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The TORRO tornado intensity scale (or T-Scale) is a scale measuring tornado intensity between T0 and T11. It was proposed by Terence Meaden of the Tornado and Storm Research Organisation (TORRO) , a meteorological organisation in the United Kingdom , as an extension of the Beaufort scale .
In the U.S., F0 and F1 (T0 through T3) tornadoes account for 80% of all tornadoes. 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.
The similar TORRO scale ranges from T0 for extremely weak tornadoes to T11 for the most powerful known tornadoes. [12] The International Fujita scale is also used to rate the intensity of tornadoes and other wind events based on the severity of the damage they cause. [13]
Most of Europe, on the other hand, uses the TORRO tornado intensity scale (or T-Scale), which ranks tornado intensity between T0 and T11; F4/EF4 tornadoes are approximately equivalent to T8 to T9 on the T-Scale. Tornadoes rated IF4 on the International Fujita scale are also included on this list.
The last official EF5 tornado to hit the U.S. was the infamous 2013 Moore, Oklahoma, tornado. This violent tornado was on the ground for more than 40 minutes, carving a path of devastation more ...
The Moore, Oklahoma tornado of May 20, 2013, is the most recent tornado to be rated EF5 as of 2025. The Xenia, Ohio, F5 tornado of April 3, 1974.This was one of two tornadoes to receive a preliminary rating of F6, which was downgraded later to a rating of F5.
National Weather Service teams are conducting surveys Wednesday after tornadoes hit Iowa. An initial survey showed at least EF3 damage in Greenfield.
With 55 tornadoes in 2024 as of Thursday, Iowa has seen the most tornadoes this year. A graphic from AccuWeather depicting the number of tornadoes each state has seen so far in 2024.