EF5 tornado that killed 3 in North Dakota was the nation’s first in 12 years

Meteorologists from the National Weather Service office in Grand Forks estimated the tornado’s winds reached 210 mph, ...
Las Vegas Sun

EF5 tornadoes — the most powerful classification — rarely occur

Meteorologists said this week that a deadly tornado in North Dakota this summer has been upgraded to a top-of-the-scale EF5, ...

LIVE: Kristen’s Classroom: Tornado classification

Meteorologist Kristen Currie goes in-depth on the new findings of the U.S.' latest EF-5 tornado and why rating tornado strength is so different than other weather phenomena.