anvil cloud


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anvil cloud

n.
The upper portion of a well-developed cumulonimbus cloud that has reached an altitude at which high lateral winds blow across the top of the cloud, creating a flat anvil shape.

anvil cloud

or

anviltop

n
another name for a cumulonimbus cloud, which tends to be anvil-shaped
References in periodicals archive ?
Additionally, clear air turbulence may be encountered 20 or more miles from the anvil cloud edge." The AC also cautions that hail "may extend to as much as 20 miles from the echo edge."
You must avoid not only the precipitation areas by 20 miles, but the anvil cloud formation, too.
When it grows tall with a flat, spreading top like this, it's often called an anvil cloud. (It's shaped like the iron tool a blacksmith uses.)