Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Saturday 17 February, 12 UTC T+96 Valid: Wednesday 21 February, 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.

View all charts

Earth surface processes, human impact and predictability

Gianpaolo Balsamo discusses the importance of two-way coupling between the atmosphere and Earth’s surface, and how humans are altering these interactions. He shares his drive and excitement about bringing recent research developments into operational use.

2 February 2018


Paving the way for ocean–atmosphere coupled data assimilation

Phil Browne trained as an applied mathematician before joining ECMWF to help develop a key aspect of operational numerical weather prediction (NWP): coupled ocean–atmosphere data assimilation. He sets out the challenges involved and how he is addressing them.

12 February 2018

ECMWF launches Summer of Weather Code programme

ECMWF is launching a programme open to anybody keen to develop innovative weather data technologies. Applications to work on any one of 13 challenges can be submitted until 30 March.

5 February 2018

NOAA Gulfstream IV (G-4) aircraft

ECMWF supports atmospheric river reconnaissance flights

ECMWF is providing support for an atmospheric river field campaign over the eastern Pacific. The campaign is led by Scripps Institution of Oceanography’s Center for Western Weather and Water Extremes and will run until late February 2018.

6 February 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.

Sudden Strastospheric Warming image for Twitter

Plot of the week

ECMWF’s analysis shows the evolution of the current sudden stratospheric warming. Such events can favour easterly winds near the surface and can result in relatively cold temperatures in Europe. #OzoneHole #SuddenStratosphericWarming



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.