Frontal Fog MET

Frontal fog is a bit more complicated than the other types of fog. Rain falls from cloud aloft. As it falls, the temperature increases, evaporating some of the water to vapour. This increases the amount of vapour in the air, eventually making it saturated, at which point it condenses again and becomes fog. This situation is often present at warm fronts and can happen at any time of day or night. Although the other methods of removing fog will work, the obvious way that frontal fog is dispersed is that the front itself moves elsewhere.

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What is the cause of frontal fog?
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