which rated tornadoes from F0 to F5, based on estimated wind speeds and observed damage. Then, in 2007, the weather service adopted the Enhanced Fujita scale, which better reflected actual storm ...

A tornado that hits a populated area can cause damage in the billions of dollars and cause fatalities. Here are six of the costliest U.S. tornadoes. The F5 tornado that chewed through Joplin, Missouri ...