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Ever Seen One of These in the Sky?

Okay, that's one sinister looking cloud. Reverse course! Abandon ship!
Photographer: Capt. Andreas M. van der Wurff Summary Author: Capt. Andreas M. van der Wurff; Jim Foster The photo above showing a sinister looking roll cloud was taken aboard ship while en route from ...
Citizen Gold's profile photoJeff Brown's profile photo
Spectacular photos in both posts. Sounds like the same type of clouds with different or additional labels used. 
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