funnel cloud

/F AH1 N AH0 L K L AW0 D/
noun
  1. 1

    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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Source: https://en.wiktionary.org/wiki/funnel%20cloud