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The EF scale is also unofficially used in other countries, including China and Brazil. [2] [3] The rating of a tornado is determined by conducting a tornado damage survey. The scale has the same basic design as the original Fujita scale—six intensity categories from zero to five, representing increasing degrees of damage.
Under this version, each tornado would be assigned one Fujita scale rating and two Pearson scale ratings. For example, a tornado rated F4 based on damage with a path length of 63 miles (101 km) and a path width of 800 yards (730 m) would be rated F,P,P 4,4,4.
Initially receiving an official EF3 rating based on damage, the El Reno tornado was subsequently upgraded to a radar-estimated EF5 rating, the highest on the scale, based on data from a mobile radar. The University of Oklahoma 's RaXPol mobile Doppler weather radar, positioned at a nearby overpass, measured winds preliminarily analyzed as in ...
It's likely this tornado's winds were on the weaker end of the spectrum along the lines of an EF0 (65 to 85 mph winds), but since there was no visual damage to inspect, that rating can't be used ...
As a result, tornadoes that might have been classified as F5 under the old system could now be assigned an EF4 rating under the EF scale due to stricter criteria. ( MORE: The Nation's Most Violent ...
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.
Following the implementation of the Fujita Scale in 1971, [5] hundreds of post-event damage surveys have been conducted on tornadoes and other weather events to determine the rating of the tornado. [6] In the 2020s, drones have been used to survey hard-to-access areas, most notably following the 2021 Western Kentucky tornado. [7]
The scale is intended to be analogous to the Fujita and Enhanced Fujita scales, while being more applicable internationally by accounting for factors such as differences in building codes. In 2018, the first draft version of the IF-scale, version 0.10 was published. This version was based on a 12-step rating scale.