Classification of Tornadoes on the Fujita Scale
F0 - Light damage. Winds up to 72 mph.
F1 - Moderate damage. Winds 73 - 112 mph.
F2 - Considerable damage. Winds 113 - 157 mph.
F3 - Severe damage. Winds 158 - 206 mph.
F4 - Devastating damage. Winds 207 - 260 mph.
F5 - Incredible damage. Winds above 261 mph.