The Fujita scale , or F-scale, is a measurement scale to determine how severe they are. The bigger the number the more damage and devastation they will cause. The number is officially determined by the meteorologist or someone else that has a college degree in weather. They determine this number after they see what damage a tornado has done to buildings trees and what not.
But they don't just see how many trees it toppled over, or how many buildings collapsed, they observe what types of buildings were damaged. Because an F-6 tornado may have overturned a solid steel plated building, versus an F-O tornado that overturned a shack. If the tornado made damages to buildings made of stronger materials and uprooted trees then it would be generally a stronger tornado. But if a tornado had almost no effect on an environment then it would be an F-O.
The Fujita scale was introduced in 1971 by Ted Fujita (University Chicago) who made the scale with Allan Peterson head of the N.S.S.F.C. It stands for the National Severe Storms Forecast Center. The Fuita scale only goes up to the number 6, and the minimum number is O. Many tornadoes are measured at level zero and commonly don't even touch down. But thankfully the meteorologists have never measured an F-6. These are the basics of the Fujita Scale. (http://en.wikipedia.org/wiki/Fujita_scale)
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About sevent five percent of tornadoes are F0-F1. And did you know that the Fujita scale only used to go up to an F-5. They also have a new enhanced version of the scale. It goes up from EF0-EF6. It is basically the same thing but it goes into a little more detail on the damage made by the tornadoe. All it does is take into consideration the strength and material that the building was made out of.
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