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

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

The last recorded EF5 tornado was on May 20, 2013, in a town outside Oklahoma City, killing 24 people and injuring more than 200 others. That tornado tore through hundreds of homes, a school, hospital ...

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

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.

For the first time in 12 years, the United States has recorded an EF5 tornado, the most powerful type of twister on the Enhanced Fujita wind and damage scale, the National Weather Service confirmed ...

NORTH DAKOTA Deadly tornado classified EF5 A deadly tornado that tore across southeastern North Dakota this summer has been ...

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

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 ...