If a briefing indicates a low-level temperature inversion with high humidity, what weather can be expected?

A low-level temperature inversion with high humidity typically leads to stable atmospheric conditions where warm air traps cooler air near the surface. This can prevent the vertical mixing of air, which is essential for clearing out moisture and pollutants. Under these circumstances, the air remains smooth, but the high humidity can contribute to poor visibility due to fog or haze forming at the ground level. Therefore, the expectation of smooth air combined with such visibility restrictions aligns with the scenario described in the question.

Clear skies would not be typical in this scenario, as moisture in the air tends to lead to clouds, fog, or haze. Windy conditions and turbulence are more likely found in unstable air masses, not under an inversion where the movement of air is restricted. Stormy weather, while possibly related to broader atmospheric conditions, does not specifically describe the stable and moist nature of an inversion. Thus, the combination of smooth air and poor visibility is the most accurate outcome in the presence of a low-level temperature inversion with high humidity.