Abstract
THETAPLOT is a diagram useful for the display and analysis of atmospheric thermodynamic soundings, particularly in relation to conditionally and convectively instable summertime weather situations. The basic coordinates of THETAPLOT are the equivalent potential temperature and the negative logarithm of pressure. The body of the diagram contains families of curves of constant potential temperature, mixing ratio and temperature. From any given sounding, three curves are plotted on the diagram: 1) Theta-ed, the equivalent potential temperature of air saturated at its dew point temperature; 2) Theta-e, equivalent potential temperature; and 3) Theta-es, the saturated equivalent potential temperature. The winds are plotted along the margin of the diagram.
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