- Cloud types, Acc: a sheet of thick Altocumulus Castellanus clouds
- W010176Z
- Cloud types, Acc: a sheet of thick Altocumulus Castellanus clouds is composed of numerous parallel strips aligned with the flow. The dark, narrow bases suggest tall turrets above them. A flat cloud sheet formed initially when outflow air provided lift for the air above the boundary surface. Once formed, the cloud began to convect and thicken in lines in the unstable air mass.
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