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This study examines how the impact of targeted observations propagates during the extra-tropical transition (ET) of Hurricane Fabian.Signal (forecast difference between denial experiments and Control experiment) propagation can reveal the interaction between the tropical cyclone (TC) and the midlatitude jet, and the energy dispersion or propagation of the TC undergoing ET also can be found out.The crucial role of an upper-level trough is discussed.Based on this study, a favorable strategy for targeted observations of ET is proposed, and several typical problems regarding the numerical prediction of ET are discussed.