Which of the following is not a turbulence intensity?

Slight turbulence is not recognized as an official category of turbulence intensity within the established grading scale. The classification of turbulence intensity typically includes terms such as light chop, moderate turbulence, and severe turbulence, which serve to clearly identify the varying levels and characteristics of turbulence encountered during flight.

Light chop refers to minor, often slightly noticeable variations in the aircraft’s motion, while moderate turbulence involves more significant changes in altitude and attitude, which can cause strain on passengers and crew. Severe turbulence, on the other hand, presents intense and abrupt changes, making it challenging for pilots to maintain control of the aircraft. The absence of a defined standard for "slight turbulence" means that it does not fit into the established framework of turbulence intensity categorizations.