At what conditions is wind shear usually found near the ground?

Wind shear is a significant phenomenon that occurs when there is a variation in wind speed or direction over a short distance. It is most commonly found near the ground during specific atmospheric conditions. One of the primary circumstances under which wind shear occurs is associated with thunderstorms. Thunderstorms generate powerful updrafts and downdrafts, leading to rapid changes in wind velocity and direction both as the storm develops and as it dissipates.

Additionally, wind shear can be influenced by physical obstructions, such as mountains or tall buildings, which can disrupt the flow of wind and create localized variations. This is particularly relevant in areas where topographical features funnel wind or create turbulence. The combination of these factors contributes to hazardous conditions for aircraft, especially during takeoff and landing phases, where pilots must be aware of potential changes in wind conditions.

Other options reflect incorrect contexts for wind shear occurrences. Stable atmospheric layers or high-temperature zones are less conducive to the rapid wind changes associated with wind shear. Similarly, wind shear is not typically found exclusively at high altitudes during the day, as it is more prominent in localized areas near the surface. Understanding these relationships helps in recognizing the importance of monitoring wind conditions during flight operations.