The study examines the predictability during the extratropical transition (ET) of tropical
cyclones using the THORPEX Interactive Grand Global Ensemble (TIGGE) a multimodel ensemble
prediction system (EPS). It is shown that TIGGE exhibits more possible development scenarios
than a single EPS. By analysing the eddy kinetic energy budget of forecast scenarios for two ET
cases extracted from an EPS the impact of the transitioning tropical cyclones on the
midlatitude flow is studied in detail.
