It is "the UN System's authoritative voice on the state and behavior of the Earth's atmosphere, its interaction with the oceans, the climate it produces and the resulting distribution of water resources."
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This year, the theme of the daylong observance is "Weather-Ready, Climate-Smart." Last year, World Meteorological Day highlighted the "enormous importance of clouds for weather climate and water" and celebrated the inherent beauty and aesthetic appeal of clouds. It continues where 2017 left-off - "with extreme weather which has claimed lives and destroyed livelihoods." Through the theme, WMO underscores the importance of being weather-ready. An early warning is an important factor in disaster risk reduction; and multi-hazard early warnings enable those concerned to simultaneously address flooding, storms, and other major hazards, long before such hazards arise.Being weather-ready requires involving people and the communities at risk and the provision of impact-based early warning. It is preparing those at risk as well as those who may be involved in providing assistance. WMO has launched an initiative to establish a global and standardized multi-hazard alert system in collaboration with National Meteorological and Hydrological Services worldwide.