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The Fujita Scale is used to rate the intensity of a tornado
by examining the damage caused by the tornado after it
has passed over a man-made structure.

Fujita Scale

Level of
Intensity Wind Speed Description of Damage

F-0
Gale
Tornado 40-72 mph Some damage to chimneys; breaks
branches off trees; pushes over
shallow-rooted trees; damages sign
boards.

F-1
Moderate
Tornado 73-112 mph The lower limit is the beginning of
hurricane wind speed; peels surface
off roofs; mobile homes pushed off
foundations or overturned; moving
autos pushed off the roads;
attached garages may be destroyed.

F-2
Significant
Tornado 113-157 mph Considerable damage. Roofs torn
off frame houses; mobile homes
demolished; boxcars pushed over;
large trees snapped or uprooted;
light object missiles generated.

F-3
Severe
Tornado 158-206 mph Roof and some walls torn off well
constructed houses; trains
overturned; most trees in forest
uprooted

F-4
Devastating
Tornado 207-260 mph Well-constructed houses leveled;
structures with weak foundations
blown off some distance; cars
thrown and large missiles
generated.

F-5
Incredible
Tornado 261-318 mph Strong frame houses lifted off
foundations and carried
considerable distances to
disintegrate; automobile sized
missiles fly through the air in
excess of 100 meters; trees
debarked; steel re-inforced
concrete structures badly damaged.

F-6
Inconceivable
Tornado 319-379 mph These winds are very unlikely.
The small area of damage they might
produce would probably not be recognizable
along with the mess produced by F4 and F5
wind that would surround the F6 winds.
Missiles, such as cars and refrigerators
would do serious secondary damage that
could not be directly identified as
F6 damage. If this level is ever achieved,
evidence for it might only be found
in some manner of ground swirl pattern,
for it may never be identifiable
through engineering studies.

Fujita Scale
Level of Intensity	Wind Speed	Description of Damage
F-0 Gale Tornado	40-72 mph	Some damage to chimneys; breaks branches off trees; pushes over shallow-rooted trees; damages sign boards.
F-1 Moderate Tornado	73-112 mph	The lower limit is the beginning of hurricane wind speed; peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos pushed off the roads; attached garages may be destroyed.
F-2 Significant Tornado	113-157 mph	Considerable damage. Roofs torn off frame houses; mobile homes demolished; boxcars pushed over; large trees snapped or uprooted; light object missiles generated.
F-3 Severe Tornado	158-206 mph	Roof and some walls torn off well constructed houses; trains overturned; most trees in forest uprooted
F-4 Devastating Tornado	207-260 mph	Well-constructed houses leveled; structures with weak foundations blown off some distance; cars thrown and large missiles generated.
F-5 Incredible Tornado	261-318 mph	Strong frame houses lifted off foundations and carried considerable distances to disintegrate; automobile sized missiles fly through the air in excess of 100 meters; trees debarked; steel re-inforced concrete structures badly damaged.
F-6 Inconceivable Tornado	319-379 mph	These winds are very unlikely. The small area of damage they might produce would probably not be recognizable along with the mess produced by F4 and F5 wind that would surround the F6 winds. Missiles, such as cars and refrigerators would do serious secondary damage that could not be directly identified as F6 damage. If this level is ever achieved, evidence for it might only be found in some manner of ground swirl pattern, for it may never be identifiable through engineering studies.