In 1971, Dr. Theodore Fujita developed a method for categorizing tornadoes by looking at how much damage they cause and using this to estimate the wind speed. This system is called the F-Scale or Fujita Scale; it classifies tornadoes by their estimated wind speed, which is determined by looking at how strong the wind must have been to cause the resulting damage.
In 1969 the Saffir-Simpson Hurricane Scale was developed. Hurricanes are classified into five categories based on current maximum wind speed.
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