This work is based on an upwelling event registered on the western coast of the shelf (off Campeche state), by a hydrographic survey that helped describe its main structural features. Our findings are complemented with numerical modeling, using climatological Lagrangian Coherent Structures from a 12-year HyCOM Gulf of Mexico simulation and satellite remote sensing, to analyze the point source and time of origin of the upwelled waters. This particular discovery illustrates the importance of the coastal current advection, in transporting for more than 500 km upwelled waters to the western side of the shelf where the coastline is perpendicular to the wind direction, bringing new insights and questions about these phenomena in the Yucatan Shelf.