Altocumulus castellanus
Cloud
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In meteorology, Altocumulus castellanus or Altocumulus castellatus is a cloud type named for its tower-like projections that billow upwards from the base of the cloud. The base of the cloud can form as low as 2,000 metres, or as high as 6,000... Wikipedia
Abbreviation: Ac cas
Appearance: Middle-altitude Stratocumulus clouds arranged in groups with rising towers, turrets
Precipitation: Virga only
Species: castellanus (castle)