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Which pattern on a thickness chart indicates a frontal zone?

  • A.A tight packing of thickness contours
  • B.A closed centre of high thickness surrounded by contours of steadily decreasing value outward from it
  • C.Widely spaced contours
  • D.A col in the thickness field where the gradient falls to zero between two maxima and two minima

Answer: A

A front is a concentrated temperature gradient, so it appears on a thickness chart as a band of tightly packed contours, sometimes called a thermal ribbon. The associated thermal wind is correspondingly strong, which is the frontal jet. A closed high thickness centre is a warm air mass, widely spaced contours indicate a uniform air mass, and a col in thickness is a region of weak thermal gradient rather than a front. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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