Advection Fog

Advection fog forms when warm moist air flows over a cold surface. It can occur over land or sea.

Conditions necessary for it to form are:

  • A wind of up to 15 kt (20 kt over the sea).
  • A high relative humidity so little cooling is required to bring the air to saturation.
  • The cold surface over which the air moves must have a temperature lower than the dewpoint of the warm moist moving air.

Advection fog is common over land areas in winter and early spring when the land is colder than the sea and oversea areas in late spring and early summer when the land becomes warmer than the sea.

The conditions necessary for advection fog to form

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