- Cloud types, Cb: an underside view of a Cumulonimbus cloud
- W033494S
- Cloud types, Cb: an underside view of a Cumulonimbus cloud with a heavy rain curtain. Higher parts of the storm catch skylight and are lighter, while lower clouds are shaded and dark. The storm is propagating to the right, as seen by the dense rain there, compared with the older showers at left.
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