cap cloud

cap cloud

[′kap ‚klau̇d]
(meteorology)
An approximately stationary cloud, or standing cloud, on or hovering above an isolated mountain peak; formed by the cooling and condensation of humid air forced up over the peak. Also known as cloud cap.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

cap cloud

A standing, or stationary, caplike cloud crowning a mountain top.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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If a cloud curls over the top of the ridge and part way down the lee slope, it's called a cap cloud. It means that the air is stable and conditions are ripe for wave activity.