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Which condition allows advection fog to persist in wind?

  • A.The wind prevents the fog droplets from settling out, which would otherwise clear the layer within an hour
  • B.Cooling from below continues as long as the air keeps moving over the cold surface
  • C.The wind mixes the fog upward so that it becomes deeper and therefore harder for the sun to burn off later
  • D.There is no such condition

Answer: B

The cooling is supplied continuously by the surface as fresh air is advected over it, so moderate wind sustains rather than destroys the fog. Radiation fog by contrast requires calm conditions because wind mixes it away. The distinction explains why sea fog can persist for days while land fog often clears within hours.

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