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The International Fujita scale (abbreviated as IF-Scale) is a scale that rates the intensity of tornadoes and other wind events based on the severity of the damage they cause. [1] It is used by the European Severe Storms Laboratory (ESSL) and various other organizations including Deutscher Wetterdienst (DWD) and State Meteorological Agency ...
[43] [44] The same supercell responsible for the Kellerville tornado cycled and formed a violent tornado to the west of Allison, Texas. The tornado initially moved to the northeast at around 60 miles per hour with a maximum width of 1.25 miles before slowing significantly, turning to the west, and occluding similar to the tornado before it.
The 1977 Birmingham–Smithfield F5 tornado's damage was surveyed by Ted Fujita and he "toyed with the idea of rating the Smithfield tornado an F6". [13] In 2001, tornado expert Thomas P. Grazulis stated in his book F5–F6 Tornadoes; "In my opinion, if there ever was an F6 tornado caught on video, it was the Pampa, Texas tornado of 1995". [14]
These scales – the Fujita scale, the Enhanced Fujita scale, the International Fujita scale, and the TORRO tornado intensity scale – attempt to estimate the intensity of a tornado by classifying the damage caused to natural features and man-made structures in the tornado's path. Tornadoes are among the most violent known meteorological ...
The rate of occurrence drops off quickly with increasing strength—violent tornadoes (F4/T8 or stronger), account for less than one percent of all tornado reports. [6] Worldwide, strong tornadoes account for an even smaller percentage of total tornadoes. Violent tornadoes are extremely rare outside of the United States and Canada.
Other organizations like the European Severe Storms Laboratory (ESSL) and Environment and Climate Change Canada (ECCC) on the other hand, did rate tornadoes prior to 1950. The only violent tornado that impacted the United States prior to 1950 and has an official rating is the 1946 Windsor–Tecumseh tornado, which received a rating from ECCC ...
On March 24, two dozen twisters touched down across the Southeast, including the deadliest and one of the year's most violent tornadoes. The EF4 tornado ripped through Rolling Fork, Mississippi ...
Police officers surveying tornado damage in Moore, Oklahoma following the 2013 Moore tornado. A tornado damage survey, also known as a storm damage assessment, is a type of land survey that is conducted to determine the damage caused by tornadoes, and to give them ratings on the Enhanced Fujita scale.