Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Wednesday 18 July, 00 UTC T+96 Valid: Sunday 22 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

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.

MWHS2 data distributed by EUMETSAT early delivery system (EARS) for Twitter

Plot of the week

Timely MWHS2 data distributed by @EUMETSAT early delivery system (EARS) enables increased use of these observations by ECMWF's operational forecasting system. Improved timeliness of satellite observations has great potential to improve weather 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.