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Belgocontrol General Aviation meteo service Why are there Meteorological Codes? (from http://www.nws.noaa.gov/tg/code.html) The efficient and timely movement of meteorological information is a fundamental requirement of modern meteorology. Observers record information about the environment and provide it to data processing centers so that forecast guidance products may be produced. Countries exchange information to enhance their forecasts and to produce global forecast models. The facility to move information quickly between centers, without regard to language, and in a format that may be processed by automated means is embodied in meteorological codes. What are Meteorological Codes? WMO Meteorological codes are defined by the World Meteorological Organization in WMO Manual No. 306. The codes are composed of a set of values defined in tables with reference to specific position within strings of information. These defined values make up a code form and binary codes are made up of groups of letters representing meteorological or other geophysical elements. Different code forms are used to represent different types of observations or products. In messages, these groups of letters are transcribed into figures indicating the value of state of the elements described. The National Weather Service and other U.S. governmental agencies have developed additional codes and idenfication structures as supplements to the WMO codes and message identification systems. These are documented and made available through publications by the OFCM and other agencies as well as by the NWS.
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