Forecasters said Tropical Storm Dorian was gathering strength Monday while approaching islands in the eastern Caribbean Sea, and could strike Puerto Rico and its neighbors as a minimal hurricane on Tuesday.
The U.S. National Hurricane Center issued tropical storm warnings for Barbados, St. Lucia, St. Vincent and the Grenadines.
A tropical storm watch was issued for Grenada and Martinique.
As of 5 a.m. EDT Monday, the fourth tropical storm of the Atlantic hurricane season was centered about 225 miles east-southeast of Barbados and moving west at 14 mph. Maximum sustained winds are at 60 mph.
The Associated Press contributed to this article