Beryl was moving at about 18 mph, with maximum sustained winds of 40 mph, the hurricane center said in an 11 p.m. advisory. The official forecast calls for it to be a hurricane by Sunday afternoon.
The storm is expected to cross over the Windward Islands late Sunday and into Monday morning, bringing a risk of heavy rain, hurricane force winds and dangerous storm surge and waves. Hurricane and tropical storm watches "will likely be required for portions of the Windward and southern Leeward Islands" on Saturday, the Center stated.