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Which typical slope does a mid-latitude front have?

  • A.Close to vertical, since the temperature contrast across a front is concentrated in a narrow zone
  • B.About 1 in 100
  • C.About 1 in 10, which would place the frontal surface at 10 kilometres only 100 kilometres behind it
  • D.About 1 in 1000

Answer: B

Cold fronts slope at roughly 1 in 50 to 1 in 100 and warm fronts more gently at about 1 in 200, so a frontal surface reaching 5 kilometres lies several hundred kilometres behind its surface position. This gentle slope is why warm front cloud extends so far ahead of the surface front. A slope of 1 in 10 would be dynamically unsustainable and 1 in 1000 would produce no recognisable front at all.

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