cloud base

noun
the apparent lower surface of a cloud or cloud layer.

Origin:
1950–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  cloud base
Part of Speech:  n sing.
Dictionary.com's 21st Century Lexicon
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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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