Altocumulus

(Section 2.5.2.4)

Altocumulus most frequently occurs at altitudes between 2 km and 4 km (6 500 ft and 13 000 ft) in polar regions, between 2 km and 7 km (6 500 ft and 23 000 ft) in temperate regions and between 2 km and 8 km (6 500 ft and 25 000 ft) in tropical regions.

Altocumulus may be observed in several forms, the most important of which are described below.