| Rating | 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, 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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