Turbulence is most likely when there is strong vertical air movement or wind shear.

Turbulence is most likely when there is strong vertical air movement or wind shear.

• A. Very calm air with no wind.
• B. Convective activity is the only cause.
• C. Strong vertical air movement or wind shear.
• D. Turbulence cannot be anticipated.

Answer: (C)

Turbulence comes from irregular air motions, especially when air moves strongly in the vertical or when wind speed and direction change rapidly with height or across a short distance. Strong vertical motion, like rising warm air (thermals) or downdrafts near convective activity, stirs the air and creates bumps as a aircraft moves through different air speeds and directions. Wind shear adds to this by putting layers of air next to each other that move differently; crossing those layers gives abrupt changes in lift and attitude, which feels like turbulence. So when you have significant vertical motion or notable wind shear, turbulence is likely. Calm, motionless air tends to be smooth, with little disturbance for an aircraft. Convective activity is a common source of turbulence, but it isn’t the only cause—wind shear and other mechanisms can produce turbulence even without visible convection. And turbulence can be anticipated to some extent with weather forecasts and reports, so it isn’t something that cannot be foreseen.

Turbulence comes from irregular air motions, especially when air moves strongly in the vertical or when wind speed and direction change rapidly with height or across a short distance. Strong vertical motion, like rising warm air (thermals) or downdrafts near convective activity, stirs the air and creates bumps as a aircraft moves through different air speeds and directions. Wind shear adds to this by putting layers of air next to each other that move differently; crossing those layers gives abrupt changes in lift and attitude, which feels like turbulence. So when you have significant vertical motion or notable wind shear, turbulence is likely.

Calm, motionless air tends to be smooth, with little disturbance for an aircraft. Convective activity is a common source of turbulence, but it isn’t the only cause—wind shear and other mechanisms can produce turbulence even without visible convection. And turbulence can be anticipated to some extent with weather forecasts and reports, so it isn’t something that cannot be foreseen.