From The National Hurricane Center, 11 am advisory on Sept 11, 2018
A Hurricane Watch is in effect for Guadeloupe, Martinique and Dominica. A Tropical Storm Watch is in effect for Antigua and Montserrat. Hurricane conditions are possible within the hurricane watch area by Thursday morning, with tropical storm conditions possible early Thursday in both the hurricane and tropical storm watch areas.
Tropical Storm Isaac is centered at 11 a.m. AST over the tropical Atlantic Ocean about 775 miles (1250 km) east of the Lesser Antilles. On the forecast track Isaac is anticipated to move near or over the central Lesser Antilles on Thursday and move into the eastern Caribbean Sea Thursday night.
Maximum sustained winds remain near 70 mph (110 km/h) with higher gusts. Isaac is expected to be near hurricane strength when it moves through the central Lesser Antilles, with some weakening forecast afterward on Friday.
Isaac is expected to produce total rainfall accumulations of 3 to 5 inches with isolated amounts near 10 inches across the southern Leeward Islands late this week, with 1 to 2 inches anticipated across portions of the Windward Islands. A storm surge of 2 to 4 feet above normal tide levels is possible near and to the north of where the center moves through the Lesser Antilles. Near the coast, the surge will be accompanied by large and destructive waves.
The next complete advisory will be issued by NHC at 5 p.m. AST – www.hurricanes.gov