Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Tuesday 19 February, 12 UTC T+96 Valid: Saturday 23 February, 12 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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Annual Seminar 2019 graphic with dates

Registration open for key ECMWF events in 2019

Registration is open for several of ECMWF’s 2019 events: our Annual Seminar, the Using ECMWF’s Forecasts meeting (UEF), and workshops dedicated to strengthening links between observational campaigns and NWP and to exploring technologies for developing reproducible workflows.

8 February 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.

11 January 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.

Snowfalls plot

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Extreme snowfall affected some of southern Britain late last week. In these challenging situations ECMWF products show forecasters the likely delineations of different weather types. This case highlights the impact of warm seas in modulating precipitation type (follow the arrow).


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.