Three people were killed in the tornado, which produced 210 mph winds, leveling homes and tossing fully-loaded box cars.
A deadly tornado that tore across southeastern North Dakota this summer has been upgraded to an EF5 with winds topping 200 ...
The first EF5 tornado was confirmed in North Dakota, here's a history and the last F5 tornadoes to hit Michigan.
Meteorologists said this week that a deadly tornado in North Dakota this summer has been upgraded to a top-of-the-scale EF5, and was the first on American soil in 12 years.
Tornado experts upgraded the deadly June 20 North Dakota twister to the rarest, strongest rating: EF5. With winds over 210 mph, it's the first in the U.S. in years.