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clear-air turbulence

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

First recorded in 1950–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

clear-air turbulence in Science

clear-air turbulence

[klîrâr]
  1. 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.
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