For a few fleeting moments this evening there were the most incredible cloud formations in the sky. Apparently these are mammatus clouds (also known as mammatocumulus meaning “mammary cloud” or “breast cloud” – thank you Wikipedia), and are all to do with when heat and moisture mix and a nodule forms under an anvil cloud. No, I don’t know what that means either but I feel a google coming on for the rest of the evening. Thunderstorms are implicated along the way I believe.

However they are formed, they were rather spectacluar

Mammatus under an anvil cloud. Apparently!