Which condition may indicate windshear?

Windshear refers to a sudden change in wind speed or direction over a short distance, which can pose significant challenges during takeoff and landing phases of flight. Thunderstorm activity is known to create severe windshear due to the turbulence associated with updrafts and downdrafts within the storm. These changes in wind flow can be intensified by the gust front, which is the outflow boundary produced by a thunderstorm as it descends towards the ground. When this boundary spreads out, it can cause abrupt shifts in wind direction and speed, leading to conditions that are consistent with windshear.

In contrast, clear weather conditions typically do not produce the turbulent airflow associated with windshear. Fog and mist, while potentially affecting visibility, do not directly relate to changes in wind flow. Steady wind from one direction suggests consistent airflow without the disturbances that would indicate windshear. Thus, the presence of thunderstorms and their associated gust fronts is a clear indicator of the potential for windshear.