Published on Feb 8, 2020

Cloudy Sky Background Images

License Info: Creative Commons 4.0 BY-NC

Have you ever watched clouds on a summer day? Some clouds are white, fat and fluffy. They float high in the sky. Others are low, gray and thin. They might even look a little green. Scientists have discovered several kinds of clouds and named them. Watching the clouds is not only fun, but it can give you clues about what kinds of weather are coming.

Fun Facts about Clouds

Tiny droplets of water in the air rise with warm air. As they rise, they get cooler. They combine with other droplets of water to form clouds.

Clouds are white because they reflect light from the sun. Gray clouds become so filled with water that they don’t reflect light. Masses of clouds form shadows, which can also cause the clouds to look gray.


Cumulus clouds look like fluffy tufts of cotton floating in the sky. Sometimes they might take the shape of a dragon, a turtle or some other creature. You’ll see cumulus clouds on warm, sunny days.

Cumulonimbus clouds are large, flat clouds that spread across the sky. One end of the cloud might be shaped like an anvil. Cumulonimbus clouds mean a storm or thunderstorm is coming. Sometimes they bring hail, snow or tornadoes.

Contrails are the white streaks left behind by airplanes. Heat from the exhaust pipes mixes with cold water droplets to make icy, white crystals.

Green clouds often mean a tornado is coming.

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