Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Monday 17 June, 00 UTC T+96 Valid: Friday 21 June, 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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The Oak Ridge Leadership Computing Facility User Workshop 2019

The Oak Ridge Leadership Computing Facility in the US is home to “Summit”, the world’s fastest computer. After his recent trip there, Nils Wedi discusses some of the latest advances in supercomputing and considers their application to numerical weather prediction.

10 June 2019

Extra observations used in data assimilation

Forecasting system upgrade set to improve global weather forecasts

ECMWF is implementing a substantial upgrade of its Integrated Forecasting System today, 11 June 2019, which will significantly improve global medium-range weather forecasts. One of the key novelties in IFS Cycle 46r1 is that it makes data assimilation more continuous.

11 June 2019

Locations of observations assimilated between 0901 UTC 4 June and 0900 UTC 5 June 1944, superimposed on the surface pressure analysis (contour interval 3 hPa) for 1200 UTC 4 June

D-Day analyses

This article 'Revisiting the meteorology of the D-Day period, using a modern analysis and forecasting system' was first posted on 6 June 2014, to mark the 70th anniversary of the D-Day landings.

6 June 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.

European red skies on 3 June 2019 were caused by the transport of smoke from Alberta wildfires in the polar jet

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European #redskies on the morning of 3 June were caused by the transport of smoke from Alberta wildfires in the polar jet.



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.

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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.