- Thickening Cumulonimbus storm cloud anvil
- W874029S
- Cloud types, Cb: a Cumulonimbus cloud fills the sky with a thickening anvil that slopes down toward a darker region, sometimes with lower clouds, where precipitation is concentrated. All the different cloud forms and shades belong to the Cumulonimbus which is considered a cloud system with a main convective component and various accessory or associated other clouds.
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