Pyrocumulus
Literally means fire cloud. These clouds are produced when a smoke column created by a wildland fire caps out (has an ice cap) creating in all intents and purposes a cumulonimbus cloud. These clouds have been known to produce lightning, hail, light precipitation and on occasions have been known to put out the fire.
Pyrocumulus by Alistair MacIlherron September 21, 2009
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