Abstract
The lapse rate of dew point is developed from thermodynamic relations. It is shown to have varied values depending on the flux of water vapor but to have a value of nearly 1.0F° per 1,000 feet for steady state. The lapse rate of temperature is developed after a method suggested by Priestley and Swinbank. Approximately 10,000 cases of ceiling heights, temperatures and dew points observed simultaneously are used as a statistical sample to represent an equilibrium state for a layer 1,000 feet or less thick. The results suggest the ratio of the equilibrium lapse rate to the dry adiabatic lapse rate is nearly 0.80.
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