= World Meteorological Organization
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The <World Meteorological Organization> coordinates international cooperation on atmospheric observations and their interpretation. Shared measurement conventions allow observations made by different services to be compared: instrument exposure, averaging intervals and reporting definitions can change the meaning of otherwise similar numbers.
Its instrument guide documents methods for measuring quantities such as <pressure> at a <weather station>.<Guide to Meteorological Instruments and Methods of Observation by the World Meteorological Organization>[Part I: instrument methods and observation conventions]{ref} The <International Cloud Atlas by World Meteorological Organization> similarly provides definitions for cloud and precipitation phenomena. Such conventions support physical comparison across observing networks; they do not remove instrument uncertainty or local sampling effects.
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