The most rare and extreme form of tornado struck eastern North Dakota in June, but experts just determined how strong it ...

The National Weather Service said the EF5 twister in North Dakota packed winds stronger than 200 mph, underscoring risks that ...

The nation's longest "drought" between EF5 tornadoes has come to an end, scientists from the National Weather Service ...

Three people were killed in the tornado, which produced 210 mph winds, leveling homes and tossing fully-loaded box cars.

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.

After over 12 years, the EF5 tornado drought in the U.S. has come to an end. A tornado that struck Enderlin, North Dakota, in June was just upgraded to an EF5. Find the details here.

The first EF5 tornado was confirmed in North Dakota, here's a history and the last F5 tornadoes to hit Michigan.