What vertical wind shear is considered critical for the probability of turbulence?

The critical threshold of vertical wind shear for the probability of turbulence is recognized as being 6 knots or more per 1,000 feet. When wind shear reaches this level, it can create significant variations in wind speed and direction with altitude, which contributes to turbulence experienced by aircraft during flight. This level of shear can disrupt the stable airflow around the aircraft, leading to the uneven forces that create the bumps and jolts associated with turbulence.

Understanding this threshold is crucial for pilots and dispatchers, as it directly influences pre-flight planning and in-flight decision-making. Awareness of vertical wind shear conditions helps crews anticipate potential turbulence encounters, allowing them to alter flight paths if necessary to maintain safety and passenger comfort.