<p>The changing climate has intensified the frequency, magnitude, and duration of extreme events in recent decades, including marine heatwaves and tropical cyclones. These events disrupt the biophysical stability of marine ecosystems, resulting in cascading ecological consequences that range from species redistribution and coastal beaching to mass mortality, which alters trophic interactions. The present study investigates massive jellyfish (<i>Netrostoma coerulescens</i>) beaching along the north-western Bay of Bengal at Puri coast (Odisha), subsequent to the landfall of cyclone Mocha. Using multi-platform (remote sensing and model) met-oceanic datasets, we analyse the possible reasons behind the mass aggregation and beaching in response to extreme events. Furthermore, we investigate the Lagrangian particle backtracking simulations employed to trace the potential origin and transport pathways of the stranded jellyfish. The persistence of marine heatwaves along the probable origin zone of jellyfish bloom creates thermally favourable conditions that enhance jellyfish proliferation and aggregation. Prolonged coastal upwelling off Puri enriched surface waters with nutrients, supporting jellyfish growth. Ebb tide conditions at the time of stranding further restricted their retreat to deeper waters. The horizontal advection of winds and currents during Cyclone Mocha facilitated the massive beaching of jellyfish.</p>