The Fujita Tornado Damage Scale

The Fujita Tornado Scale, usually referred to as the F-Scale, classifies tornadoes based on the resulting damage. This scale was developed by Dr. T. Theodore Fujita (University of Chicago) in 1971.

F040-72 mph
64-116 km/h
MINIMAL DAMAGE: Some damage to chimneys, TV antennas, roof shingles, trees, and windows.29%
F173-112 mph
117-180 km/h
MODERATE DAMAGE: Automobiles overturned, carports destroyed, trees uprooted.40%
F2113-157 mph
181-253 km/h
MAJOR DAMAGE: Roofs blown off homes, sheds and outbuildings demolished, mobile homes overturned.24%
F3158-206 mph
254-332 km/h
SEVERE DAMAGE: Exterior walls and roofs blown off homes. Metal buildings collapsed or are severely damaged. Forests and farmland flattened.6%
F4207-260 mph
333-418 km/h
DEVASTATING DAMAGE: Few walls, if any, standing in well-built homes. Large steel and concrete missiles thrown far distances.2%
F5261-318 mph
419-512 km/h
INCREDIBLE DAMAGE: Homes leveled with all debris removed. Schools, motels, and other larger structures have considerable damage with exterior walls and roofs gone. Top stories demolished.less than 1%