The United States has the greatest number of tornadoes of any nation. More twisters of EF-1 or greater intensity are occurring despite tornadoes occurring on fewer days per year, according to tornado researchers.

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The average tornado rotates up to a speed of 110 miles an hour, measures about 250 feet across and travels a few miles.

For more on how climate change might be affecting America's tornado alley, read here.

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