Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Friday 21 September, 12 UTC T+96 Valid: Tuesday 25 September, 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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ECMWF's Summer of Weather Code

As ECMWF's first Summer of Weather Code (ESoWC) comes to an end, Julia Wagemann describes how this online collaborative programme is helping ECMWF develop new and innovative software.

10 September 2018


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Diverse project work in focus

Articles in this section present ECMWF’s involvement in diverse areas, including work to monitor the composition of our atmosphere and human CO2 emissions, initiatives to reduce exposure to weather-related disasters, and research into improving energy-efficiency in NWP models.

20 August 2018

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.

Storm Ali for Twitter

Plot of the week

The 1-day Extreme Forecast Index (EFI) forecast showed anomalously high wind gusts for parts of Europe from #stormAli. In the south red areas are focused over land; computations can now identify when conditions will be highly unusual over land but less unusual over the sea.


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.