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Which name is given to the band of strong thickness gradient?

  • A.A dry intrusion, which is the descending stratospheric air visible on water vapour satellite imagery
  • B.A thermal ribbon
  • C.A trough of low pressure, along whose axis the flow curves cyclonically and converges at low levels
  • D.A ridge

Answer: B

Forecasters speak of the thermal ribbon or thermal wind maximum where thickness contours pack together, and the upper jet lies along it. Identifying the ribbon is a standard step in locating the baroclinic zone in which development is most likely. Troughs and ridges are features of the height field, and a dry intrusion is a signature of descending stratospheric air seen in satellite imagery.

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