 World Meteorological Organization

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.^[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.

The World Meteorological Organization (WMO) is a specialized agency of the United Nations responsible for coordinating international cooperation in meteorology (weather and climate), climatology, hydrology, and related fields. It was established in 1950 and operates out of its headquarters in Geneva, Switzerland. The WMO's primary objectives include: 1. **Providing Weather and Climate Services**: The organization helps member countries improve their weather, climate, water, and environmental services by providing technical support and guidance.