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Slowly strengthening Tropical Storm Gonzalo enters Caribbean, moves toward US Virgin Islands

  • Surfers ride the waves in the waters at La Pared Beach in Luquillo, Puerto Rico, Tuesday, Oct. 14, 2014. Hurricane Gonzalo moved away from the area, but churned up heavy surf across much of the Caribbean, Tuesday. Forecasters said it could pick up strength and become a major storm as it approaches Bermuda. (AP Photo/Ricardo Arduengo)

    Surfers ride the waves in the waters at La Pared Beach in Luquillo, Puerto Rico, Tuesday, Oct. 14, 2014. Hurricane Gonzalo moved away from the area, but churned up heavy surf across much of the Caribbean, Tuesday. Forecasters said it could pick up strength and become a major storm as it approaches Bermuda. (AP Photo/Ricardo Arduengo)  (The Associated Press)

  • A surfer stretches on the shore of La Pared Beach in Luquillo, Puerto Rico, Tuesday, Oct. 14, 2014. Hurricane Gonzalo moved away from the area, but churned up heavy surf across much of the Caribbean, Tuesday. Forecasters said it could pick up strength and become a major storm as it approaches Bermuda. (AP Photo/Ricardo Arduengo)

    A surfer stretches on the shore of La Pared Beach in Luquillo, Puerto Rico, Tuesday, Oct. 14, 2014. Hurricane Gonzalo moved away from the area, but churned up heavy surf across much of the Caribbean, Tuesday. Forecasters said it could pick up strength and become a major storm as it approaches Bermuda. (AP Photo/Ricardo Arduengo)  (The Associated Press)

  • A surfer carries his surfboard as he walks along La Pared Beach in Luquillo, Puerto Rico, Tuesday, Oct. 14, 2014. Hurricane Gonzalo moved away from the area, but churned up heavy surf across much of the Caribbean, Tuesday. Forecasters said it could pick up strength and become a major storm as it approaches Bermuda. (AP Photo/Ricardo Arduengo)

    A surfer carries his surfboard as he walks along La Pared Beach in Luquillo, Puerto Rico, Tuesday, Oct. 14, 2014. Hurricane Gonzalo moved away from the area, but churned up heavy surf across much of the Caribbean, Tuesday. Forecasters said it could pick up strength and become a major storm as it approaches Bermuda. (AP Photo/Ricardo Arduengo)  (The Associated Press)

Tropical Storm Gonzalo swept through the eastern Caribbean on Monday, slowly gaining strength toward potential hurricane status on track to move over the U.S. Virgin Islands and parts of Puerto Rico.

Heavy rain and strong winds buffeted Antigua, where the effects of Gonzalo were expected to be felt for several hours. The government ordered schools and businesses to close amid an island-wide power outage and opened four emergency shelters.

"It is strengthening very slowly," said Scott Stripling, a meteorologist tracking the storm from the U.S. National Hurricane Center in Miami. "It's not out of the question that we could see it become a hurricane later this evening or tonight."

As of 8 a.m. EDT (1200 GMT), the center of Gonzalo was about 20 miles (35 kilometers) east of Antigua and 50 miles (75 kilometers) north of Guadeloupe. It had maximum sustained winds of 60 mph (95 kph) and was moving toward the west at 10 mph (17 kph).

Gonzalo is expected to produce up to 8 inches (20. centimeters) of rain across the Leeward Islands, the U.S. and British Virgin Islands and Puerto Rico.

Stripling said the latest forecast puts it on track to take a northwesterly turn, passing over the Virgin Islands and the Puerto Rican islands of Vieques and Culebra.

Over the weekend, Tropical Storm Fay knocked out power to thousands in Bermuda before moving out over open ocean.