[Ref AC 00-6B 17.2.3.2, AC 00-30C 6.5]

What’s CAT (Clear Air Turbulence)?

Clear Air Turbulence (CAT) is a higher altitude turbulence phenomenon occurring (from 20,000 to 50,000 feet) in cloud-free regions associated with wind shear.

CAT can occur between the core of a jet stream and the surrounding air. It can often affect an aircraft without warning. CAT frequency and intensity are maximized during winter when jet streams are strongest.

 

 

Read More –

Where is a likely location of CAT?

How can we expect encountering CAT?

What speed should be used if we encounter CAT?