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Fujita Scale
(or F Scale) - A scale of tornado intensity in which wind speeds are inferred from an analysis of wind damage:

RatingWind, Damage
F0 (weak)40-72 mph, light damage
F1 (weak)73-112 mph, moderate damage
F2 (strong)113-157 mph, considerable damage
F3 (strong)158-206 mph, severe damage
F4 (violent)207-260 mph, devestating damage
F5 (violent)260-318 mph (rare), incredible damage


All tornadoes, and most other severe local windstorms, are assigned a single number from this scale according to the most intense damage caused by the storm.

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