Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Friday 19 July, 00 UTC T+96 Valid: Tuesday 23 July, 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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ECMWF science blog; simulated satellite image

Science blog

Our science blog posts give a scientist’s perspective on different areas of ECMWF’s work, with topics ranging from high-performance computing, single precision computer calculations, satellite data assimilation and reanalysis to the prediction of flood and fire risk.


ECMWF Newsletter 160 cover

Summer 2019 Newsletter published

The summer 2019 issue of the ECMWF Newsletter is now available. As well as news about ECMWF staff and events, it features articles about new developments and the use that can be made of ECMWF products.

19 July 2019

UEF 2019 Speakers' Corner

ECMWF user meeting puts emphasis on creativity and interaction

Creative and interactive sessions took pride of place in this year’s Using ECMWF’s Forecasts meeting, which took place at the Centre from 3 to 6 June. The meetings give ECMWF data users an opportunity to learn about the Centre’s plans, new products and services.

15 July 2019

Newsletter cover images montage

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.

European red skies on 3 June 2019 were caused by the transport of smoke from Alberta wildfires in the polar jet

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European #redskies on the morning of 3 June were caused by the transport of smoke from Alberta wildfires in the polar jet.



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.