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 alt-tudes near jet streams, mountain ranges, and developing storm systems. it subjects aircraft to strong updrafts and downdrafts.

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