Clouds Formation

Family B includes:
- Genus Altocumulus (Ac): A cloud layer of limited convection usually in the form of irregular patches or rounded masses in groups, lines, or waves. High altocumulus may resemble cirrocumulus but is usually thicker and composed of water droplets so that the bases show at least some light grey shading. Opaque altocumulus associated with a weak frontal or low pressure disturbance can produce very light intermittent precipitation.
+ Species Altocumulus stratiformis (Ac str): Sheets or relatively flat patches of altocumulus.
+ Species Altocumulus lenticularis (Ac len): Lens shaped altocumulus.