The scale is subjective is not a problem with the Fujita Scale, which uses damage to rank the severity of a tornado and estimate its wind speeds.
ABOUT FUJITA SCALEThe Fujita scale is a scale for rating tornado intensity, primarily based on the damage tornadoes cause to man-made structures and vegetation. Fujita's official scale categories are determined by meteorologists and engineers after ground or air damage surveys, or both; and depending on the circumstances, ground rotation patterns (cycloidal markings), weather radar data, witness testimony, media reports and damage imagery, as well as photogrammetry or videogrammetry if motion picture recording is available. The Fujita scale was replaced with the Enhanced Fujita scale (EF-Scale) in the United States in February 2007.
In April 2013, Canada adopted the EF Scale over the Fujita scale along with the 31 "Specific Damage Indicators" used by Environment Canada (EC) in their ratings.
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