foehn wall

foehn wall

[′fān ‚wȯl]
(meteorology)
The steep leeward boundary of flat, cumuliform clouds formed on the peaks and upper windward sides of mountains during foehn conditions.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Downwind of the mountain barrier, relative humidity decreases rapidly, indicating the foehn wall and subsequent clear sky.