Cumulonimbus thunderstorm cloud,artwork. Cumulonimbi are large,turbulent clouds which carry rain or hail. They usually form from cumulus clouds at a much lower height,which grow vertically instead of horizontally. The flat anvil-like mass of high cloud at upper centre,known as an anvil dome or thunderhead,is a clear sign of an impending thunderstorm. It forms because the cloud has reached the tropopause,the barrier between the troposphere and the stratosphere,and cannot rise any higher into the warmer air above it | |
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