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Tornado (or tornádo from Spanish tornado "spinning") is an atmospheric vortices in a cumulonimbus (thunderstorm) cloud, rain and spreads down, often up to the surface of the Earth, in the form of a cloud or sleeves of the trunk diameter in the tens or hundreds of metres. Development of the tornado from the cloud makes it different from some of the outwardly similar and also different by nature phenomena, such as tornado-vortexes and dust (sand) eddies. Usually, transverse diameter of the funnel of a tornado in the lower section is 300-400 m, although if a tornado touches the surface of the water, this value may be as low as 20-30 m, and with the passage of the funnel over land can reach 1.5-3 km.
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