Figure 1-22.—Typical altocumulus cloud.
with altostratus clouds. Mock suns or pillars, without
the surrounding halo, indicate high level altocumulus
stratocumulus clouds. Irisation may occur with
cirrocumulus clouds.
pastel shading of cloud element edges with colors of the
clouds composed mainly of ice crystals. Irisation, the
spectrum, occurs in ice crystal clouds, which, based on
the known freezing level, may help rule out
and have more varieties than any other cloud form. The
Altocumulus clouds are classified in four species,
four species of altocumulus clouds are altocumulus
castellanus, altocumulus floccus, altocumulus
stratiformis, and altocumulus lenticularis. The
Figure 1-23.—Typical cirrocumulus cloud.
1-21
