Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Sunday 22 July, 00 UTC T+96 Valid: Thursday 26 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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New computer architectures and next-generation numerical weather forecasting

The next few years will see a more diverse range of computer architectures and vendors than we’ve enjoyed for over a decade. Simon McIntosh-Smith, a Professor of High Performance Computing from the University of Bristol who collaborates with ECMWF, explains the challenges and opportunities this will bring to the numerical weather forecasting community.

16 July 2018

Summer 2018 Newsletter published

The summer 2018 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.

20 July 2018

Rainfall percentiles derived from ecPoint-Rainfall

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.

11 June 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.

Positive EFI values for 2-metre temperature on forecast day 1 in Europe, averaged from 1 June to 18 July 2018

Plot of the week

The ECMWF Extreme Forecast Index (EFI) is used to identify anomalous weather. Unusually warm conditions in parts of Europe over the last few weeks are reflected in positive EFI values for 2-metre temperature on forecast day 1, averaged from 1 June to 18 July 2018.


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.