Constant-height chart

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constant-height chart

(Also called constant-level chart, fixed-level chart, isohypsic chart.) A synoptic chart for any surface of constant geometric altitude above mean sea level (a constant- height surface), usually containing plotted data and analyses of the distribution of such variables as pressure, wind, temperature, and humidity at that altitude.

A commonly analyzed constant-height chart is the surface chart (or "sea level chart"). All of the upper-air charts are considered constant-pressure charts.

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