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Which physical air mass does the dry intrusion consist of?

  • A.Warm subtropical air
  • B.Air that has been dried by precipitation as it ascended within the warm conveyor belt earlier on
  • C.Descending stratospheric air of high potential vorticity
  • D.Cold maritime air drawn from high latitudes behind the surface cold front of the developing system

Answer: C

The dry intrusion is air descending from near the tropopause, carrying high potential vorticity and very low humidity, and its arrival above the surface baroclinic zone is a key step in rapid development. Tracing it in water vapour imagery is standard operational practice. Cold maritime air behind the front is a different and much shallower feature.

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