Before this twister was upgraded, the last EF5 in the United States had occurred in 2013 when a devastating tornado in Moore, Okla., killed 24 people. While North Dakota is far from Tornado Alley's ...

Some might think the Enhanced Fujita (EF) Scale is basically the same as the original Fujita (F) Scale, but Big Country ...

(CNN) — 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 ...

Damage surveys released late Wednesday night reveal more details about the two tornadoes that struck East Texas on Tuesday ...

Meteorologists say 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 ...

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.

A deadly tornado that tore across southeastern North Dakota this summer has been upgraded to an EF5 with winds topping 200 mph (322 kph), the strongest classification of tornado and the first ...