A rapid change in wind speed and/or direction in a short distance, existing in a horizontal and/or vertical direction.

• A. Gust Front
• B. Microburst
• C. Wind Shear
• D. Turbulence

Answer: (C)

Wind shear is a rapid change in wind speed and/or direction over a short distance, and it can occur in horizontal or vertical directions. This means you can move a short distance and experience a noticeable shift in how fast the air is moving or which way it’s blowing, at the same altitude or as you climb or descend. In aviation, wind shear is especially important because sudden shifts can affect airspeed and flight control, making it harder to maintain the desired flight path.

Gust fronts are the leading edges of a thunderstorm outflow, bringing a sharp increase in wind at the surface as the storm's air spreads out. Microbursts are very intense, small-scale downdrafts that hit the surface with strong, concentrated winds. Turbulence refers to irregular, chaotic air motion that can accompany all sorts of weather but isn’t defined by a rapid, systematic change in wind speed or direction over a short distance in the same way wind shear is.