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Which of the following circumstances most favours the development of orographic fog?
  • A
    Katabatic winds
  • B
    High relative humidity
  • C
    Clear nights
  • D
    Absolutely unstable air

Refer to figure.

HILL/OROGRAPHIC FOG. Usually stratiform cloud (ST, SC) whose base is lower than the summit of the hills.

  • Formed when humid stable air is forced to ascend along the side of a mountain or hill or by the normal turbulence action producing ST and SC.
  • Formed during the day or night.
  • As the air rises, it cools adiabatically => condensation level is reached, and a cloud is formed.
  • Hill fog requires a wind up the slopes of a mountain and is promoted by high humidity. The hill fog quickly disappears if the wind changes.

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