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From fluffy cumulus to feathery cirrus to imposing cumulonimbus.

Cumulus clouds form when the warmth from the ground rises (and there is enough moisture in the environment to create clouds). As the warm air rises, it gradually cools.

Cumulus: Detached, bright white, dense clouds and with sharp outlines that develop vertically in the form of rising mounds, domes or towers. The bulging upper parts often resemble a cauliflower.

How are clouds’ shapes made? A scientist explains the different cloud types and how they help forecast the weather. Just4Kids.

Have you ever wondered how clouds stay in the sky? Here's your answer, and by the way, the weight of an actual cloud might surprise you.

Clouds form because of moisture in the air. Once you understand how they develop their shapes, you can learn to forecast the weather.

Puffy to wispy, barely there or dark and menacing, clouds come in many shapes and sizes. Each tells a story about what’s going on in the atmosphere.

Shown is a schematic of how cloud streets form. Warm, rising air creates long lines of cumulus clouds, while cool, sinking air creates cloud-free zones in between cloud formations.

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.