Reports [2023] N. Guida (2023), Multi-scale analysis of extreme rainfalls in Seychelles. Internship report [PFE IENM] carried out at DIROI (Météo-France). [2022] M. Payet (2022), Classification of automatic cyclone forecast trajectories provided in post-processing of the IFS ensemble forecast for tropical cyclones. Internship report [M1 SOAC, Toulouse] (in French) carried out at DESR/LACy. A. Cachard (2022), Study of the intra-seasonal predictability of the ITCZ migration and associated heavy associated rainfall over the northern Indian Ocean basin. Internship report [PFE IENM] (in French) carried out at DESR/LACy in the framework of the PISSARO project. [2021] R. Köth (2021), Diagnosis of the MJO in the South West Indian Ocean basin using S2S intra-seasonal forecast data with artificial intelligence techniques. Internship report [PFE IENM] (in French) carried out at DESR/LACy in the framework of the PISSARO project.