Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Saturday 23 March, 00 UTC T+96 Valid: Wednesday 27 March, 00 UTC

Ensemble forecasts explained
One 'ensemble forecast' consists of 51 separate forecasts made by the same computer model, all activated from the same starting time. The starting conditions for each member of the ensemble are slightly different, and physical parameter values used also differ slightly. The differences between these ensemble members tend to grow as the forecasts progress, that is as the forecast lead time increases.

View all charts

DACCIWA KITcube atmospheric observation system

The air that West Africa breathes

Angela Benedetti (ECMWF) and Peter Knippertz (KIT) explain how the EU-funded DACCIWA project collected new data in West Africa to investigate the causes and effects of air pollution, examining for the first time the entire chain of natural and human-made emissions.

12 March 2019


World Meteorological Day 2019 image

Why weather prediction needs an Earth system approach

On the occasion of World Meteorological Day 2019, ECMWF Director of Research Andy Brown looks at how the theme of the Sun, the Earth and the Weather ties in with the Centre’s Earth system approach to numerical weather prediction.

22 March 2019

Oksana Tarasova at CHE-VERIFY General Assemblies March 2019

CO2 monitoring project working towards early prototype in 2021

An ambitious European project to build an operational global carbon dioxide monitoring and verification support capability aims to deliver an early prototype in 2021, project members meeting at ECMWF for their second General Assembly from 12 to 14 March 2019 heard.

20 March 2019

Ocean with clouds and sun

Improving ocean observations for better weather forecasts

A WMO workshop in February 2019, in which ECMWF participated, examined the requirements for ocean observations, which make a critical contribution to weather forecasts and warning systems.

18 March 2019

Forecast charts and data

We provide current forecasts, climate reanalyses and specific datasets. These are available via the web, point-to-point dissemination, data servers and broadcasting.

Highlighted tweet 1 March 2019

Highlighted tweet

The warmth experienced across Europe this week is reflected in ECMWF’s 2-metre maximum temperature Extreme Forecast Index on 27 February 2019 (left). The right-hand plot shows areas where similar temperature extremes were found globally on the same day.


Forecasts, analyses, climate re-analyses, reforecasts and multi-model data are available from our archive (MARS) or via dedicated data servers or via point-to-point dissemination.

Accessing forecasts

Researchers, WMO members, commercial users and satellite data providers can gain access to ECMWF forecast products under one of our various license agreement types.

Advancing weather science

Education is a key element of our work at ECMWF, enabling our partners to get the most from ECMWF's services and develop an advanced understanding of forecasting.

ECMWF lecture theatre

ECMWF workshops are open to the worldwide meteorological community, though some training is restricted to member states.

Collaboration banner

Serving meteorology

International collaboration is fundamental to the work of ECMWF, working with the EU and the meteorological community at large, including the World Meteorological Organization, space agencies, and scientists around the world.