Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Monday 23 April, 00 UTC T+96 Valid: Friday 27 April, 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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The 2018 ECMWF HPC workshop – making progress on scalability

The issue of scalability will feature as the headline topic at this year's ECMWF high-performance computing (HPC) workshop in September. Here Peter Bauer, head of ECMWF’s Scalability Programme, talks about what is perhaps the biggest revolution in numerical weather prediction since computer-based forecasts began.

17 April 2018

Spring 2018 Newsletter published

The spring 2018 issue of the ECMWF Newsletter is now available. As well as news about ECMWF staff and events, it features articles about new developments and the use that can be made of ECMWF products.

20 April 2018

ECMWF makes its mark at EGU General Assembly 2018

ECMWF scientists delivered several well-received talks and courses at the European Geosciences Union (EGU) General Assembly from 8 to 13 April in Vienna, where numerical weather prediction (NWP) was generally strongly represented.

17 April 2018

ECMWF high-performance computing facility, card

Taking ECMWF computing capability forward

Since its creation, the Centre has owed its leading position to a combination of collaborative principles, top-level scientists and powerful HPC capacities. The opportunity has now arisen for a new Director of Computing to lead ECMWF’s computing efforts.

3 April 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.

Plot of the week 20 Apr 18

Plot of the week

ECMWF's extended-range forecast showed a clear signal of warm anomalies 8 to 14 days ahead of the unusually warm weather we've been seeing over Europe this week.


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.