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Which effect does a very light wind have on radiation fog?

  • A.It prevents the fog from forming at all by mixing warmer air down from above the shallow cooled layer
  • B.It has no effect
  • C.It causes the fog to lift into a layer of low stratus cloud within an hour of its initial formation
  • D.It deepens the fog by mixing the cooling through a greater depth

Answer: D

Perfectly calm conditions produce only dew or a very shallow ground fog, while a light wind of one or two metres per second distributes the cooling through several tens of metres and produces a deeper fog. Stronger winds mix in warm dry air and disperse it. The optimum is narrow, which is part of why fog forecasting is so difficult.

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