Active Systems: The National Hurricane Center is issuing advisories on Tropical Storm Fiona, located a few hundred miles east-southeast of the Leeward Islands. 1. Central Atlantic: A tropical wave located roughly midway between the west coast of Africa and the Lesser Antilles is producing limited and disorganized shower activity. Some slow development of this system is possible late this weekend and early next week while it moves northwestward to northward over the central subtropical Atlantic. * Formation chance through 48 hours...low...near 0 percent. * Formation chance through 5 days...low...20 percent.