Where the EF scale differs, however, is in the number of criteria used to assess a tornado's level of damage. A tornado is rated from one of six categories (F0, F1, F2, F3, F4 or F5) on this scale. EF-0 Wind gusts are estimated between 105 and 137 kilometers per hour (65 and 85 miles per hour). The Fujita Scale is used to estimate the wind speed within a tornado. It was developed in 1971 by Tetsuya Fujita, with support from Allen Pearson.
These are tornadoes which are rated EF0 or EF1 (on the Enhanced Fujita Scale) since February 2007, and F0-F1 (on the Fujita Scale) prior to that*. About 90 percent of tornadoes in the record are weak. First, there are damage indicators -- objects that can be damaged in the tornado. Tornadoes are rated by their intensity and the damaged they cause to vegetation and human created structures. There were six levels on the original scale. F0
The meteorologist created the scale in 1971 based on the wind speed and type of damage caused by a tornado. The Fujita Scale is a well known scale that uses damage caused by a tornado and relates the damage to the fastest 1/4-mile wind at the height of a damaged structure. The EF Scale incorporates 28 damage indicators (DIs) such as building type, structures, and trees. It classifies tornadoes into six different categories (EF0 through EF5 instead of F0 through F5). Tornado intensity is classified on the Fujita Scale – named after Dr. Ted Fujita (aka Dr. Tornado) who in 1971 developed a rating methodology. Fujita's scale was designed to connect smoothly the Beaufort Scale (B) with the speed of sound atmospheric scale, or Mach speed (M). The original Fujita Scale and the new Enhanced Fujita Scale is used to rate the intensity of a tornado by examining the damage caused by the tornado after it has passed over a man-made structure. After a tornado has passed, experts assess the damage, estimate wind speeds, and categorize tornadoes according to the Enhanced Fujita Scale, with ratings from EF-0 to EF-5. The EF Scale takes into account more variables than the original F Scale did when assigning a wind speed rating to a tornado. Developed in 1971 by T. Theodore Fujita of the University of Chicago (No longer used in the U.S.) The new "EF" scale is similar to its predecessor.
The weakest tornado is an F0, while the strongest is an F5. Fujita Tornado Damage Scale. The Enhanced Fujita Scale or EF Scale, which became operational on February 1, … Fujita Scale (F-Scale) The Fujita Scale is a tornado rating scale. Dr. T. Theodore Fujita first published the Fujita scale in a research paper in 1971, entitled, "Proposed Characterization of Tornadoes and Hurricanes by Area and Intensity." AccuWeather explains the scale and where it originated. Tornadoes were originally rated on the Fujita Scale, named for its inventor, University of Chicago meteorologist T. Theodore Fujita. The Fujita scale (F-Scale), also known as the Fujita-Pearson scale, is a tornado scale that was introduced in 1971 by Tetsuya Fujita.