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Which condition is required for radiation fog to form?

  • A.Warm dry air
  • B.A strong temperature inversion already present at the surface before the sun sets in the evening beforehand
  • C.Clear skies light winds and moist air
  • D.Overcast skies with strong winds, which allow the surface to cool rapidly by radiating to the cloud above

Answer: C

The ground must cool efficiently, which requires clear skies, and the air must be nearly calm so that only a shallow layer is cooled, yet moist enough to reach saturation. Very light wind of one or two metres per second actually helps by mixing the cooling through a sufficient depth. Cloud cover prevents the radiative cooling entirely.

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