Tropical storm forms off Mexico's Pacific coast
Norbert is headed toward Baja California but is not forecast to make a direct hit on the peninsula.
The storm was located about 215 miles south of the popular resort of Zihuatanejo and was moving northwest with sustained winds of 60 mph and higher gusts.
"Additional strengthening is forecast during the next 24 hours and Norbert could become a hurricane by tomorrow," the Miami-based center said.
(Reporting by Cyntia Barrera Diaz; Editing by Doina Chiacu)