Fujita-Pearson Tornado Intensity Scale

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The Fujita-Pearson scale for rating tornado intensity is based on the damage tornadoes inflict on human-built structures and vegetation.

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Fujita-Pearson Tornado Intensity Scale
Fujita-Pearson Scale	Tornado Strength	Tornado Name	Maximum Wind Speed (miles per hour)	Path Length (miles)	Average Path Length (yard)	Damage
F0	Weak	Gale	< 73	< 1	< 18	Light	some damage to chimneys break branches off trees push over shallow-rooted trees damage sign boards
F1	Weak	Moderate	73 - 112	1 - 3.1	18 - 55	Moderate	lower limit is the beginning of hurricane wind speed peel surface off roofs mobile homes pushed off foundations or overturned moving autos pushed off the roads
F2	Strong	Significant	113 - 157	3.2 - 9.9	56 - 175	Considerable	roofs torn off frame houses mobile homes demolished and pushed over large trees snapped or uprooted light-object missiles generated
F3	Strong	Severe	158 - 206	10 - 31	176 - 556	Severe	roofs and some walls torn off well constructed houses trains overturned most trees in forest uprooted heavy cars lifted off the ground and thrown
F4	Violent	Devastating	207 - 260	32 - 99	557 - 1759	Devastating	well-constructed houses leveled structures with weak foundations blown off some distance cars thrown and large missiles generated
F5	Violent	Incredible	261 - 318	100 - 315	1760 - 5456	Incredible	strong frame houses lifted off foundations and carried considerable distance to disintegrate automobile sized missiles fly through the air in excess of 100 meters(109 yards) trees debarked incredible phenomena will occur
> F6	not expected to occur on the surface of Earth