Final answer:
On the south aspect of a slope, mid-afternoon winds are typically strong upslope winds due to the heating of the slope by the Sun, while midnight winds are strong downslope winds as the slope cools and the cool air descends. The correct option is B.
Step-by-step explanation:
On the south aspect of a slope, the typical behavior of mid-afternoon slope winds and midnight winds can be understood by examining the heating and cooling effects of the Sun's position in the sky.
During the mid-afternoon, the Sun is high and the south-facing slope receives intense sunlight, heating the air above the slope.
This warm air rises, creating an upslope wind as it is replaced by cooler air from lower elevations or the valley. Therefore, B) Mid-afternoon winds are strong upslope winds, while midnight winds are strong downslope winds occurs.
At midnight, the slope has cooled, and the cooler, denser air above the slope begins to sink, generating downslope winds. This phenomenon is similar to the sea breezes mentioned, where land heats up faster during the day and cools down faster at night compared to the ocean. The correct option is B.