Fujita Tornado Damage Scale
The Fujita scale was named after Professor Fujita and the director of the National Severe Storm Forecast Center, Allen Pearson. The Pearson Scale is not the same as the more common Fujita Scale in that it only measures the length and width of the path of the tornado. The Fujita Scale is what looks at the amount of destruction to the environment and to man made structures that are destroyed by the tornado. The Pearson Scale is a more scientific way of looking at a tornado while the Fujita Scale is more subjective since it relies on the aftermath and destruction of the tornado to estimate the wind speeds of the tornado.
This is a graph, which displays the Fujita scale shows the F-Scale along the left side of the graph as well as the level of destruction at right and the winds speeds that are capable of causing this destruction at the bottom.
The light damage indicated as an F0 on the scale would be considered broken branches on trees and some damage to road signs. At the other end of this scale you have the F5 tornado, which will damage or destroy even strongly built houses, lift cars off the ground and even uproot large trees and send them through the air. Fortunately the percentage of sever tornadoes that strike is less than 1% while the percentage of weak tornadoes we experience is 76%.