 The circulation and convection became further defined, and the National Hurricane Center estimates the system developed into Tropical Depression One late on July 14 about 45 miles (75 km) west-southwest of Hatteras, North Carolina.Upon becoming a tropical cyclone, the depression was moving quickly to the east-northeast, due to a deepening mid-level low south of the Canadian Maritimes.It maintained good upper-level outflow, and its track over the gulf stream allowed for steady strengthening.