The Brief A wave in the Eastern Atlantic now has a 20% chance of development over the next week. A wave in the Eastern Atlantic now has a 20% chance of development over the next week. A wave coming off the coast of West Africa has a 40% chance of development over the next 7 days. Timeline:As we progress through mid to late week, data suggest at least the potential for a tropical depression or tropical storm with a tropical wave coming off the coast of West Africa. Image 1 of 4 ▼This could become Tropical Storm Cristobal by later next week, but there is a lot of wind shear in the tropical Atlantic.