Cumulonimbus Pileus Cloud
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Cumulonimbus Pileus Cloud

by Bastian Kirsch

Pileus clouds are fine and transient layers of condensed water vapour that appear as thin caps atop of towering cumulus clouds. They form through the lifting of moist air layers by strong convective updrafts and often indicate the transition into a cumulonimbus cloud that is capable to produce severe weather.