Ten-foot waves crashed on shore in Jamaica and hundreds of islanders fled flooded homes yesterday as Hurricane Dennis lashed Caribbean coastlines with 130-mph winds. The first hurricane of the season claimed four casualties in Haiti.

Dennis threatened to intensify as it headed straight for Cuba. Forecasters at the U.S. Hurricane Center in Miami predicted the storm could hit America anywhere from Florida to Louisiana by Sunday or Monday, raising fears that oil production in the Gulf of Mexico would be disrupted by the fourth storm in as many weeks.

Thunderstorms covered the Dominican Republic, southern Haiti, and northeast Jamaica. The Cayman Islands and Cuba were under hurricane warnings, including the U.S. detention camp at Guantanamo Bay holding some 520 terror suspects.

The Florida Keys were under a hurricane warning yesterday and ordered tourists to evacuate, and the southern Florida peninsula was on tropical storm watch, expecting severe conditions within 36 hours.

Rivers burst their banks in dangerously deforested Haiti, and wind gusts uprooted a palm tree and flung it into a mud hut, killing one person and injuring three in the southern town of Les Cayes town, the Red Cross said.

In Jamaica, Prime Minister Percival Patterson urged people in low-lying areas to evacuate. “Let us all work together in unity so that we will be spared the worst,” Mr. Patterson said in a national radio broadcast.

Despite his appeal, only about 1,000 people were in shelters by late afternoon, when local forecasters said the eye of the storm was passing 50 miles north of Port Antonio, on Jamaica’s northeast coast.

This is a “dangerous hurricane” that could strengthen considerably by early Friday, the hurricane center warned.

As the hurricane center warned that the eye could pass over central Cuba sometime Friday afternoon, the Cuban government began evacuating more than 2,500 tourists and workers from Cayo Largo del Sur, in the string of keys along the southeast.

The Cuban National Information Agency reported that most tourists were taken to other hotels in Havana and the Varadero beach resort in the north. Thousands of students at government boarding schools in the southeast were being sent home. Livestock was taken to higher ground.

There were no immediate plans to evacuate detainees or troops from the U.S. detention center’s Camp Delta at Guantanamo Bay, located on Cuba’s extreme southeast end about 150 yards from the ocean, General Jay Hood said.

Troops put heavy steel shutters on sea-facing cell windows as heavy surf sent splashes of salt spray higher than the razor wire fence. Officials said Camp Delta was built to withstand winds up to 90 mph.

Oil prices rose sharply Wednesday on concerns about the Caribbean weather, but closed down 55 cents yesterday, at $60.73, a barrel, as a series of terrorist blasts in London led investors to abandon riskier investments.

Dennis came right behind Tropical Storm Cindy, which made landfall late Tuesday in Louisiana and hindered oil production and refining. Yesterday, remnants of Cindy dumped heavy rain on parts of the Carolinas, prompting flash-flood and tornado watches.

Lead forecaster Martin Nelson said it was the first time the Atlantic hurricane season had four named storms this early since record-keeping began in 1851. The season runs from June 1 to November 30.

In southern Haiti, gusts whipped sheets of rain that flooded roads and homes with up to three feet of debris filled water. Tin roofs torn from homes and businesses tumbled in the wind. U.N. mission spokesman Damian Onses-Cardona said the biggest concern was that the rains would cause landslides on denuded mountains.

Last year, three catastrophic hurricanes – Frances, Ivan, and Jeanne – tore through the Caribbean with a collective ferocity not seen in years, causing hundreds of deaths and billions of dollars in damage.

Haiti took the deadliest hit of last year’s hurricane season when Jeanne, at the time a tropical storm, triggered flooding and mudslides: 1,500 people were killed, 900 missing and presumed dead, and 200,000 left homeless.

In Jamaica, where Hurricane Ivan destroyed 8,000 homes and killed 17 people last year, a power line was knocked down yesterday in eastern Morant Point and blocked the main coastal road.

“It’s Dennis the menace,” 34-year-old shopkeeper Wayne Brown said as he raced to box up sodas, canned food, and bread from his small wooden store. He struggled to nail a blue tarp on the roof of the store, which was badly damaged by Ivan.

“It’s one storm after another,” he said. “I’ve never seen anything like it in all my years.”