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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 and Brazil.
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 ]
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.
Lastly, an EF5 tornado, the highest rating a tornado can receive, can create an incredible amount of damage. Wind speeds in an EF5 are in excess of 201 mph. Trees can be debarked with only stubs ...
The Enhanced Fujita scale measures a tornado's intensity on a scale of 1 to 5 based on its wind speed estimates and resulting damages.
Tornadoes are rated after they have passed and have been examined, not whilst in progress. In rating the intensity of a tornado, both direct measurements and inferences from empirical observations of the effects of a tornado are used. Few anemometers are struck by a tornado, and even fewer survive, so there are very few in-situ measurements.
Tornadoes are measured on the Enhanced Fujita Tornado Intensity Scale, known as EF. The scale, which starts with a severity of EF-0 (for winds of about 65-85 miles per hour) and ends with EF-5 ...
This version was based on a 12-step rating scale. Over the next few years, dozens of tornadoes would be rated on this version of the scale. Most notably, the 2021 South Moravia tornado received a rating (IF4) and full damage survey on the IF-scale conducted by ESSL, the Czech Hydrometeorological Institute and four other organizations. [2]