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Which appearance does a cloud layer have on a plotted sounding?

  • A.The two curves diverge sharply, since the cloud droplets remove water vapour from the air within the layer
  • B.The two curves lie together over the depth of the layer
  • C.The temperature curve becomes vertical, indicating an isothermal layer within which the cloud has formed
  • D.The dew point curve crosses above the temperature curve

Answer: B

Saturation requires the dew point to equal the temperature, so the two curves coincide throughout a cloud layer and its depth can be read directly. The dew point can never exceed the temperature, so a crossing indicates a data error rather than a physical condition. Cloud droplets do remove vapour but the remaining air stays saturated, which is why the curves stay together rather than diverging. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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