What weather conditions can be expected beneath low-level temperature inversion when humidity is high?

Low-level temperature inversions occur when a layer of warm air traps cooler air near the surface, which can lead to specific weather phenomena, especially when humidity is high. Under these conditions, the air becomes stable, inhibiting vertical mixing. This stability typically results in smoother flying conditions, as there is less turbulence compared to conditions with more dynamic air masses.

Additionally, high humidity in conjunction with temperature inversions often leads to the formation of fog or low clouds, causing reduced visibility. As the cooler air is trapped and cannot rise, the moisture condenses into tiny water droplets, resulting in obscuration. Thus, smooth air with poor visibility is a characteristic outcome of such inversions, corroborating the choice.

In contrast, other weather phenomena like strong winds and thunderstorms, clear skies with high visibility, or heavy precipitation and storms do not align with the expected effects of a low-level temperature inversion under high humidity conditions. These phenomena generally require dynamic atmospheric conditions that promote mixing, unlike the stability created by an inversion layer.