 Early on August 28, banding increased within its organizing convection, and the system developed into Tropical Depression Eleven-E.

Due to low amounts of vertical shear, very warm waters, and abundant moisture, steady intensification was forecast, and the depression strengthened to Tropical Storm John later on August 28.Deep convection continued to develop over the storm, while an eye feature developed within the expanding central dense overcast.The storm continued to intensify, and John attained hurricane status on August 29 while 190 miles (305 km) south-southeast of Acapulco.