cloud base

the apparent lower surface of a cloud or cloud layer.

1950–55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To cloud base's 21st Century Lexicon
Main Entry:  cloud base
Part of Speech:  n sing.'s 21st Century Lexicon
Copyright © 2003-2014, LLC
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Example sentences
After all, the tornado is not merely an appendage to a cloud base.
The only difference between the two kinds is the reversal of polarities in the cloud base.
If you are too far away to see rotation, report as lowering of cloud base.
Visually, a low-hanging cloud base with rotation is often seen.
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