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A funnel cloud forms when the vortex of a developing tornado draws in moist air. As the air enters the vortex it undergoes a pressure drop, which in turn produce a temperature drop. This causes the moisture to condense and form a funnel cloud.

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A funnel cloud forms when a rotating column of air extends downward from a cumulonimbus cloud but does not reach the ground. The spinning motion creates a funnel shape and if the funnel cloud reaches the ground, it becomes a tornado.

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9mo ago
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Q: What makes a funnel cloud?
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