What weather conditions are expected beneath a low-level temperature inversion layer when humidity is high?

Beneath a low-level temperature inversion layer, air that is trapped can lead to specific weather phenomena when humidity is high. A temperature inversion occurs when warmer air sits above cooler air at the surface, preventing vertical mixing. This situation often leads to a stable atmosphere. When humidity is high, the cooler air can lead to condensation, forming fog, haze, or low clouds. This results in smooth air due to the lack of mixing that typically causes turbulence, but the downside is that visibility tends to be poor due to the presence of fog and haze.

Thus, this combination of factors—smooth air and reduced visibility from the resulting fog and haze or low clouds—accurately captures the expected weather conditions in such a scenario. Other potential conditions such as turbulent air or clear skies would not be present due to the stabilizing effect of the temperature inversion, particularly in high humidity situations.