Most popular

Bulletin nº

Haiti, the poorest country in the Western Hemisphere, is extremely vulnerable to natural disasters. Situated on the western third of the island of Hispaniola, the country regularly experiences major earthquakes, hurricanes, tropical storms, droughts and flooding events. The impact of these has been further aggravated by deforestation that has left the urban and rural areas where the poorest segment of the population live exposed to landslides following heavy rainfall. Each successive disaster takes a toll on the Haitian economy and further hinders its sustainable development.  The development of impact-based multi-hazard early warning systems is a priority for Haiti to achieve Sustainable Development Goal One (SDG-1) “Reducing poverty in all its forms everywhere.”

Bulletin nº

The advances in Numerical Weather Prediction (NWP) in the last decades have been tremendous thanks to more, and better assimilated, observations, higher computing power and progress in our understanding of dynamics and physics. 

Bulletin nº

A new edition of the International Cloud Atlas is scheduled to be released simultaneously with this Bulletin following three years of hard work. 

Bulletin nº

The present Global Framework for Climate Services (GFCS) with a vision “to enable society to better manage the risks and opportunities arising from climate variability and change, through the development and incorporation of science-based climate information and prediction into planning, policy and practice” carries forward and builds on the solid foundation laid by the Climate Information and Prediction Services (CLIPS) project.

Bulletin nº

The Montreal Protocol on Substances that Deplete the Ozone Layer, signed in 1987, has been successful in that the amount of chlorofluorocarbons is now slowly diminishing. A common misunderstanding, however, is the belief that the ozone problem has been solved and the ozone layer is back to its original state.

Bulletin nº

As atmospheric CO2 continues to increase, more and more CO2 enters the ocean, which reduces pH (pH is a measure of acidity, the lower the pH, the more acidic the liquid) in a process referred to as ocean acidification. Declines in surface ocean pH due to ocean acidification are already detectable and accelerating.

Bulletin nº

By WMO Secretariat1


The 2014 Ozone Assessment provides the latest update of the current state of the ozone layer and makes predictions on when the ozone layer will return to 1980 values. In the northern middle latitudes (35-60°N), total ozone is now about 3.5% less than it was in the period from 1964-1980. At southern middle latitudes (35-60°S), it is about 6% less. The larger depletion in...

Bulletin nº

United Arab Emirates Research Program for Rain Enhancement Science Calls for International Submissions

The world’s population is expected to increase by a further three billion by 2050 – and 90% of that growth will be in developing countries that currently rely on existing water supplies and rainfall for food and water. The projected population growth will most likely bring global water supply to a crisis point.

Throughout...

Bulletin nº

Data repositories and archives play a critical role as the source for the observational data used in the study of weather and climate. After over two centuries of recording observations on paper, observations in the last 20 years have mostly been collected digitally. Creating homogeneous, complete data sets from disparate collections is a fundamental challenge facing the climate research community.

Bulletin nº

Weather prediction has achieved immense progress, driven by research and increasingly sophisticated telecommunication, information technology and observational infrastructure. Predictive skill now extends in some cases beyond 10 days, with an increasing capability to give early warning of severe weather events many days ahead.