(RNN) - Tropical Storm Don continues swiftly westward and is expected to reach the Lesser Antilles by Tuesday night.
Forecasters with the National Hurricane Center say the storm will dissipate by the end of the week, and currently poses no threat to the U.S. mainland.
As of a 5 a.m. advisory, Don was located about 250 miles east-southeast of Barbados and about 375 miles east of Grenada.
The tropical storm is moving west at 18 mph with maximum sustained winds of 50 mph.
A Tropical Storm Warning continues for Grenada, St. Vincent and the Grenadines, while Barbados, St. Lucia and Bonaire are under a Tropical Storm Watch.
Forecasters say the storm will cause strong wind and potentially life-threatening flooding in the warned areas.
The storm is predicted to strengthen over the next day. Within 36 hours, it will run into shear in the southeastern Caribbean, which will degrade the storm into a tropical wave by the the end of the week, the National Hurricane Center said.
Don became the fourth named storm of the Atlantic hurricane season on Monday afternoon.
Meanwhile, in the eastern Pacific about 1,495 miles from Hilo, Hawaii, Hurricane Fernandina poses no threat to land as it continues to weaken.
Tropical Storm Greg is moving away from the Pacific coast of southern Mexico and also will pose no threat to land before dissipating.
The only storm to affect the U.S. mainland so far is Tropical Storm Cindy, which made landfall on June 21 in western Louisiana.
Its winds claimed the life of a 10-year-old boy vacationing in Fort Morgan, AL, when a large log in the surf of the Gulf of Mexico slammed onto his head.
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