In which area is upslope fog most likely to develop?

Upslope fog is most likely to develop in mountainous and hilly areas due to the specific meteorological conditions that occur in these environments. When moist air moves upslope along the side of a mountain, it cools as it rises. When the air temperature drops to its dew point, condensation occurs, leading to the formation of fog. This process is known as adiabatic cooling, which is particularly effective in hilly and mountainous terrain where air is forced to rise.

In contrast, flat plains typically do not have the topographical features necessary for upslope air movement, making fog formation less likely to occur in this manner. Urban cities, while they can create microclimates due to heat, do not generally provide the necessary conditions for upslope fog. Coastal regions might experience fog due to different mechanisms, such as temperature inversions or maritime influences, but these are not classified specifically as upslope fog, which is tied directly to elevation changes in mountainous areas.