Advancing global NWP through international collaboration

High resolution mean sea level pressure and ensemble spread

Tuesday 22 May, 00 UTC T+96 Valid: Saturday 26 May, 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.

View all charts

NOAA satellite launch 20 years ago marked start of new era

Sunday 13 May marks the 20th anniversary of the start of a new era in meteorological satellite observations. On 13 May 1998, the NOAA-15 satellite was launched, beginning the ATOVS series of satellite observations that continues to this day.

11 May 2018

Forecast User Guide

User guide to ECMWF forecast products

A new edition of ECMWF’s user guide is now available online. The ECMWF Forecast User Guide helps forecasters and other meteorologists to make the best use of the forecast products from ECMWF.

14 May 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 - CAPE

Plot of the week

A new product of maximum predicted convective available potential energy (CAPE) over 6 hours will be available from 5 June as part of the next upgrade of ECMWF's Integrated Forecasting System (IFS). It will help in the prediction of severe convection.


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.