Altocumulus (Ac) A principal middle level cloud type (cloud genus), white or gray, or both white and gray, which occurs as a layer or patch with a wave aspect, the elements of which appear as laminae, rounded masses, rolls, etc. These elements usually are sharply outlined, but they may become partly fibrous or diffuse; they may or may not be merged; they generally have shadowed parts; most of the regularly arranged Altocumulus elements usually have an apparent width of between one and five degrees. |
![]() |