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Which consequence follows from thickness depending on mean temperature?

  • A.A thickness chart is effectively a temperature chart
  • B.A thickness chart shows the wind at the mid-point of the layer for which it has been drawn on the map
  • C.Thickness gives the surface pressure
  • D.Thickness indicates the amount of water vapour present within the layer between the two pressure surfaces

Answer: A

Because the only variable in the hypsometric relation for a fixed pair of pressure levels is the layer mean temperature, contours of thickness are contours of mean temperature. This is why thickness charts are used for air mass identification and for forecasting precipitation type. Humidity enters only weakly through virtual temperature. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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