washingtonpost.com: Weather

Funnel cloud A condensation funnel extending downward from the base of a towering cumulus or Cb, associated with a rotating column of air that is not in contact with the ground (and hence different from a tornado). A condensation funnel is a tornado, not a funnel cloud , if either a) it is in contact

Weather Glossary

Funnel cloud

A condensation funnel extending downward from the base of a towering cumulus or Cb, associated with a rotating column of air that is not in contact with the ground (and hence different from a tornado). A condensation funnel is a tornado, not a funnel cloud , if either a) it is in contact with the ground or b) a debris cloud or dust whirl is visible beneath it.

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