- The Fujita scale (F-Scale), or Fujita–Pearson scale, is a scale for rating tornado intensity, based primarily on the damage tornadoes inflict on human-built structures and vegetation.
- The original Fujita scale was developed by a prominent Japanese-American Dr. T. Theodore Fujita (1920-1998) and was put into use in 1971.
- His research at the University of Chicago on severe thunderstorms, tornadoes, hurricanes and typhoons revolutionized knowledge of each.
- The scale was enhanced in 2007, with rankings running from Enhanced Fujita – 0 through 5. The ratings are based on the amount and type of wind damage.