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

Thunderstorms erupting in the South and Midwest to kick off the weekend could turn severe and produce dangerous winds, a few tornadoes and heavy rain.

ENDERLIN, N.D. (AP) - 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 ...

(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 ...