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Which of these statements about steam fog are correct or incorrect?

1. Steam fog is formed in air with cold air mass properties
2. Steam fog is formed only in windless conditions

  • A
    1 is not correct, 2 is correct
  • B
    1 is correct, 2 is not correct
  • C
    1 and 2 are correct
  • D
    1 and 2 are not correct

Refer to figure.

STEAMING FOG (ARCTIC SMOKE). occurs over sea, mainly in polar regions.

  • It is caused when cold air from a land mass moves over a (comparatively) warmer sea (water surface) = advection of very cold air over a warm sea. The small amount of evaporation from the sea is enough to cause saturation and condensation.
  • Steam fog is typically up to 500 feet thick and may drift inland. The fog can be persistent and up to 500 feet thick - may drift inland.
  • Forms in conditions of no wind or very light winds. Will be dispersed by an increase in wind speed or change of direction.

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