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Middle Clouds - Windows to the Universe

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Altostratus clouds are part of the middle cloud group.
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Courtesy of Keith G. Diem. Used by permission.

Middle Clouds

The middle cloud group is made up of Altostratus and Altocumulus clouds. Middle clouds are made of ice crystals and water droplets. The base of a middle cloud above the surface can be anywhere from 2000-8000m in the tropics to 2000-4000m in the polar regions.

Last modified September 25, 2007 by Becca Hatheway.

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