A westward-moving tropical wave exited the coast of Africa on July 17. It tracked across the unfavorable Atlantic Ocean and Caribbean Sea without development, and after crossing Central America, it entered the eastern Pacific Ocean on July 25. The cloud pattern and convection began to become better organized on July 28, and shortly thereafter a mid-level circulation developed. It continued to organize, and subsequent to the development of a low-level circulation it formed into Tropical Depression Seven-E while located about 975 miles (1,575 km) south-southeast of Cabo San Lucas on July 29. Operationally, tropical cyclone advisories were not initiated until visible satellite images confirmed the low-level circulation twelve hours after the depression formed.