It is possible to estimate the likelihood of the formation of fog from observations of air temperatures, wind and direction and other weather signs, plus a knowledge of sea temperatures to be expected on the course ahead. Generally, the daily change in sea surface temperature is less than 0.5 degrees. In ocean regions, well away from the shallows and coastal waters, the sea surface temperature changes very little through solar heating or night radiation. This type forms when moist air moves over an already cold surface and cools from below so that the temperature reaches its dew point the air gets saturated and. The English Channel is often affected by advection fog when south-westerly winds reach the British Isles from the Azores in spring and early summer.
Forum discussions with the word(s) advection fog in the title. The warm, moist, southerly airstream flowing over this is cooled below its dew point to form advection, or sea fog. Meteorologyfog caused by the movement of warm, moist air over a cold surface. Below: Advection St/fog in Central Europe and on the North Sea. Brighter spots indicating thicker and more persistent cloud may be carried downwind, while the upwind edges of cloud will clear more rapidly. One is off the Grand Banks of Newfoundland where the cold Labrador Current causes a decrease in sea temperature. Advection Fog has the same tendency to sink from the outer edges as Radiation Fog, but the advection of the clouds has to be taken into account. There are only certain localities where such conditions are relatively prevalent. Advection Fog has the same tendency to sink from the outer edges as Radiation Fog, but the advection of the clouds has to be taken into account. Moisture Advection Transport of moisture by horizontal winds. Cold Advection Transport of cold air into a region by horizontal winds. Advection Fog A fog that forms when warm air flows over a cold surface and cools from below until saturation is reached. The latter will be below the dew point of the air and normally the wind speed will be between 4 and 16 knots. ADVCTN)- Transport of an atmospheric property by the wind. Advection fog is the most widespread type likely to be encountered at sea and is caused by relatively warm air being cooled by flowing over a cooler sea surface.
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