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Which curve on a plotted sounding shows the moisture?

  • A.The temperature curve, from which the humidity may be inferred once the pressure at each level is known
  • B.The parcel curve
  • C.The wet bulb curve, which is plotted alongside the temperature and always lies between it and the dew point
  • D.The dew point curve

Answer: D

A sounding is plotted as two curves, the temperature and the dew point, and the separation between them at each level shows how far the air is from saturation. The parcel curve is constructed rather than observed. The wet bulb curve can be added but is not part of the standard plot, which is why the separation of the two principal curves is what the eye is trained to read. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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