Tornadoes
tornado: a violently rotating column of air associated with a thunderstorm that is in contact with the ground. Tornadoes are categorized as weak, strong or violent with winds of up to, or more than 300 mph
F-Scale: a method of measuring tornado intensity created by tornado research pioneer Dr. Theodore Fujita. In summary: F0-F1, weak tornado; F2-F3, strong tornado; F4-F5, violent tornado.
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