It is common enough in summer to see a cumulonimbus cloud with a top flattened like an anvil. This is because the cloud has reached the ceiling of the troposphere where it is usually held, but some energetic storms can punch through the troposphere ceiling and enter the stratosphere where the cloud cools to below freezing.
ZG: 5
This is a weather phenomenon that may await us.
This is one for the people who are fascinated by clouds, although we should all perhaps register it as another indicator of climate change.
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