- Cloud types, Cb: this Cumulonimbus cloud is a severe storm
![Cloud types, Cb: this Cumulonimbus cloud is a severe storm](http://www.skyartstock.com/peas/W940956S-SKYART.jpg)
- W940956S
- Cloud types, Cb: this Cumulonimbus cloud is a severe storm with a line of growing towers (flanking line) feeding into it at lower left, then rising to join and maintain the anvil. A closer look at the left side of the anvil reveals several superimposed layers where updrafts have retained some of their individuality as they merged.
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