What do a.m. and p.m. stand for?

mountain wave

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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for mountain wave
  • 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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