- Cloud types, Acc: how to recognize the Castellanus cloud type
- W002728Z
- Cloud types, Acc: how to recognize Castellanus cloud type. The straight base segments of this Altocumulus Castellanus sheet blend and flow together. Long, dark cloud bases that are relatively narrow but close together are always a sign of mid-level instability where the updrafts originate only within the clouds and not from near the ground. The key difference of these Castellanus clouds from Cumulus is the higher bases, smaller apparent extent per strip or element, and slightly less dark undersides.
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