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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 consists of Altostratus and Altocumulus clouds. The prefix alto- means 'middle.' Middle clouds consist 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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Altostratus clouds (weather symbol - As) consist of water and some ice crystals. They belong to the Middle Cloud group (2000-7000m up). An altostratus cloud usually covers the whole sky and has a gray...more

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Altocumulus clouds (weather symbol - Ac), are made primarily of liquid water and have a thickness of 1 km. They are part of the Middle Cloud group (2000-7000m up). They are grayish-white with one part...more

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