Fujita scale

The Fujita scale , also known as the Fujita-Pearson Scale or F-scale , was introduced by Professor Theodore Fujita in 1971 to classify tornadoes / tornadoes . The scale consists of 6 categories: from F0 to F5. Moreover, the interval between F0 and F1 corresponds to the 11th and 12th points on the Beaufort scale . The tornado categories F6-F12 were introduced as theoretical, and regardless of the wind speed in the tornado, even if it exceeds 512 km / h, the maximum assigned category in any case will be F5 ^[1] . The most common are tornadoes of categories F1 and F2. Less commonly, higher categories. The theoretical speed of the tornado of the F6 scale is equal to the speed of sound.

The maximum wind speed of the most powerful tornadoes is difficult to measure: after all, not a single meteorological device will survive.

Fujita scale

Category	Wind speed		Frequency	Characteristic
	m / s	km / h
F0	18–32.5	64-116	38.9%	Stormy. It damages chimneys and television towers, breaks old trees (also felling trees with shallow roots), demolishes signboards.
F1	32.6-50	117-180	35.6%	Moderate. Tears off the roof of houses, severely damages mobile homes, turns over trailers, moves cars, uproots some trees and carries them away.
F2	51–70	181-253	19.4%	Significant. Tears down roofs from houses and knocks out windows, destroys mobile homes and wooden buildings, uproots large trees and blows them, knocks over freight cars.
F3	71-92.5	254-332	4.9%	Strong. Tears off roofs from houses and breaks down part of vertical walls, knocks down trains and cars, uproots most of the trees, lifts heavy cars into the air, tears structures with a steel shell (such as hangars ).
F4	92.6-116.5	333-418	1.1%	Destructive. It lifts light houses into the air, completely knocks down the frames of durable houses, carries cars over a considerable distance and throws trains, damages tall buildings.
F5	116.6 and more	419 and more	less than 0.1%	Devastating. Tearing down solid houses from the foundation and transferring them to considerable distances, tearing off asphalt, carrying heavy vehicles over a distance of more than 100 meters, causing serious damage to skyscrapers and reinforced concrete buildings.