CLASSES

The Fujita-Pearson Scale measures tornadoes through wind speed:

F 0; Gale Tornado
[Wind speeds 40-72 mph]
Structures are minorly damaged, tree branches may break off, and small trees uprooted. Large signs aer damaged.

F 1; Moderate Tornado
[Wind speeds 73-112 mph]
Relatively the speed of the hurricane, tornadoes at this speed can rip the roof surfaces off a house, and mobile homes are overturned. Car pushed off the road.

F 2; Significant Tornado
[Wind speeds 113-157 mph]
Area suffers extensive damage, roofs torn off frame houses. Mobile homes
are destroyed. Large trees torn from the ground and snapped. Light objects become deadly missiles.

F 3; Severe Tornado
[Wind speeds 158-206 mph]
Roofs of well built houses are ripped off. Numerous trees ripped out of the earth. Trains are overturned.

F 4; Devastating Tornado
[Wind speeds 207-260 mph]
Well build houses are totally destroyed. Newly build houses are thrown considerable distances. Cars thrown and other large objects become deadly projectiles.

F 5; Incredible Tornado
[Wind speeds 261-318 mph]
Well built houses are torn out of the ground and thrown great distances. Trees become debarked, and car size missles fly up to one hundred meters. Steel reinforced concrete structures are badly damaged.

F 6; Inconceivable Tornado
[Wind speeds 319-379 mph]
Tornadoes at these speeds are highly unlikely, but if a tornado this big
did occur, the wreakage would be so great it would be unidentifiable. Everything and anything can and will be destroyed.