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.  F0 40-72 mph
64-116 km/h MINIMAL DAMAGE: Some damage to chimneys, TV
antennas, roof shingles, trees, and windows. 29% F1 73-112 mph
117-180 km/h MODERATE DAMAGE: Automobiles overturned, carports
destroyed, trees uprooted. 40% F2 113-157 mph 181-253 km/h MAJOR
DAMAGE: Roofs blown off homes, sheds and outbuildings
demolished, mobile homes overturned. 24% F3 158-206 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% F4 207-260 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% F5 261-318
mph 419-512 km/h INCREDIBLE DAMAGE: Homes leveled with all
debris removed. Schools, motels, and oth