A funnel cloud is also called a tuba.
Funnel clouds are fascinating weather phenomena. The reference provides key information about them:
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Funnel clouds, or tuba, are spinning cloud formations that extend downwards but do not reach the ground.
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If a funnel cloud does touch the ground, it is then classified as a tornado.
In essence, the term "tuba" is used interchangeably with "funnel cloud" to describe this particular weather formation before it makes contact with the Earth's surface and becomes a tornado.
