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Which region of a mid-latitude cyclone shows the strongest large-scale ascent?

  • A.Ahead of the warm front
  • B.Behind the cold front, where the cold advection is strongest and the air is being replaced most rapidly
  • C.In the centre of the associated anticyclone downstream of the cyclone at the same time
  • D.Along the trailing edge of the cloud shield where the dry intrusion is descending from the stratosphere

Answer: A

The warm conveyor belt ascends ahead of the surface warm front, driven by both warm advection and positive vorticity advection aloft, and it produces the broad shield of layered cloud and steady precipitation. Cold advection behind the cold front forces descent, which is why the sky clears there apart from shallow convection. The dry intrusion is precisely the descending stratospheric air. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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