Fujita scale is a way of measuring how strong a tornado is. It rates tornadoes from 0 to 5, with 0 being the weakest and 5 being the strongest. 0 tornadoes are less than 73 mph, 1 tornadoes are 73-112 mph, 2 tornadoes are 113-157 mph, 3 tornadoes are 158-206 mph, 4 tornadoes are 207-260 mph, and 5 tornadoes are 261 mph and stronger. The Fujita scale helps scientists and meteorologists understand how violent a tornado is and what kind of damage it can cause.