Keen photographer Garry Hornby spotted them above Huntington in York and posted: "Stunning mammatus clouds over Huntington ...

These rare arcs bestow a serene ... witness a formation of clouds so unique that they seem otherworldly. Mammatus clouds, with their characteristic pouch-like protrusions, typically form beneath ...

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 ...

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 ...