According to the NHC, the most likely Atlantic disturbance has a 40 percent chance of development over the next seven days. Read More on NewsTwo Atlantic Systems Under Watch... The NHC's Atlantic Tropical Weather Outlook says that a broad area of showers and thunderstorms associated with a tropical wave is currently situated several hundred miles southwest of the Cape Verde Islands off Africa's west coast. Forecasters are also tracking another tropical wave expected to move off Africa's west coast early this week. The most significant is a tropical wave located more than 1,000 miles east-southeast of Hawaii that is producing a large area of disorganized showers and thunderstorms.