On 26th June 2025, following testing, advertising and consultation, ECMWF introduced a new set of experimental products from its operational sub-seasonal forecasts (a part of the classical physics-based IFS forecasting system). These products have been labelled "Quantile-based weekly guidance maps". They aim to encapsulate both the main thrust of the forecast, and uncertainty information, in a compact and easy-to-understand format. Comprehensive guidance on how the products are put together and how to interpret them is also made available.
For the charts please see here.
For the help information go here.