As of 2:00 am EDT Thu Aug 3 2017 ... A large area of showers and thunderstorms near the west coast of Africa is associated with a tropical wave. Environmental conditions are forecast to be conducive for gradual development, and a tropical depression could form by early next week over the tropical Atlantic Ocean. This system is forecast to move toward the west or west- northwest at 10 to 15 mph for the next several days. * Formation chance through 48 hours...low...20 percent. * Formation chance through 5 days...medium...50 percent.