Funnel-cloud definitions

A funnel-shaped cloud descending from a larger cloud, especially from a wall cloud, caused by the sudden condensation of water in the extreme low pressure of rapidly rotating air, as typically occurs in a tornado.
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A slender, rotating, funnel-shaped cloud extending downward from a cumulus or cumulonimbus cloud: such a cloud becomes a tornado if it contacts the ground while rotating at very high speed.
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(meteorology) A tapering cloud descending from a larger storm cloud, indicating the presence of an intense vortex. A tornado is a funnel cloud which reaches the ground.

When we saw the funnel cloud, we headed for the basement.

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