- A dark cloud means rising air: a boundary with a small roll cloud
- W001162Z
- A dark cloud means rising air. The sky is full of showers and outflow currents from all directions. One boundary with a small roll cloud along it begins to convect as converging air streams meet there. Despite being cool, the air is being squeezed and forced upward to condense. The odd cloud looks like a lowering but appears to be detached from the higher base above it.
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