Supplementary features and accessory clouds
(Section 2.1.3.4)A cloud may show supplementary features attached to it, or may be accompanied by accessory clouds, sometimes partly merged with its main body. “Supplementary features” and “accessory clouds” may occur at any level of the cloud, or above or below it.
(Cb) Arcus
(Ac) Asperitas
(Cb) Cauda and Flumen
(Ac) Cavum
(Sc) Fluctus
(Cb) Incus
(Cb) Mamma
(Cb) Murus
(As) Pannus
(Cb) Pileus
(Cb) Praecipitatio
(Cb) Tuba
(Cb) Velum
(Ac) Virga
One or more supplementary features or accessory clouds may be observed simultaneously with the same cloud.