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.
References in periodicals archive ?
While their job is often thought of as pouring over upper-level charts and sketching over isentropic charts, the questions they are actually asking themselves are variations of all the material above: "Where are things destabilizing?" "Where is the relative humidity increasing, and what might be contributing to it?" "Where is vertical motion developing?" All of these contribute to deteriorating ceilings, visibility, and precipitation.