Level Zero on the Fujita Scale or F0
An F0 on the Fujita Scale is the least severe of tornadoes. F0s have wind speeds of up to 72 miles per hour. The damage of these tornadoes is typically superficial. Chimneys and signs may sustain damage. Tree branches can break and small trees or trees with shallow roots may fall over.
F1
F1 tornadoes have wind speeds between 73 and 112 miles per hour. They are capable of damaging roofs and moving mobile homes off of their foundations. One of the most dangerous things that F1s are capable of is blowing around moving vehicles. They can push moving vehicles off roads or into other vehicles.
F2
F2 tornadoes can rip the roofs off of homes, destroy mobile homes and move train cars off the tracks. Larger trees can snap in half in an F2. These tornadoes can whip small objects through the air and lift cars off the ground. The wind speed of an F2 is anywhere between 113 to 157 miles per hour. That is the same as anywhere between a Category 3 and a Category 5 hurricane.
F3
F3 tornadoes can cause severe damage and loss of life. They are capable of pushing over entire trains with winds between 158 and 206 miles per hour. F3 tornadoes do not only lift up cars, but they can throw them. These tornadoes will rip up most trees in their path. F3 tornadoes and above have sustained winds of which only Category 5 hurricanes -- the highest on the hurricane scale -- are capable.
F4
F4 tornadoes produce winds between 207 and 260 miles per hour. This is enough wind to destroy strong homes and throw weaker homes. Cars can blow through the air, damaging property and injuring or killing people. Level four tornadoes are capable of throwing most objects.
F5
F5s are the most devastating of tornadoes. They have winds between 261 and 318 miles per hour. These tornadoes are capable of creating awful damage. They can rip the bark right off of trees, toss and destroy any home above ground and damage steel-reinforced concrete buildings.