The worst type of tornado hasn't hit the US for over a decade, perplexing experts
Researches found little evidence that tornadoes were getting weaker. Instead, it appears that a subjective tornado grading ...
USA Today7d
The worst type of tornado hasn't hit the US for over a decade, perplexing experts
May 20, 2013, marks the last time the United States was hit by the worst type of tornado. On that date, a monster EF5 tornado tore a 17-mile path through the Oklahoma City suburbs, creating "40 ...