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clear air turbulence
avia.	турбулентність атмосфери при ясному небі; турбулентність ясного неба
clear-air turbulence ['klɪə 'ɛə 'tə:bjuləns]
avia.	турбулентність за ясного неба
English thesaurus
clear air turbulence
avia., Canada	Turbulence encountered in air where no clouds are present. This expression is commonly applied to high- level turbulence associated with wind shear WS. CAT is often encountered in the vicinity of the jet stream.