A tropical depression churning 400 miles off the coast of North Carolina on Sunday had weather watchers eyeing a potential upgrade to a tropical storm that could impact the Outer Banks as early as Sunday night, while residents along the Gulf Coast are keeping their eyes on another potential system. Tropical Depression Eight had maximum sustained winds of 35 mph and was moving westward at about 9 mph, according to a 5 p.m. National Hurricane Center update. The depression was located 355 miles southeast of Cape Hatteras.