We haven’t figured out exactly what gives them their shape, determines altitude – or makes them rain when they do. But ...

Clouds are categorized into three main groups based on their altitude: cirrus, cumulus, and stratus. Cirrus clouds are high-altitude clouds, often appearing as thin, wispy strands. They are ...

“Cirrus clouds are not so well understood,” says ... where they can be carried around the entire planet. The high altitude of these formations makes them difficult to study—too high for ...

How Are Clouds’ Shapes Made? Explore the diverse world of cloud formations, from ground-level fog to high-flying cirrus clouds, and learn how these atmospheric features can help predict weather ...

When cumulonimbus clouds grow high enough into the atmosphere, the temperature becomes cold enough for ice clouds, or cirrus, to form. Clouds made up entirely of ice are usually more transparent.

When cumulonimbus clouds grow high enough into the atmosphere, the temperature becomes cold enough for ice clouds, or cirrus, to form. Clouds made up entirely of ice are usually more transparent.