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PEKKA PARVIAINEN / SCIENCE PHOTO LIBRARY PEKKA PARVIAINEN / SCIENCE PHOTO LIBRARY
Cumulonimbus clouds in the sky over water. Cumulonimbus are large, turbulent clouds which carry rain or hail. The wedge-shaped mass of high cloud at upper centre is known as a hammerhead or thunderhead, and is a clear sign of an impending thunderstorm. Photographed in Finland.
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