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- World Weather Watch (WWW) The world-wide, coordinated, developing system of meteorological facilities and services provided by WMO Members for the purpose of ensuring that all Members obtain the meteorological information required both for operational work and for research. The essential elements of the WWW are: the Global Observing System, the Global Data-processing System, and the Global Telecommunication System.
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- Atmospheric phenomenon, Error, Global Observing System, Global Telecommunication System, observation, Observational network, stable state, Surface observation, Upper air observation