One rating, multiple dimensions Like its counterpart scales for tornadoes and hurricanes, the AR Scale has five categories, ranging in this case from Cat 1 (weak) to Cat 5 (exceptional).

A tornado rated an EF-3 (out of 5) is potentially as destructive in Nashville as it is in Pittsburgh. A Category 2 hurricane threatening Tampa will have impacts similar to a Category 2 hurricane ...

The scale ranks storms from 1, Notable; 2, Significant; 3, Major; 4, Crippling and 5, Extreme. Developed by Paul Kocin, a winter storms expert at The Weather Channel, and Louis Uccellini, director ...