Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Base Time: Mon 25 Jan 2021 00 UTC T+96 Valid time: Fri 29 Jan 2021 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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New insights into polar observing systems using numerical models

Irina Sandu and François Massonnet (Université Catholique de Louvain) discuss polar observations, their impact on forecasting, and how the development of observing systems goes hand in hand with the development of numerical prediction systems.

8 January 2021

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Call for ocean data assimilation abstracts for May event

Abstracts for an online workshop on ocean data assimilation to be held from 17 to 20 May 2021 can be submitted until 31 January. The event aims to bring together experts in the field of ocean and coupled data assimilation.

20 January 2021

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ECMWF at the AMS Annual Meeting 2021: recordings now available

Update: Recordings of some presentations given by ECMWF staff at the American Meteorological Society (AMS) 101st Annual Meeting (held virtually from 10 to 15 January 2021) are now available in this article.

20 January 2021


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How to get support from ECMWF

The ECMWF Support Portal provides a single point of entry for users to request support and find documentation.

19 January 2021

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.

IFS 47r1 upgrade image for documentation

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Full documentation is now available for Cycle 47r1 of ECMWF’s Integrated Forecasting System (IFS), which became operational in July this year. IFS documentation #IFS47r1


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.

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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.