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F5. 261–318 mph. Incredible. The Fujita scale (F-Scale; / fuˈdʒiːtə /), 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 official Fujita scale category is determined by meteorologists and engineers after a ground or ...
The old scale lists an F5 tornado as wind speeds of 261–318 mph (420–512 km/h), while the new scale lists an EF5 as a tornado with winds above 200 mph (322 km/h), found to be sufficient to cause the damage previously ascribed to the F5 range of wind speeds.
Pieter Groenemeijer, the director of the European Severe Storms Laboratory noted that "on the IF-scale, 250 mph measured below 60 m above ground level is IF4 on the IF-scale, 290 mph is IF5." [80] After further analysis, this report was revised to winds of 308–319 mph (496–513 km/h) at 36–38 yards (33–35 m) above the surface. [81]
Tornado intensity is the measure of wind speeds and potential risk produced by a tornado. Intensity can be measured by in situ or remote sensing measurements, but since these are impractical for wide-scale use, intensity is usually inferred by proxies, such as damage. The Fujita scale, Enhanced Fujita scale, and the International Fujita scale ...
F1 tornadoes on the Fujita scale and T2 TORRO scale also begin roughly at the end of level 12 of the Beaufort scale, but are independent scales, although the TORRO scale wind values are based on the 3/2 power law relating wind velocity to Beaufort force. [7] Wave heights in the scale are for conditions in the open ocean, not along the shore.
Heading northeast at 40 mph (64 km/h), the tornado produced a continuous path 26 mi (42 km) long and 1 ⁄ 2 mi (0.80 km) in width before lifting and possibly reforming as a new tornado. It then redeveloped for 20 mi (32 km) between Canyon and Happy , causing a much narrower, 50-to-75-yard-wide (46 to 69 m) swath of damage.
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