According to the MET Office, mammatus clouds are usually formed in association with large cumulonimbus clouds, with turbulence within the clouds leading to the anvil or bubble-shaped protusions.
Mammatus clouds over Worthing – 20 stunning pictures
Worthing was treated to a stunning display of mammatus clouds at sunset last night.
By Sam Woodman
Published 12th Mar 2021, 09:40 BST