It's been 12 years since the historic, deadly Moore, Oklahoma, EF5 tornado. New research has given light as to why no U.S. tornado has achieved an EF5 rating since.

Twelve years ago, the last EF5 tornado to hit the United States tore through Moore, Oklahoma. The violent storm carved a path of destruction through neighborhoods, killing 24 people and injuring ...

Reports show nine tornadoes touched down in El Reno, Yukon, Mustang, near Moore, Del City, Watova and Oklahoma City. The El Reno storm was the widest recorded tornado, 2.6 miles, in United States ...

Twelve years ago, the last EF5 tornado to hit the United States tore through Moore, Oklahoma. The violent storm carved a path of destruction through neighborhoods, killing 24 people and injuring ...

Despite roughly 1,200 tornadoes occurring every year, May 20, 2013, in Moore, Oklahoma, was the last time a tornado received the maximum damage rating.

Twelve years ago, the last EF5 tornado to hit the United States tore through Moore, Oklahoma. The violent storm carved a path of destruction through neighborhoods, killing 24 people and injuring ...