Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Sunday 18 August, 00 UTC T+96 Valid: Thursday 22 August, 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.

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The WMO Integrated Global Observing System (WIGOS), card size

Why we need to protect weather prediction from radio frequency interference

Stephen English explains why, in a world hungry for the use of radio frequencies in new applications, the meteorological community needs to be clear about their critical value for weather prediction.

15 August 2019


News highlights January to July 2019

News highlights January to July 2019

ECMWF news highlights in the first seven months of 2019 include an upgrade of ECMWF’s Integrated Forecasting System that greatly improved forecasts; a series of events to drive forward numerical weather prediction; an assessment of ground-breaking new wind data; and the appointment of a new Director of Copernicus Services.

29 July 2019

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In focus

Articles presenting ECMWF’s involvement in diverse areas, from our graduate training programme and support for national and international initiatives to information on publications such as our User Guide.

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.

CAMS aerosol forecast for 00 UTC 14 July 2019

Highlighted tweet

The global forecasting system of the Copernicus Atmosphere Monitoring Service @CopernicusECMWF @CopernicusEU was successfully upgraded on 9 July. Find out how the changes improve #airquality forecasts:


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.

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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.