One of the most awe-inspiring aspects of the storm was the appearance of mammatus clouds. These pouch-like formations hung ominously from the sky, resembling a series of upside-down bubbles.

Formed by cold air sinking down, mammatus clouds are usually seen when there is turbulence in a cumulonimbus cloud. Two astronauts are returning home after nine months in space. Nick Beake of the ...

Mammatus clouds are some of the most photographed clouds ... typically beneath the anvil clouds. They often form in groups that can extend hundreds of miles in any direction, and while they ...

Unusual mammatus clouds were spotted on Wednesday morning in parts of the United Kingdom. The name mammatus comes from the Latin mamma which means 'udder' or 'breast'. The bulging cloud was made ...