Tornado is a fast rotating column of air that forms the relationship between a cumulonimbus cloud or in the rare event of a cumulus cloud base to the ground. Tornadoes come in many sizes but are typically funnel-shaped visible condensation, whose narrow end touches the earth and is often surrounded by a cloud of debris. Most tornadoes have wind speeds of 177 km / h or more with the average reach of 75 m and take a few kilometers before dissipating. Several tornadoes that reached wind speeds of 300-480 km / h stretch more than a mile (1.6 km) and can survive on surfaces with more than 100 km.
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