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.

they do signify unstable air within the storm. Unlike most clouds, which are formed by rising air, mammatus clouds are formed from sinking air inside the cloud. A scud cloud, or fractus cloud ...

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 ...