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Related to altostratus: nimbostratus, altocumulus


see cloudcloud,
aggregation of minute particles of water or ice suspended in the air. Formation of Clouds

Clouds are formed when air containing water vapor is cooled below a critical temperature called the dew point and the resulting moisture condenses into droplets on
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altostratus (As)

A grayish or bluish cloud sheet or layer of striated, fibrous, or uniform appearance; totally or partially covering the sky; and having parts thin enough to reveal the sun at least vaguely. Altostratus does not show halo phenomena. On weather charts, altostratus clouds are represented by the symbol. image
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
In between the spiral bands is an area of overcast cirrus and altostratus, with showery precipitation alternating with cloudy skies, and ceilings averaging 1000 to 3000 feet.
Middle clouds including the altocumulus, altostratus, and nimbostratus are considered as being the ice phase, and low clouds including the cumulus, stratocumulus, and stratus are in the liquid phase.
Areas of altostratus and cirrus surround the convective rainbands with a thick cirrus canopy in the upper troposphere, engulfing a majority of the storm system.
Altostratus, or middle clouds, are water droplet clouds from two to four miles above Earth.