Message of the United Nations Secretary General on the occasion of the World Meteorological Day 2026; March 23rd.
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On this World Meteorological Day, we are reminded that foresight saves lives. Climate chaos is rewriting the rules of weather, with record heat, longer droughts, rising seas and ever more frequent and extreme disasters. Accurate, trusted science is our first line of defence. The World Meteorological Organization and national services help keep us safe by weaving a global web of data, from land, sea, air and space – turning measurements into forecasts, and forecasts into early warnings. Yet the global observing system is under strain, with critical gaps, especially in least developed countries and small island developing States. This year’s theme, Observing Today, Protecting Tomorrow, is a call to action. Governments, development banks and the private sector must scale up support for our global observing backbone, from surface stations to satellites, and ensure data is shared openly and equitably. And we must accelerate Early Warnings for All so that, by 2027, every person is protected by life-saving alerts. Investing in observation pays many times over – strengthening peace, security, resilience and sustainable development. By observing today, we can protect tomorrow – for people, for planet, for prosperity, and for generations to come.
The Earth’s climate is more out of balance than at any time in observed history, as greenhouse gas concentrations drive continued warming of the atmosphere and ocean and melting of ice, according to the World Meteorological Organization (WMO) . These rapid and large-scale changes have occurred within a few decades but will have harmful repercussions for hundreds – and potentially thousands – of years. State of the Global Climate 2025 The global climate system is complex. In order to unpack such complexity, the WMO State of the Global Climate 2025 uses Climate Indicators to describe the changing climate. The following site aims to provide an overview of the annually produced State of the Climate report . Please note that for some indicators, 2025 data is not yet available. The latest available data is provided where this is the case. Greenhouse Gases Increasing levels of greenhouse gases, like carbon dioxide, in the atmosphere due to human activities are a major driver of...
A mushroom-shaped cloud bloomed over downtown Seoul. It gradually covered the city and then poured down rain, making it feel like a scene out of a movie. Photographer: Gyu Ho Shin Location: Gwangju City, Gyeonggi Province, South Korea Selected as a shortlist of 75 finalists for our annual Photo Competition for the WMO 2026 Calendar. Vote for your favourites by simply liking them. To see all finalists or to vote on Facebook, click the link in our bio!
Cloud is an important factor affecting climate change , playing a crucial role in controlling the Earth’s energy and water cycle. In this study, total cloud cover (TCC) from the fifth-generation atmospheric reanalysis of the European Centre for Medium-Range Weather Forecasts (ERA5) and the International Satellite Cloud Climate Project H-series (ISCCP) were compared with those from the Advanced Geosynchronous Radiation Imager (AGRI) aboard Fengyun4A (FY4A) and ground observations (OBS), revealing the spatiotemporal distribution characteristics of TCC in Xinjiang Uygur Autonomous Region (Xinjiang), northwest China. The findings indicate that the interannual fluctuations in the annual mean TCC from OBS in Xinjiang exhibit no discernible trend, while those based on ERA5 and ISCCP demonstrate a decline. The TCC from FY4A and ISCCP shows a distribution pattern of high in the south and low in the north, whereas the opposite is true for that from OBS and ERA5. For all ground observation statio...
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