Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Friday 23 October, 00 UTC T+96 Valid: Tuesday 27 October, 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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Flooded rail tracks

New upgrades to deliver step-change improvements to flood forecasting

Floods impact billions of people worldwide. Learn about major new upgrades to the European Flood Awareness System (EFAS) and explore how the Global Flood Awareness System (GloFAS) helped communities prepare for, and recover from, this summer’s monsoon floods in Bangladesh.

13 October 2020

Schematic of the reanalysis process

Fact sheet: Reanalysis

Reanalysis data provide the most complete picture currently possible of past weather and climate. This fact sheet explains what reanalysis is and what it is used for.


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.