mountain wave

noun
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. 2013.
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Mountain wave is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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Example sentences
The area has abundant ridge, thermal and mountain wave conditions.
Mountain wave activity affecting the area during the day but no damage sustained.
We will discuss mountain flying techniques including how to use mountain wave, ridge lift and where the sink and danger areas are.
Sometimes regions of mountain wave turbulence are indicated by the presence of clouds, sometimes not.
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