middle clouds

middle clouds

[′mid·əl ′klau̇dz]
(meteorology)
Types of clouds the mean level of which is between 6500 and 20,000 feet (1980 and 6100 meters); the principal clouds in this group are altocumulus and altostratus.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

medium clouds

Clouds at medium heights—that is, which occur between 6000 (approximately 1.8 km) and 20,000 ft (6 km). The names are prefixed by the word alto, such as in altocumulus and altocirrus clouds. Also called middle clouds.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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References in periodicals archive ?
"Middle clouds" (6,500 to 23,000 feet) include altocumulus, altostratus, and nimbostratus.
Altostratus, or middle clouds, are water droplet clouds from two to four miles above Earth.