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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 ...
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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]
Long-track tornadoes of greater than EF2 intensity will be likely in some areas. Wind gusts greater than 70 mph will also be possible." (8 p.m. ET) Roof Ripped Off Texas Elementary School
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 ...
Over 30 tornadoes have been confirmed from December 26-29 across the South. That includes four strong tornadoes, of at least EF-2 strength. Two were rated EF-3 in southeastern Texas.
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 ...