Which fog type is most commonly associated with warm fronts?

Frontal fog, also known as precipitation-induced fog, occurs when warm, moist air moves over a cooler surface, typically ahead of a warm front where the warm air rises over the cooler air. This type of fog is often associated with the weather conditions that accompany warm fronts; as the warm air rises, it cools and moisture within it can condense to form fog.

When a warm front approaches, it brings light rain which can saturate the cooler air below. This saturation process, combined with the cooling from the rising air, creates an environment conducive to the formation of fog. The resulting visibility can be markedly reduced, impacting travel and outdoor activities. This makes frontal fog the most common type associated specifically with warm fronts, as opposed to other types of fog that may form under different atmospheric conditions.

Other options like ice fog, steam fog, and upslope fog are associated with different weather phenomena and environmental conditions, which do not align with the warm frontal context as closely as frontal fog does.