- Cloud type, Acl: deep lenticular cloud (disk-shaped wave clouds)
- W993922Z
- Cloud type, Acl: deep lenticular cloud elements (Altocumulus) over mountains in Montana, with some thin Cirrus clouds above. Each of these disk-shaped wave clouds hover over a separate mountain peak. They change in size with time as the degree of moistness at that level varies, thus acting as visible indicators of midlevel moisture in the atmosphere.
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