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clear-air turbulence

[kleer-air] /ˈklɪərˈɛər/
atmospheric turbulence, sometimes severe, occurring in air devoid of clouds or other visible indicators that turbulence might be present.
Abbreviation: CAT.
Origin of clear-air turbulence
1950-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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clear-air turbulence in Science
clear-air turbulence
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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