Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Saturday 25 May, 12 UTC T+96 Valid: Wednesday 29 May, 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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OpenIFS Rasberry PiPS blog card

Weather forecasts with OpenIFS on a home-made supercomputer

PhD student Sam Hatfield discusses how he and colleagues built a table-top supercomputer and used it to produce demonstration weather forecasts with OpenIFS. It's a system that is proving fascinating to the public as well as benefiting Sam's research.

3 May 2019


Extra observations used in data assimilation

ECMWF holds webinars on June upgrade of its forecasting system

ECMWF upgrades its forecasting system on a regular basis, and one such upgrade is planned for 11 June 2019. Director of Forecasts Florian Pappenberger explained how the changes will improve forecasts in two webinars on 15 and 16 May 2019.

17 May 2019

Still from reconstruction of Ulysses storm over the UK in February 1903; credit: Philip Brohan

The role of ECMWF and the C3S in historical data rescue

The Copernicus Climate Change Service (C3S) activity to coordinate data rescue is an exciting and major step forward in improving the historical datasets that are so vital for assessing and managing the risks from climate change.

26 April 2019

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.

EUMETSAT Fellows at ECMWF April 2019

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EUMETSAT Research Fellows hosted at ECMWF help to improve the use of satellite data in weather forecasting. @eumetsat @NWP_SAF @WMO


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.