Discussion
Conditions favorable for the formation of fog are :
Answer: D
Fog favours RH 80%, clear sky, light wind and a stable atmosphere.
Radiation fog, the commonest type over land, forms on long nights with clear skies, when the ground loses heat rapidly and cools the moist air above it to its dew point. A light wind mixes the cooling through a shallow layer without dispersing it, and a stable atmosphere, often with a surface inversion, keeps the cold, moist air near the ground.
A cloudy sky reduces night-time cooling, and an unstable atmosphere mixes the moist surface air upward, so the options with cloud or instability do not favour fog.
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