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The impact of extratropical transition on the midlatitude flow is quantified based on potential vorticity inversion. The detailed study of Typhoon Jangmi (2008) reveals the diabatically enhanced net transport of low-PV air to the tropopause as the key physical process determining the direct impact of ET. Relocation experiments and further case studies show the crucial role of the relative position of the TC and the midlatitude flow for the downstream impact of ET and the reduced predictability.

Atmosphärische Dynamik --- mittlere Breiten --- Potentielle Vorticity Inversion --- Tropischer Wirbelsturm --- midlatitudes --- Atmospheric Dynamics --- jet stream --- potential vorticity inversion --- Strahlstrom --- Tropical Cyclone