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Old 20th Mar 2016, 12:19
  #262 (permalink)  
airman1900
 
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cumulonimbus

From the U.S. Federal Meteorological Handbook Number 1 - Surface Weather Observations and Reports:

FMH-1

cumulonimbus. An exceptionally dense and vertically developed cloud, occurring either isolated or as a line or wall of clouds with separated upper portions. These clouds appear as mountains or huge towers, at least a part of the upper portions of which are usually smooth, fibrous, or striated, and almost flattened.
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