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Why do some clouds have flat bottoms?

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Dear Tom,Why are many clouds flat at the bottom?—Hans WeckerleDear Hans,You have described cumulus clouds, which are most prevalent during the warmer months but occasionally populate the. read more

Clouds are flat on the bottom because this is the transition point where the temperature & pressure are at a point where the air cannot hold all of it's water in its gaseous form (clouds are made of water in its liquid or solid state). As you increase in altitude, temperature and atmospheric pressure decrease. read more

The flat bottoms of cumulus clouds define the exact height at which a critical combination of temperature and air pressure causes water vapor within the rising current to condense into a visible cloud. read more

Not all clouds have flat bottoms, of course. This is only true for clouds formed by rising warm air while they are still forming. Little fluffy circular clouds, as one example, are usually created by small thermal ‘bubbles’ but as the clouds drift downwind they move away from the thermal that created them and become rounder. read more

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Why do clouds have flat bottoms?
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