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4. Cloud Families

a. Low Clouds. Stratus (St) and stratocumulus (Sc) clouds are in the low cloud group.

The bases of these clouds range from near the surface to about 6,500 feet. Low clouds are
almost entirely water but the water may be cooled to below freezing temperatures.

They can contain snow and ice particles.

b. Middle Clouds. Middle clouds are the altostratus (As), altocumulus (Ac), altocumulus
castellanus (Accas), and some nimbostratus (Ns) clouds. The height of the bases of these
clouds ranges from about 6,500 to.23,000 feet. The clouds are primarily water but they can
contain ice particles.