The presence of what kind of weather phenomena can indicate the existence of hazardous wind shear?

Thunderstorms are significant indicators of hazardous wind shear due to the violent and turbulent conditions they create in the atmosphere. Wind shear refers to changes in wind speed and direction with altitude, which can be particularly dangerous for lighter-than-air systems like balloons and airships.

In thunderstorms, strong updrafts and downdrafts can cause abrupt changes in wind direction and velocity, leading to unstable flying conditions. These conditions are often accompanied by gust fronts, microbursts, and other phenomena that contribute to sudden shifts in airflow. This is especially critical for pilots operating in or near stormy weather, as they must be vigilant for the potential of sudden wind changes that can impact both altitude and control of the aircraft.

Other weather phenomena like stable air masses, snowfall, and frontal passages do not typically produce the intense and chaotic wind conditions associated with thunderstorms. While all types of weather can have some impact on flying conditions, thunderstorms are notably linked to the highest degree of turbulence and wind shear, making them a primary concern for aviation safety.