Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Tuesday 18 September, 12 UTC T+96 Valid: Saturday 22 September, 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's Summer of Weather Code

As ECMWF's first Summer of Weather Code (ESoWC) comes to an end, Julia Wagemann describes how this online collaborative programme is helping ECMWF develop new and innovative software.

10 September 2018


Annual Seminar focuses on assimilating Earth observations into models

ECMWF’s Annual Seminar on ‘Earth system assimilation’ opened on 10 September. One of the speakers at the four-day event, ECMWF scientist Dinand Schepers, trained as an aerospace engineer before moving into Earth observations and their assimilation into Earth system models.

10 September 2018

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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.

20 August 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.

Twitter image Hurricane Florence

Plot of the week

ECMWF simulated satellite image of Hurricane #Florence at 12 UTC Sunday 9 September 2018. Dropsondes launched from US hurricane reconnaissance aircraft to measure the storm's properties were used in ECMWF’s forecasting system; these are shown as blue triangles.


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.