|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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