Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Monday 10 December, 00 UTC T+96 Valid: Friday 14 December, 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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Science blog MOOC atmospheric composition

Monitoring Atmospheric Composition - a Massive Open Online Course (MOOC)

The Copernicus Atmosphere Monitoring Service (CAMS) and EUMETSAT have teamed up to produce a Massive Open Online Course (MOOC) – Mark Parrington discusses its production and launch.

21 November 2018


ECMWF’s ERA5 reanalysis soon to extend back to 1979

ECMWF’s new atmospheric reanalysis, ERA5, will soon provide a detailed global picture of meteorological conditions back to 1979. ECMWF scientist Hans Hersbach has overseen the planning and production of this innovative dataset.

3 December 2018

Council lecture on atmospheric composition in the IFS

On the occasion of the 93rd Council meeting, ECMWF’s Richard Engelen and Rossana Dragani will deliver a lecture on 4 December 2018 entitled ‘Atmospheric composition in the ECMWF Integrated Forecasting System (IFS)’. The lecture will be live-streamed from 17:15 GMT.

30 November 2018

Global grid

ECMWF and the Group on Earth Observations (GEO)

ECMWF is one of 127 participating organisations which, together with 105 member nations and the European Union, form the Group on Earth Observations (GEO). Here we look at GEO’s important work and how ECMWF both benefits and contributes.

16 November 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.

2m temeprature errors twitter image

Tweet of the week

An official ECMWF target is to reduce the frequency of errors >5°C in ensemble 2m temperature forecasts for 5 days ahead. Related verification charts like this are monitored daily. Squares/triangles show errors >5°C. Warm biases over Scandinavia are under investigation.


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.