Building on the excitement surrounding last year's incident command system simulation, undergraduate students in ... This year, James Spann announced that an F5 tornado touched down in Anytown, USA, ...

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 ...

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 ...

Here are six of the costliest U.S. tornadoes. The F5 tornado that chewed through Joplin, Missouri, in 2011 remains the costliest twister in U.S. history. The tornado, which claimed over 150 lives, ...