Forecasters say the fourth tropical storm of the Atlantic hurricane season has strengthened as it moves toward the Lesser Antilles. The U.S. National Hurricane Center (NHC) said Sunday that Tropical Storm Dorian could intensify to near hurricane strength over the eastern Caribbean Sea by Tuesday.

As of 8 p.m. EDT Sunday, Dorian’s center was located about 335 miles east-southeast of Barbados and was moving westward at 14 mph. Maximum sustained winds have remained near 50 mph since earlier Sunday.