Which in-flight hazard is most commonly associated with warm fronts?

Precipitation-induced fog is most commonly associated with warm fronts because of the way warm fronts interact with cold air masses. When a warm front moves into an area, it causes the warm, moist air to rise over the cooler air that it encounters. As this warm, moist air ascends, it cools and condenses, often producing precipitation. If the precipitation falls through this cooler air mass, it can contribute to the formation of fog at the surface.

This phenomenon occurs because the temperature difference and the moisture from the rising air lead to saturation of the air near the ground. When the cool air near the surface becomes saturated, it can create a thick, low-lying fog, commonly referred to as precipitation-induced fog. This is particularly prevalent in areas where warm fronts bring steady rain, as the moisture can linger and result in visibility issues due to fog.

In contrast, other forms of fog mentioned in the options occur under different conditions, such as advection fog forming when warm moist air moves over cooler surfaces or radiation fog developing overnight as the ground cools and moisture condenses.