What is typically indicated by a Low-Pressure System?

A Low-Pressure System is typically associated with unstable and stormy weather conditions. This is because, in a low-pressure environment, air tends to rise, leading to the cooling of air as it ascends. The cooling results in condensation and the formation of clouds, which can lead to precipitation and even severe weather events like thunderstorms. Low-pressure systems can create the necessary conditions for turbulent weather patterns, including strong winds and storms, making them crucial to monitor in aviation.

Clear skies with no precipitation, as mentioned in one of the choices, typically occur in high-pressure systems where air sinks and stabilizes, not in low-pressure environments. Similarly, stable weather conditions and decreases in air traffic are not direct indicators of low-pressure systems; rather, they are more associated with high-pressure areas where flight operations may be smoother due to prevailing clear and calm weather.