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A satellite image shows the sunrise hitting Tropical Storm Dorian and the Caribbean Sea on Tuesday morning. The storm has triggered alerts in Puerto Rico and other areas in its path.

NOAA/NESDIS/STAR/ GOES-East

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NOAA/NESDIS/STAR/ GOES-East

A satellite image shows the sunrise hitting Tropical Storm Dorian and the Caribbean Sea on Tuesday morning. The storm has triggered alerts in Puerto Rico and other areas in its path.

NOAA/NESDIS/STAR/ GOES-East

Puerto Rico and parts of the Dominican Republic are now under a hurricane watch due to Tropical Storm Dorian, meaning those places could see dangerous conditions within 48 hours.

Dorian’s maximum sustained winds weakened to 50 mph from 60 mph overnight, according to the National Hurricane Center. As of 8 a.m. ET, the compact storm was about 15 miles west-northwest of St. Lucia, after crossing into the eastern Caribbean Sea on Tuesday morning.

“Slow strengthening is forecast during the next 48 hours,” the NHC says, “and Dorian is forecast to be near hurricane strength when it moves close to Puerto Rico and eastern Hispaniola.”

Dry air around Dorian has tamped down the storm’s growth. And the hurricane center says the system could also weaken substantially when it passes over large land masses in Puerto Rico and Hispaniola.

Questions remain over what Dorian will do after that point, with both the Bahamas and Florida warned to keep an eye on the storm. In its latest forecast Tuesday morning, the hurricane center said Dorian’s winds will likely strengthen anew in four days, topping 70 mph after passing over Puerto Rico.

The current forecast calls for Dorian to reach Florida’s southeastern coast in the early hours of Sunday morning.

Tropical Storm Dorian is forecast to hit Puerto Rico Wednesday, before arriving at Florida’s coast this weekend. The storm is bringing heavy rainfall, but it lacks the strong winds of recent fearsome hurricanes.

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Tropical Storm Dorian is forecast to hit Puerto Rico Wednesday, before arriving at Florida’s coast this weekend. The storm is bringing heavy rainfall, but it lacks the strong winds of recent fearsome hurricanes.

NOAA/NWS

Dorian passed by Barbados late Monday night, apparently without causing any severe damage or injury. The island announced an all-clear at 5 a.m. local time.

“We need to give thanks,” Prime Minister Mia Amor Mottley said at a news conference, adding “because from all reports, there is virtually no damage.”

Less than 10 incidents were reported as of Tuesday morning, Mottley said, and those cases mainly involved fallen trees. While noting that there was inclement weather, she added, “it’s the kind of inclement weather we’re accustomed to.”

Early Tuesday, St. Lucia also discontinued its tropical storm warning, although it did not lift a mandatory shutdown order.

Dorian isn’t likely to strengthen into the sort of fearsome cyclones that recently ravaged Puerto Rico and other islands, but it still poses a threat to vulnerable areas, due to heavy rains and high winds. It’s expected to drop 2-4 inches of rain in Puerto Rico, St. Croix and the Dominican Republic, with 6 inches of rain possible in isolated spots.

“Flooding and landslides are likely during this storm,” the government of Saint Lucia said around midnight Tuesday. The island announced that it was under a national shutdown to prepare for the storm.

Despite maintaining a compact, roughly circular shape, Dorian has not developed a well-defined core. It began the day Tuesday as it did Monday, with tropical-storm-force winds that extend outward for only 45 miles from the center.