To understand how clouds get their shape, it helps to understand the basics of how they form. When air rises and cools, the ...

A close-up image of a cumulus congestus cloud above the Arabian Peninsula. These clouds form when warm, moist air rapidly ascends in unstable atmospheric conditions. A close-up image of a cumulus ...

A cumulus cloud that shows "significant vertical development ... the wispy cloud with peachy amber hues," he said. A stock image shows large cumulonimbus clouds lit by a setting sun.

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Towering, dense clouds with a flat, anvil-shaped top. Develops from cumulus clouds and can reach great heights, often associated with thunderstorms. Indicates severe weather, such as thunderstorms ...

Cumulus clouds form in the sky over Santa Fe, New Mexico. (Photo by Robert Alexander/Getty Images) Clouds are saturated parcels of air. Water molecules also have weight. One molecule of water is ...

The cumulus congestus cloud rises dramatically in the image, casting a dark shadow over the landscape below. Cumulus clouds appear in a wide variety of shapes and sizes, often recognized as the ...