sentences:  Thunderstorm activity briefly decreased, though late on November 13 the system acquired enough circulation and organized convection for it to be designated Tropical Depression Twenty-One-E while located about 460 miles (740 km) south of Manzanillo, Mexico.Operationally, the depression was not upgraded until eleven hours later.Initially, the tropical depression tracked to the northwest, and was forecast to peak as a 50 mph (80 km/h) tropical storm while continuing on a northwest motion.