The Enhanced Fujita Scale is used to determine the severity of tornadoes: from an EF-0, the weakest, to an EF-5, the strongest. Wind speeds and damage are the main components to rating a storm.

Instead, after a tornado hits, the U.S. National Weather Service uses a rating system it adopted in 1973 called the Fujita Scale. Devised by meteorologist Theodore Fujita in 1970, the F-scale ...