isentropic chart

isentropic chart

[¦īs·ən¦träp·ik ′chärt]
(meteorology)
A constant-entropy chart; a synoptic chart presenting the distribution of meteorological elements in the atmosphere on a surface of constant potential temperature (equivalent to an isentropic surface); it usually contains the plotted data and analysis of such elements as pressure (or height), wind, temperature, and moisture at that surface.