Fujita scale

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A scale of wind damage intensity in which wind speeds are inferred from an analysis of wind 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, devastating damage; F5 (violent), 261-318 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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