M7 Clouds: Altocumulus (Ac) in Layers or with As or Ns

M7

Altocumulus in two or more layers, usually opaque in places, and not progressively invading the sky;

or

opaque layer of altocumulus, not progressively invading the sky;

or

altocumulus together with altostratus or nimbostratus.

Additional Views:

Notes: When altocumulus occurs together with altostratus or nimbostratus, it is generally considered and M7 cloud. The clouds may occur as a single or a multiple layer, showing partly the characteristics of altocumulus and partly those of altostratus or nimbostratus. It is also considered an M7 cloud if altocumulus is in two or more layers, or thick altocumulus in a single layer. None of these clouds are progressively invading the sky.

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