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Which fog forms as warm moist air crosses a cold surface?

  • A.Advection fog
  • B.Steam fog, which instead forms where very cold air moves across water that is considerably warmer than it is
  • C.Radiation fog
  • D.Valley fog, which forms where cold air drains into a hollow overnight and cools below its dew point there

Answer: A

Advection fog forms where air is cooled from below to its dew point, most commonly where warm maritime air crosses a cold ocean current or a snow covered surface. The Grand Banks and the California coast are classic locations. Unlike radiation fog it can persist in moderate winds and can form at any time of day.

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