Clear-air-turbulence meaning

klîrâr
Atmospheric turbulence that occurs under tranquil and cloudless conditions and subjects aircraft to strong updrafts and downdrafts.
noun
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Turbulent air, not associated with a storm, that affects the flight of aircraft.
noun
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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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