What is a weather chart?

Weather charts are the fundamental basis for weather analysis and forecasts. They are based on the data collected by weather stations on the ground and on the data recorded at high altitudes by probes and satellites. Most modern instruments are able to guarantee a continuous recording of atmospheric data, but the weather charts are created using the data recorded at preset conventional timings, so that they may be comparable with one another in different locations around the world. The timings set by the World Meteorological Organization are called synoptic hours and are at 00:00-06:00-12:00-18:00 hrs.
The related charts are known as synoptic weather charts. All the world stations are connected by networks managed by the World Meteorological Organization and for Europe, by The International Network of European Meteorological Services and the charts are created using standard criteria and symbols, so that they can be compared with each other. A weather chart includes an isobar chart and the representation, with opportune symbols, of the principal atmospheric parameters, such as wind direction and speed, types of clouds and extension of the cloud formations, the position of warm, cold and occluded fronts and the high and low pressure centres.
Weather charts can describe the weather conditions on ground, or at high altitudes, and are the basis for the creation of weather forecast maps.

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