A tropical disturbance persisted 520 miles (835 km) south of Acapulco on July 3. It moved steadily westward and organized over warm water temperatures of 81 °F (27 °C). A circulation developed within the system, and on July 9 it organized into Tropical Depression Seven while located about 580 miles (930 km) southwest of Acapulco. The depression turned to the west-northwest, and after briefly weakening it organized more to attain tropical storm status on July 10 while located about 745 miles (1,200 km) south of the southern tip of Baja California Peninsula.