advection fog

noun Meteorology.
fog caused by the movement of warm, moist air over a cold surface.

Origin:
1940–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Advection fog forms when humid air flows over cold ground or water.
Advection fog is fog that is formed elsewhere and then transported
  horizontally, eg to a mountain range.
Common advection fog caused by transport of moist air over a cold body of water.
Advection fog is the fog that arises from the movement of humid air over a
  surface that is already cool.
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