![](http://www.alamy.com/thumbs/6/EA765B78-8EA0-442F-A182-8FAB659A04EA/TBTF9G.jpg)
Mammatus Clouds Cumulonimbus. Clouds Mammatus are a grouping of clouds, which usually indicate the imminence of a storm.
Size: 9210px × 2619px
Photo credit: © Orazio Puccio / Alamy / Afripics
License: Royalty Free
Model Released: No
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