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Learn how clouds form from water vapor and the distinct features of cumulus, cirrus, and stratus clouds. Discover how each cloud type indicates different weather conditions.
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Clouds Weather Unit
How do clouds form? Water vapor in the air rises, cools, and condenses (or moves from a warm place to a cool place and condenses), forming the water droplets that make up a cloud. A cloud is a collection of tiny, liquid water droplets not water vapor gas.
Cumulus Clouds Puffy, lumpy-looking clouds often with flat bottom
Cumulus Clouds They form when large bubbles of warm air rise rapidly into the atmosphere.
Cumulus Clouds When the cumulus clouds are dark, they usually bring rain. White cumulus clouds do not bring rain.
Cirrus Clouds High, thin wispy clouds
Cirrus Clouds They are formed mostly of ice crystals.
Cirrus Clouds Cirrus clouds are most often associated with fair weather.
Stratus Clouds Clouds that spread out in layers covering a large area
Stratus Clouds They form as warm air is pushed over cold air. These clouds often bring rain.
Stratus Clouds Stratus clouds are often lower in the sky.