A rare, monstrous EF5 tornado that struck the United States more than three months ago was the first of its kind in more than a decade, experts announced Monday.
A tornado that roared through part of eastern North Dakota in June and killed three people was upgraded Monday to an EF5 with winds greater than 210 mph, the National Weather Service in Grand Forks, North Dakota, confirmed.
EF5 tornadoes pack winds of at least 201 mph and are the highest level of the Enhanced Fujita Scale, the scale used to determine tornado strength. Tornadoes this strong are rare. Only 60 tornadoes of EF5 strength – including this one – have been recorded since 1950, according to NOAA’s Storm Prediction Center.
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