Foehn cloud

foehn cloud

Any cloudform associated with the foehn, usually referring to standing clouds of two types, orographic clouds and mountain wave clouds.

Orographic clouds may include crest clouds and the foehn wall. Wave clouds may consist of lenticular (including altocumulus standing lenticular, or ACSL) clouds, lee-wave clouds and cloud bands, and rotors.
See also Bishop wave, chinook arch, contessa di vento, Moazagotl.

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(Abbreviated Ac.) A principal cloud type (cloud genus), white and/or gray in color, that occurs as a layer or patch with a waved aspect, the elements of which appear as laminae, rounded masses, rolls, etc.