What type of fog is associated with the passage of a warm front?

Frontal fog is specifically linked to the presence and movement of warm fronts. As warm, moist air is forced to rise over a cooler air mass, it cools down, which can lead to condensation and the formation of fog. This type of fog typically occurs in the warm air associated with a warm front, where the rising air can reach its dew point, resulting in the visibility-reducing phenomenon known as fog.

Advection fog also plays a role here; it forms when warm, moist air moves over a cooler surface, such as water or cold land. When this warm air comes in contact with the cooler surface, it cools down, causing moisture to condense into fog. This is particularly common along coastlines but can also occur inland when warm air crosses cooler terrain.

Together, frontal fog and advection fog highlight the processes that lead to reduced visibility in the presence of warm fronts, making this combination the correct choice for the question regarding fog associated with the passage of a warm front.