Clear-Air Turbulence (often abbreviated CAT and sometimes colloquially referred to as "air pockets") is the erratic movement of air masses in the absence of any visual cues (such as clouds).
clear-air turbulence"(Abbreviated CAT.) A higher altitude (6-15 km) turbulence phenomenon occurring in cloud-free regions, associated with wind shear, particularly between the core of a jet stream and the surrounding air.
Clear-air turbulence Turbulence encountered by aircraft when flying through air space devoid of clouds. Thermals and wind shear are the main causes. Clinometer An instrument for measuring angles of inclination.
CAT - Abbreviation for clear-air turbulence.
catch - The amount of precipitation captured by a rain gauge.
CCL - Abbreviation for convective condensation level.
 See also: Clear, Cloud, Turbulence, Clouds, High
  
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