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.

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