Cb cap

Cumulonimbus capillatus
species of Cumulonimbus

Cumulonimbus characterized by an upper portion having cirriform parts of clearly fibrous or striated structure, frequently in the shape of an anvil (Cumulonimbus capillatus incus), a plume or a vast more or less disorderly mass of hair. In very cold air masses the fibrous structure very often extends virtually thoughout the cloud.

Cumulonimbus capillatus is usually accompanied by a shower or by a thunderstorm, often with squalls and sometimes with hail; it frequently produces very distinct virga.