clear air turbulence

clear-air turbulence

[kleer-air]
noun
atmospheric turbulence, sometimes severe, occurring in air devoid of clouds or other visible indicators that turbulence might be present. Abbreviation: CAT

Origin:
1950–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
clear-air turbulence   (klîr'âr')  Pronunciation Key 
Atmospheric turbulence that occurs under tranquil and cloudless conditions at high altitudes near jet streams, mountain ranges, and developing storm systems. It subjects aircraft to strong updrafts and downdrafts.
The American Heritage® Science Dictionary
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