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What is signified if an occlusion is described as "cold"?
  • A
    On meeting the warm front, the cold front moves up the warm frontal surface
  • B
    The air ahead of the associated warm front is colder than the air behind the associated cold front
  • C
    It derives from a polar depression
  • D
    The air ahead of the associated warm front is less cold than the air behind the associated cold front

Refer to figures.

OCCLUDED FRONT. If a cold front catches up to and overtakes a warm front, the frontal boundary created between the two air masses is called and occluded front. When the cold front catches up with the warm front, the warm sector is lifted.

WARM OCCLUSION: the air ahead of the warm front is colder than the air behind the cold front.

  • The cold air behind the cold front rises over colder air ahead of the warm front. The less cold air rises over the leading colder air => Cold front aloft.
COLD OCCLUSION: the air behind the cold front is colder than the air ahead of the warm front.
  • The cold air behind the cold front undercuts the less cold air ahead of the warm front. Warm front aloft.

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