Hurricane Dorian is on track to become a major hurricane with dangerous storm surge and winds before its slams into Florida's east coast at the end of Labor Day weekend, forecasters say.

Dorian left the Caribbean relatively unscathed as it pushed past Puerto Rico and the U.S. and British Virgin Islands on Wednesday. But forecasters at the National Hurricane Center say the storm is primed to strengthen to a Category 3 hurricane with possible "rapid intensification" as it swirls into the Atlantic.

"Dorian is likely to reach major hurricane strength in the next day or two and is forecast to maintain that status until it reaches land," the weather service said.

Florida Gov. Ron DeSantis declared a state of emergency for 26 counties in Dorian's possible path and said he spoke with President Donald Trump on Wednesday evening about storm preparations.

"Every Florida resident should have seven days of supplies, including food, water and medicine, and should have a plan in case of disaster," DeSantis said in a statement.

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At 5 a.m. Thursday, Dorian was spotted about 425 miles east-southeast of the southeastern Bahamas and heading northwest at 13 miles per hour. With winds up to 85 mph, Dorian was a Category 1 hurricane but forecast to reach 125 mph winds as it approaches Florida early Monday.

Threats of storm surge, powerful winds and heavy rains all loomed for Florida and the Bahamas, though the hurricane's exact path as it nears the U.S. remains uncertain.

Parts of the southeastern U.S. could be drenched in 4 to 8 inches of rainfall, with isolated patches up to a foot.

In a tweet Thursday morning, Trump described Puerto Rico as "in great shape" after the storm's fury largely avoided the island. However, he warned Floridians to prepare.

"Florida get ready! Storm is building and will be BIG!" he tweeted.

Officials in Puerto Rico and the Virgin Islands breathed a sigh of relief as they assessed minimal impacts from Dorian.

"We’re happy because there are no damages to report," said William Solís, the mayor of Culebra, a small Puerto Rican island. One community lost power, he said.

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Island-wide blackouts affected St. Thomas and St. John in the U.S. Virgin Islands, and St. Croix had scattered outages, government spokesman Richard Motta said.

"We are grateful that it wasn’t a stronger storm," Motta said. Trees and only one electric pole were downed. 

Similarly, the British Virgin Islands saw no major damage, Gov. Augustus Jaspert said.

Meanwhile, far off the mid-Atlantic coast, Post-Tropical Cyclone Erin continued to move northeast, and hit parts of Canada as a weaker tropical storm Friday, forecasters said.

Contributing: Jeff Burlew, Tallahassee Democrat; The Associated Press. Follow USA TODAY's Ryan Miller on Twitter: @RyanW_Miller

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