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 ?
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.