What is a primary indicator of unstable atmospheric conditions?

Turbulence serves as a primary indicator of unstable atmospheric conditions because it occurs when there’s significant vertical movement of air within the atmosphere. This vertical movement is often a result of rising warm air and descending cooler air, characteristic of unstable air masses. When the air becomes unstable, it can lead to the development of convective currents which are responsible for turbulence.

In contrast, low altitude clouds might indicate moisture and potential weather but do not directly signal instability. High pressure systems are generally associated with stable conditions, as they tend to promote sinking air and clear skies. Stable winds, as the name suggests, indicate a lack of significant atmospheric disturbance that would contribute to instability. Thus, turbulence is the most telling sign of an unstable atmospheric environment, where dramatic shifts in air movement can lead to sudden changes in flight conditions.