There's more to clouds than 'dull or grey' and 'white and fluffy': These incredible pictures show the variety of our sky By DAILY MAIL REPORTER Published: 07:20 EDT, 23 August 2012 | Updated: 07: ...

Clouds of smoke and flame. Cumulus clouds take their name from the Latin word "cumulo," meaning "heap" or "pile." The fluffy, white cumulus clouds that commonly appear in the sky form when hot ...