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Which separation between the two curves indicates dry air?

  • A.A large separation
  • B.A small separation, since the closeness of the two curves shows that little water vapour is present in the layer
  • C.No separation
  • D.A separation that varies rapidly with height, indicating that the layer has recently been mixed by turbulence

Answer: A

The horizontal distance between the temperature and dew point curves is the dew point depression, so a wide separation means the air is far from saturation and therefore dry. Where the curves coincide the air is saturated and cloud is present. Reading the depression at a glance is the quickest way to identify cloud layers and dry intrusions on a sounding. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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