Wiki143:POTD column/September 13, 2006
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Cumulonimbus capillatus incus cloud floating over Swifts Creek, Victoria in Australia
Cumulonimbus cloud floating over Swifts Creek, Victoria in Australia. Cumulonimbus are tall, dense, and involved in thunderstorms and other bad weather. They are characterized by a flat, anvil-like top and can be tall enough to occupy middle as well as low altitudes.
Photo credit: Fir0002
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