Cyclone Senyar formed due to a rare meteorological anomaly where sea surface temperatures in the Andaman Sea and northern Malacca Strait rose significantly above 29°C, providing the intense thermal energy required for rapid storm intensification. This conditions coincided with a strong active phase of the Madden-Julian Oscillation (MJO) crossing the Indian Ocean, which drastically reduced vertical wind shear and fostered deep atmospheric instability. These factors allowed a tropical depression to unexpectedly organize and strengthen into a cyclone unusually close to the equator; driven by a shift in regional steering winds, the system was forced directly into the northeastern coast of Aceh, unleashing the torrential rainfall and gale-force winds that overwhelmed local drainage basins and triggered the catastrophic flooding and landslides.