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. 2014.
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We will discuss mountain flying techniques including how to use mountain wave, ridge lift and where the sink and danger areas are.
The area has abundant ridge, thermal and mountain wave conditions.
Sometimes regions of mountain wave turbulence are indicated by the presence of clouds, sometimes not.
Mountain wave activity affecting the area during the day but no damage sustained.
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