Tropical Weather Outlook NWS National Hurricane Center Miami FL 200 AM EDT Sat Sep 22 2018 For the North Atlantic...Caribbean Sea and the Gulf of Mexico: The National Hurricane Center is issuing advisories on newly formed Tropical Depression Eleven, located about 500 miles east of the Windward Islands. 1. Showers and thunderstorms have been increasing since last evening near the center of a low pressure system located about 550 miles south-southeast of the Cabo Verde Islands. Environmental conditions appear conducive for further development of this system, and a tropical depression could form during the next day or two while the low moves westward across the tropical Atlantic Ocean at about 20 mph. * Formation chance through 48 hours...medium...50 percent. * Formation chance through 5 days...medium...60 percent. 2. A broad area of low pressure located about 200 miles south of Bermuda is producing minimal shower activity. Strong upper-level winds are expected to diminish by late this weekend or early next week, possibly allowing for some slow development of this system while it moves westward and then northwestward over the southwestern Atlantic Ocean. By the middle of next week, upper-level winds are likely to strengthen again, which would limit development as the system moves closer to the southeastern coast of the United States. * Formation chance through 48 hours...low...10 percent. * Formation chance through 5 days...low...30 percent. 3. A non-tropical low pressure system is forming along a frontal boundary about 850 miles west-southwest of the Azores. Conditions are expected to be conducive for the low to acquire subtropical or tropical characteristics, and a subtropical or tropical cyclone is likely to form early next week while the low meanders over the central Atlantic Ocean. * Formation chance through 48 hours...medium...40 percent. * Formation chance through 5 days...high...70 percent. Public Advisories on Tropical Depression Eleven are issued under WMO header WTNT31 KNHC and under AWIPS header MIATCPAT1. Forecast/Advisories on Tropical Depression Eleven are issued under WMO header WTNT21 KNHC and under AWIPS header MIATCMAT1.