Constant-pressure charts

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constant-pressure chart

(Also called isobaric chart, isobaric contour chart.) The synoptic chart for any constant-pressure surface, usually containing plotted data and analyses of the distribution of, for example, height of the surface, wind, temperature, and humidity.

Constant-pressure charts are most commonly known by their pressure value; for example, the 1000-mb chart (which closely corresponds to the surface chart), the 850-mb chart, 700-mb chart, 500-mb chart, etc.
Compare constant-height chart;
see mandatory level.