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