- Patch of black scud cloud, like a wave cloud
- W873909S
- A strange, black scud cloud patch stands out starkly against a bright, distant Cumulonimbus in blue sky. Air moistened by showers (behind) has interacted with uneven terrain to cause local lifting here. The small wedge with a smooth top is like a wave cloud and shows that the air has a discontinuous vertical moisture profile (suddenly dry above moist).
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