Coastal Skipper and Yachtmaster Quiz · Meteorology
Fog has formed as shown, where warm, moist air is blowing over a colder sea. What type of fog is it, and will a fresh breeze clear it?
A side view of the sea. Two arrows labelled warm, moist air blow from the left across a sea labelled cold sea. A bank of fog lies on the water, with a yacht half hidden inside it.
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Advection fog: it can persist even in a fresh breeze. Advection fog, or sea fog, forms when warm, moist air moves over colder water and is cooled to its dew point. It can form at any time of day and often persists in a fresh wind. It usually takes a change of air mass or wind direction to clear it, though a strong wind can lift it into low cloud. Radiation fog is the kind that forms over land on calm, clear nights and drifts down rivers.
