.6%
Nunavut																		1.36%	33.1%	65.5%
Montana	100%															14.7%	85.3%
Maine	40.0%	59.8%				0.825%											99.8%	0.153%
North Dakota	29.5%	70.5%															100%
Kentucky	4.42%	60.5%	35.1%												46.4%	53.6%
Nova Scotia						3.14%											52.4%	47.6%
Virginia	10.3%	89.6%				0.818%									2.49%	97.5%
Delaware		99.2%				2.57%										100%
Prince Edward Island						19.7%												100%
Saskatchewan																	42.7%	57.2%
Mississippi		10.9%	74.0%	15.1%										82.1%	17.9%
West Virginia	48.2%	51.8%														99.2%	0.827%
Nebraska		88.6%	11.4%												9.53%	90.5%
Texas	16.8%	43.9%	36.9%		2.38%							5.26%	58.9%	35.9%
Missouri		23.4%	62.5%	14.1%											66.4%	33.6%
Louisiana		30.4%	69.5%										26.8%	73.2%
Hawaii	92.1%					2.48%	13.2%		3.56%	1.64%			2.67%	97.3%
North Carolina		99.9%				1.08%									73.0%	27.0%
Oregon	100%					0.120%										96.3%	3.75%
New Brunswick						0.602%											47.2%	52.8%
Alabama		69.5%	16.4%	14.0%										66.2%	33.8%
New Mexico	90.2%	9.71%										15.5%	33.9%	49.1%
Kansas		68.1%	31.5%											5.90%	91.6%	2.46%
Wisconsin	13.1%	53.1%	33.7%														100%
British Columbia	2.52%					0.699%											21.7%	31.5%	46.8%
Newfoundland and Labrador						1.91%												29.5%	69.1%	1.36%
New Jersey	19.5%	80.3%				1.77%										51.6%	48.4%
South Carolina		99.9%													100%
Michigan	34.8%	64.8%															100%
Alberta																	29.7%	53.1%	17.2%
Connecticut		99.9%															100%
Pennsylvania	6.15%	93.9%														19.4%	80.6%
Colorado	69.4%	30.6%												48.1%	51.6%	0.332%
Nevada	100%												1.58%	63.4%	31.2%	3.86%
Massachusetts		99.5%				5.64%			0.220%						0.220%		99.8%
Georgia		61.5%	38.5%					0.250%						48.3%	51.7%
New York	61.6%	38.3%				3.00%											100%
Maryland		99.3%				2.92%										100%
Québec																	10.4%	38.5%	41.0%	10.1%
Manitoba																	26.0%	66.7%	7.35%
Oklahoma		3.41%	35.1%	46.0%	15.5%									82.2%	17.8%
Tennessee		41.3%	58.7%												100%
Ontario																	30.4%	56.0%	13.7%
California	99.9%					0.408%	0.184%					2.69%	22.7%	49.4%	19.9%	5.25%
Arkansas			87.2%	12.8%										50.1%	49.9%
South Dakota	22.1%	76.0%	1.85%													50.1%	49.9%
Ohio	3.97%	96.0%														51.6%	48.4%
Indiana		62.9%	37.1%												0.561%	79.2%	20.2%
Minnesota	23.4%	72.5%	4.03%														99.9%
Iowa		50.0%	50.0%													77.7%	22.3%
Illinois		70.3%	29.6%												11.8%	73.8%	14.4%

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