High resolution mean sea level pressure and ensemble spread

Saturday 21 October, 00 UTC T+96 Valid: Wednesday 25 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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SCIENCE BLOG: ERA5: the new reanalysis of weather and climate data

Within the Copernicus Climate Change Service (C3S), ECMWF is producing a detailed record of the evolution of the global atmosphere from 1950 onwards, using a method called reanalysis.

4 October 2017

Autumn 2017 Newsletter published

The autumn 2017 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 October 2017

Experts debate progress in limited-area modelling

Over 90 scientists from European national meteorological services and ECMWF came together at the Centre from 2 to 5 October 2017 to talk about convection and other topics in limited-area modelling.

17 October 2017

Flooded road in Peru

Sharing forecasts and knowledge in emergency situations

To mark the International Day for Disaster Reduction, we look at how ECMWF collaborates with the WMO to help reduce people’s exposure to weather-related disasters.

13 October 2017

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 Oct 2017

Plot of the week

Sometimes winds can be just as strong when a hurricane re-intensifies as an extratropical storm. With #Ophelia land areas missed the worst.


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.