From Medium to (quite) Extended range Predictions over the Northern Extratropics: some notes.

Here some recent results are presented on the prediction skill of weather and climate forecasts over the Northern Extratropics. In particular I will show i) flow dependent verification of the ECMWF medium range ensemble over the Euro-Atlantic region, ii) sensitivity of seasonal and multi-year predictions to model resolution, and iii) impact of initialisation versus external forcing in decadal predictions.