clear-air turbulence

clear-air turbulence (klîrâr)

n. Abbr. CAT

Atmospheric turbulence that occurs under tranquil and cloudless conditions and subjects aircraft to strong updrafts and downdrafts.

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clear-air turbulence  (klîrâr)

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.

Thesaurus

Noun

1.

clear-air turbulence - strong turbulence in an otherwise cloudless region that subjects aircraft to violent updrafts or downdrafts turbulence - instability in the atmosphere