Which fog is formed when moist, stable air is forced up a slope and cooled?

The formation of upslope fog occurs when moist, stable air is forced to ascend up a slope, such as a mountain or hill. As the air rises, it experiences a decrease in temperature due to the higher altitude, which leads to cooling. When the air cools to its dew point, it becomes saturated, resulting in fog. This type of fog is particularly prevalent in mountainous regions where topography can significantly influence local weather conditions.

In contrast, advection fog is formed when warm, moist air moves horizontally over a colder surface, causing moisture in the air to condense. Radiation fog develops on clear nights when the ground cools rapidly, causing the air close to the surface to cool and form fog. Steam fog, on the other hand, occurs when cold air passes over warmer water, resulting in evaporation and subsequent condensation in the colder air.

Thus, upslope fog is the most accurate term to describe fog formed specifically by the cooling of moist air as it is lifted along a slope.