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...
Understanding evapotranspiration (ET) variation is crucial for water management and to comprehend the direction of hydroclimatic fluctuations in a changing world. This study aimed to investigate the inter- and intra-annual variation of ET in the data-sparse Guder River watershed using the appropriate ET estimation model. We have evaluated the performance of two widely used remote sensing ETs and three temperature and radiation-based ET models and selected the best-performing data. We have used innovative trend analysis (ITA) and harmonic analysis to find the general trends and periodic variations in ET. The long-term mean ET of the Guder River watershed ranged from 701.7 to 841 mm per year. Over the past two decades, there has been a general declining trend in annual ET. The analysis of seasonal variation showed considerable fluctuations in ET, with the lowest value of 26.7 mm in winter and the highest value of 159 mm in autumn. The seasonal data analysis revealed that the declin...
At the halfway point, we are making strong progress in saving lives, protecting livelihoods, and strengthening resilience across countries and communities. Governments must lead the way Collaboration between the public and private sectors holds significant potential for the Early Warnings for All initiative, with opportunities for engagement across a broad spectrum of private sector actors—both large and small. While government agencies —particularly National Meteorological and Hydrological Services —must remain the source of authoritative warnings, private sector collaboration can help drive innovation, strengthen dissemination, and enhance risk knowledge. From AI-driven forecasting tools to enhanced communication systems , businesses can provide valuable expertise and resources. Whether they are established corporations or local companies, the private sector has a vested interest in leveraging weather and climate information to manage risks, protect assets, optimize operations, ...
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