What kind of clouds would you NOT expect in the presence of fog?

Cumulus clouds are generally associated with fair weather and are formed by the rising of warm air, which creates a vertical development. In contrast, fog occurs when air near the surface cools and becomes saturated with moisture, often resulting in very stable atmospheric conditions. This lack of vertical motion means that the kind of clouds typically observed with fog tend to be low-lying and stratiform, such as stratus or nimbostratus. These clouds form at lower altitudes and are more associated with moisture and overcast conditions rather than the towering, puffy appearance of cumulus clouds.

In the context of fog, it is the stable and moist conditions that prevent the formation of cumulus clouds, making them unlikely to be present at the same time as fog. On the other hand, cirrus clouds, although high-altitude and thin, can exist without affecting the presence of fog, and stratus clouds are often directly linked to fog as they represent a layer of cloud at low altitudes. Nimbostratus clouds, which can produce steady precipitation, can also coexist with fog due to their extensive horizontal coverage and low base. Thus, cumulus clouds would not be anticipated in the presence of fog, reinforcing why this answer is the most valid