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A tornado can be reported more than once, such as when a storm crosses a county line and reports are made from two counties. The severity of tornadoes is measured by the Enhanced Fujita Scale, which measures tornado intensity on a scale of EF0 to EF5 based on wind speed and intensity of destruction. The ratings are made after the tornado has ...
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.
In late 2023, American meteorologist and tornado expert Thomas P. Grazulis created the Outbreak Intensity Score (OIS) as a way to rank tornado outbreaks. [1] [2] For the score, only significant tornadoes are counted: F2/EF2 tornadoes receive 2 points each, F3/EF3 tornadoes receive 5 points each, F4/EF4 tornadoes receive 10 points each, and F5/EF5 tornadoes receive 15 points each. [1]
That figure is inflated somewhat by 2011, when one of the costliest and deadliest tornado outbreaks ever recorded claimed the lives of at least 553 people, including more than 150 in one Missouri ...
Severe tornado damage occurs with an EF3 tornado, which has wind speeds of 136 to 165 mph. Some walls of well-constructed houses can be torn off. Most trees in the path of the twister will be ...
SPC is interested in tornado, convective wind, and hail data. The tornado portion of the database, the National Tornado Database, is one of three authoritative tornado databases. Another is the DAPPL (short for Damage Area Per Path Length) database that was headed by Ted Fujita at the University of Chicago and concerns the period from 1916 to 1992.
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.
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. Violent tornadoes, those rated F4/EF4 and F5/EF5 ...