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I know this question has an answer confirmed, but I'll add my own comments for posterity's sake. There are different types of clouds. Buoyancy-driven (cumulus-type) clouds are the types that have the most definitive bases and ceilings. The cloud base is approximately the Lifted Condensation Level, which is the height that the air near the surface would have ...


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In a sense, the full structure of a cumulus cloud extends all the way to the ground. The cloud is formed from the convection of air rising off the ground. The rising column becomes visible as a cloud when the atmospheric temperature becomes cold enough to condense water vapor, and the level where that occurs is the base we see. From Wikipedia: Cumulus ...


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