What is a typical sign of an impending low-pressure system?

Falling atmospheric pressure, increasing cloud cover, and shifting winds are typical signs that suggest an impending low-pressure system. As a low-pressure system approaches, the atmosphere becomes more dynamic. Falling pressure is an indicator that air is rising, which is a characteristic of low-pressure areas where air tends to converge and ascend. This rising air cools and condenses, leading to increased cloud cover that often precedes precipitation.

Additionally, shifting winds are associated with changes in weather systems. Winds typically begin to flow toward the low-pressure area, which helps to transport moist air that can contribute to cloud formation and precipitation. This combination of falling pressure, increasing cloudiness, and altered wind patterns is a hallmark of the approach of a low-pressure system, setting the stage for potentially significant weather changes.

Other choices presented do not align with the characteristics of a low-pressure system: rising temperatures and clearer skies are often associated with high-pressure systems; consistent wind patterns and static pressure readings indicate stability, which is contrary to what is expected with an approaching low; and decreasing humidity and stable temperatures also suggest prevalent high pressure rather than the dynamic changes brought on by low-pressure conditions.