Mountain-wave cloud

From Glossary of Meteorology
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mountain-wave cloud

A cloud that forms in the rising branches of mountain waves and occupies the crests of the waves.

The most distinctive are the sharp-edged, lens-, or almond-shaped lenticular clouds, but a variety of stratocumulus, altocumulus, and cirrocumulus forms appear in both the main, vertically propagating waves and in the lee waves.
See mountain wave, foehn cloud.