American Meteorological Society Certification (AMS) Practice 2026 - Free Practice Questions and Study Guide

Altocumulus clouds are classified as medium-level cumulus clouds. They typically form between 2,000 and 7,000 meters above sea level and are characterized by their white or gray color, often appearing as patches, waves, or a layer with a textured appearance. The term "altocumulus" itself indicates that these are cumulus clouds that are found at an intermediate altitude.

These clouds often indicate instability in the atmosphere and can be precursors to thunderstorms, although they are generally not storm clouds themselves. Their formation is influenced by the rising of moist air, which results in the development of the characteristic fluffy appearance typical of cumulus clouds at medium levels. Therefore, identifying altocumulus as medium-level cumulus clouds accurately reflects their altitude and characteristics within cloud classification systems.