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lee wave

noun

mountain wave

noun
1.
the wavelike effect, characterized by severe updrafts and downdrafts, that occurs when rapidly flowing air encounters the steep front of a mountain range.
Also called lee wave.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lee-wave

lee wave

noun
1.
(meteorol) a stationary wave sometimes formed in an air stream on the leeward side of a hill or mountain range
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for lee-wave

lee wave

vertical undulation of airstreams on the lee side of a mountain. (The lee side is the side that is downstream from the wind.) The first wave occurs above the mountain that causes it, with a series of waves of equal horizontal wavelength extending downstream. Numerous equally spaced lee waves are often seen where they are not interfered with by other mountains, such as over the sea. They may produce clouds, called wave clouds, when the air becomes saturated with water vapour at the top of the wave

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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