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Amazing and rare natural phenomenon.

a Resident of Vienna Austrian named Manuel VI in early June, photographed in the sky unusual clouds, reminiscent of balloons or a kind of cell. They appeared after the storm and looked pretty scary.

Intense mammatus cloud formations over Vienna, Austria yesterday.

Photos by Manuel We. Posted with permission. pic.twitter.com/yxw8BlFURw

These clouds are called videobrasil and are considered a rare natural phenomenon.

At the end of April looks like a cloud could be seen by the inhabitants of the American city of Tulsa, in Eastern Oklahoma.

Catherine Gura

Even more interesting about the nature