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The synoptic chart for any constant-pressure surface, usually containing plotted data and analyses of the distribution of, e.g., height of the surface, wind, temperature, and humidity. Constantpressure charts are most commonly known by their pressure value; for example the 1000-millibar chart. Also called ISOBARIC CHART.



Related Terms

PROGNOSTIC CHART

A chart showing, principally, the expected pressure pattern of a given synoptic chart at a specified future time. Usually, positions of fronts are also included, and the forecast values of other meteorological elements may be superimposed.

SYNOPTIC CHART

In meteorology, any chart or map on which data and analyses are presented that describe the state of the atmosphere over a large area at a given moment of time. A synoptic surface chart is an analyzed synoptic chart of surface weather observations.

RENC

Regional Electronic Navigational Chart Co-ordinating Centre supplier of official chart data

SYSTEM ELECTRONIC NAVIGATION CHART

The electronic chart data base actually accessed aboard ship for the display of electronic charts. It is developed from the ENC provided by hydrographic authorities, but is specific to the shipboard system. When corrected, it is the equivalent of a paper chart.

CURRENT CHART

A chart on which current data are graphically depicted

ELECTRONIC CHART DATA BASE

The master electronic chart data base for the electronic navigation chart held in digital form by the hydrographic authority.

CONSTANT-PRESSURE SURFACE

In meteorology, an imaginary surface along which the atmospheric pressure is everywhere equal at a given instant. Also called ISOBARIC SURFACE.

ISOBARIC

Having the same pressure

OVERPRINT

New material printed on a map or chart to show data of importance or special value in addition to that originally printed.

STATIONARY FRONT

A front which is stationary or nearly so. A front which is moving at a speed less than about 5 knots is generally considered to be stationary. In synoptic chart analysis, a stationary front is one that has not moved appreciably from its position on the last previous synoptic chart (3 or 6 hours before). Also called QUASI-STATIONARY FRONT.

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