CAT - Used in Abbreviation

"Clear air turbulence" (or CAT as it is called), is caused by air that is disrupted around the jet stream. At the inner most part of the jet stream the velocity may be as high as 250 mph. As you move away from the core, the velocity drops off so that at the edge it may only be 50 mph. At each point at which two differing velocities rub against each other, eddies form causing the airflow to be disrupted. The variability in the disruption will cause variations in the lift produced by an airplane's  wings causing it to bounce. It is this phenomenon (so-called "air pockets") that causes an aircraft to suddenly drop.

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