And the National Hurricane Center has flagged a large zone in the Atlantic for potential tropical activity. New zone in the Atlantic tagged for potential tropical developmentLate Wednesday, the National Hurricane Center tagged a large area in the Central Tropical Atlantic for potential development. A tropical wave is expected to move off the coast of Africa over the next day or two, the NHC said. It's expected to then interact with another disturbance in the Eastern Tropical Atlantic, where some slow development is possible. This is because of more cold fronts and high pressure systems over the eastern U.S. and Northeast, that change the steering flow for tropical systems drastically from September to October.