Tropical Storm Earl became the fifth named storm of the Atlantic hurricane season on Friday.
The storm is about 75 miles north of St. Thomas, with maximum sustained winds of 50 mph, according to the National Hurricane Center's 5 a.m. ET advisory on Sunday.
The storm is forecast to move west-northwest, producing rainfall totals of two to four inches across the Leeward Islands, U.S. and British Virgin Islands, and Puerto Rico on Sunday, with isolated amounts up to six inches possible.
The center of Earl is expected to pass to the north of the Virgin Islands and Puerto Rico on Sunday, and then move away from the islands Sunday night and Monday.
Gusty squalls with embedded heavy rain could lead to limited flash flooding, particularly in urban locations and small streams for the areas affected, according to the hurricane center. There were no watches or warnings in effect as of 5 a.m. ET Sunday morning.
The CNN Wire contributed to this report.