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The Online Tornado FAQ (by Roger Edwards, SPC)

Apr 19, 2018 · THE BASICS ABOUT TORNADOES. What is a tornado? According to the Glossary of Meteorology (AMS 2000), a tornado is "a violently rotating column of air, pendant from a cumuliform cloud or underneath a cumuliform cloud, and often (but not always) visible as a funnel cloud."

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