Clear-air turbulence
atmospheric turbulence, sometimes severe, occurring in air devoid of clouds or other visible indicators that turbulence might be present.
Abbreviation: CAT.
clear-air turbulence
(klîr’âr’)
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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free from darkness, obscurity, or cloudiness; light: a clear day. transparent; pellucid: clear water. without discoloration, defect, or blemish: a clear complexion; a clear pane of glass. of a pure, even color: a clear yellow. easily seen; sharply defined: a clear outline. distinctly perceptible to the ear; easily heard: a clear sound. free from hoarse, […]
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formed with or having clearly defined outlines: a face with clear-cut features. unambiguously clear; completely evident; definite: His sale of secrets was a clear-cut example of treachery. of or relating to a section of forest where all trees have been cut down for harvesting. a section of forest where all trees have been cut down […]