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The Fujita scale (F-Scale; / f u ˈ dʒ iː t ə /), or Fujita–Pearson scale (FPP scale), is a scale for rating tornado intensity, based primarily on the damage tornadoes inflict on human-built structures and vegetation.
The Fujita scale (F-Scale), also known as the Fujita-Pearson scale, is a tornado scale that was introduced in 1971 by Tetsuya Fujita. In the United States the Fujita scale was replaced with the Enhanced Fujita scale (EF-Scale), which is now the primary scale used the United Sites and Canada.
The version used today—the Enhanced Fujita Scale—ranges from EF0 tornadoes with winds of 65 to 85 miles an hour, to EF5 tornadoes with winds exceeding 200 miles an hour. The U.S. National Weather Service has rated tornadoes according to the Fujita Scale since 1973.
The Enhanced Fujita scale (abbreviated as EF-Scale) rates tornado intensity based on the severity of the damage they cause. It is used in some countries, including the United States and France. [1] The EF scale is also unofficially used in other countries, including China. [2]
ScaleWind Speed Estimate[17](mph)Wind Speed Estimate[17](km/h)Frequency[18]EFUN/AN/A3.11%EF065–85105–13752.82%EF186–110138–17732.98%EF2111–135178–2178.41%May 4, 2024 · Since 2007, the EF Scale has been used to rate tornadoes. The Enhanced Fujita Scale provides an estimated range of a tornado's wind speeds, based on the tornado's damage. - Articles from...
Without a thorough engineering analysis of tornado damage in any event, the actual wind speeds needed to cause that damage are unknown. The Enhanced F-scale was implemented in February 2007.
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. Fujita's scale was designed to connect smoothly the Beaufort Scale (B) with the speed of sound atmospheric scale, or Mach speed (M).
