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Which feature identifies a frontal inversion instead?

  • A.Warming with height accompanied by a sharp fall in dew point, indicating that the air above has descended
  • B.Cooling with height
  • C.An isothermal layer with a constant dew point through its whole depth, indicating thorough turbulent mixing
  • D.Warming with height accompanied by high humidity

Answer: D

Warm moist air overrunning colder air at a front produces an inversion in which the upper air is both warmer and moister, often with cloud within it. That contrasts with the dry warm air of a subsidence inversion. Distinguishing the two from the humidity structure alone is a routine piece of sounding interpretation.

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