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Which practical use has the wet bulb potential temperature?

  • A.Direct measurement by a psychrometer, which reports it without any further calculation being required at all
  • B.Assessment of stability
  • C.Determination of the cloud base height, which follows from the difference between it and the actual temperature
  • D.Air mass identification with values in a familiar range

Answer: D

Wet bulb potential temperature is conserved for both dry and saturated adiabatic motion, like equivalent potential temperature, but takes values between about 0 and 24 degrees Celsius which are much easier to interpret. British forecasting practice uses it routinely for air mass classification. A psychrometer measures the wet bulb temperature, from which the potential form must still be computed. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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