Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Saturday 08 August, 12 UTC T+96 Valid: Wednesday 12 August, 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 science blog; simulated satellite image

Science blog

Read our science blog for a scientist’s perspective on different areas of ECMWF’s work. Recent posts cover experiments on the world’s fastest computer, a new snow model, participation in observational campaigns, and ECMWF’s first Science and Art exhibition.

27 July 2020


News highlights image Jan-Jul 2020

News highlights January to July 2020

ECMWF news highlights in the first seven months of 2020 include an upgrade of ECMWF’s Integrated Forecasting System; a new supercomputer contract; projects and workshops to drive forward weather science; and new insights from the EU-funded Copernicus services implemented by ECMWF.

27 July 2020

ECMWF Fellows Tilmann Gneiting, Rupert Klein, Tim Palmer

Fellowship terms end for ECMWF’s first three Fellows

Prof. Tilmann Gneiting, Prof. Rupert Klein and Prof. Tim Palmer were appointed in July 2014. Their expertise and engagement have brought major benefits in areas including forecast calibration, numerical methods, and the use of reduced numerical precision within weather forecast simulations.

20 July 2020

Composite image of Earth as seen by Metop-B satellite

In focus

Articles presenting ECMWF’s involvement in diverse areas and fact sheets on topics including Earth system data assimilation, reanalysis, and ECMWF's use of satellite observations.

3 August 2020

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.

2019 Annual Report - Cover Page

Highlighted tweet

The ECMWF Annual Report 2019 is now available online, reviewing improvements in forecast performance, advances in research, the Centre’s contributions to Europe’s Copernicus Earth observation programme, and preparations for the new data centre in Italy.


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.

Collaboration banner

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.