Hurricane Irma roared into the Caribbean with record-setting force early Wednesday, shaking people in their homes on the islands of Antigua and Barbuda on a path toward Puerto Rico and possibly Florida by the weekend.

Irma, which was the strongest Atlantic hurricane ever recorded north of the Caribbean and east of the Gulf of Mexico, passed almost directly over the island of Barbuda, according to the U.S. National Hurricane Center in Miami.

Authorities in the small islands of the eastern Caribbean were still evaluating the situation as the sun rose though there were widespread reports of flooding and downed trees. Antiguan police were waiting until the winds dropped before sending helicopters to check on damage reports of damage in Barbuda. There were no immediate reports of casualties.

鈥淲e are glad so far for the good news that we have had so far,鈥� Donald McPhail, executive director of the Eastern Caribbean Civil Aviation Authority, said early Wednesday as he heard from employees around the region after hunkering down for the night at home in Antigua.

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The island of Anguilla was experiencing 鈥渆xtremely heavy winds and rain,鈥� according to the Disaster Management Department and there were reports of flooding, but details were not yet available.

The centre of the storm was about 15 miles (25 kilometres) west of St. Martin and Anguilla about 8 a.m. Wednesday, the hurricane centre said. It was heading west-northwest at 16 mph (26 km/h).

The International Space Station鈥檚 external cameras captured a dramatic view of Hurricane Irma as it moved across the Atlantic Ocean Sept. 5.

鈥� Intl. Space Station (@Space_Station)

As the eye of Hurricane Irma passed over Barbuda around 2 a.m., phone lines went down under heavy rain and howling winds that sent debris flying as people huddled in their homes or government shelters.

In Barbuda, the storm ripped the roof off the island鈥檚 police station, forcing officers to seek refuge in the fire station and at the community centre that served as an official shelter. The Category 5 storm also knocked out communication between islands. Midcie Francis of the National Office of Disaster Services confirmed there was damage to several homes, but said it was too early to assess the extent of damage.

The storm had maximum sustained winds of 185 mph (295 kph), according to the Hurricane Center. It said winds would likely fluctuate slightly, but the storm would remain at Category 4 or 5 strength for the next day or two. The most dangerous winds, usually nearest to the eye, were forecast to pass near the northern Virgin Islands and near or just north of Puerto Rico on Wednesday.

President Donald Trump declared emergencies in Florida, Puerto Rico and the U.S. Virgin Islands, and authorities in the Bahamas said they would evacuate six southern islands.

Warm water is fuel for hurricanes and Irma was moving over water that was 1.8 degrees (1 degree Celsius) warmer than normal. The 79 degree (26 Celsius) water that hurricanes need went about 250 feet (80 metres) deep, said Jeff Masters, meteorology director of the private forecasting service Weather Underground.

Four other storms have had winds as strong in the overall Atlantic region, but they were in the Caribbean Sea or the Gulf of Mexico, which usually have warmer waters. Hurricane Allen hit 190 mph in 1980, while 2005鈥檚 Wilma, 1988鈥檚 Gilbert and a 1935 great Florida Keys storm all had 185 mph winds.

The northern Leeward Islands were expected to see normal tide levels rise by as much as 11 feet (3.3 metres), while the Turks and Caicos Islands and southeastern Bahamas could see surge of 20 feet (6 metres) and higher waves later in the week, forecasters said.

Bahamas Prime Minister Hubert Minnis said his government was evacuating six islands in the south because authorities would not be able to help anyone caught in the 鈥減otentially catastrophic鈥� wind, flooding and storm surge. People there would be flown to Nassau in what he called the largest storm evacuation in the country鈥檚 history.

鈥淭he price you may pay for not evacuating is your life or serious physical harm,鈥� Minnis said.

The U.S. National Weather Service said Puerto Rico had not seen a hurricane of Irma鈥檚 magnitude since Hurricane San Felipe in 1928, which killed a total of 2,748 people in Guadeloupe, Puerto Rico and Florida.

鈥淭he dangerousness of this event is like nothing we鈥檝e ever seen,鈥� Puerto Rico Gov. Ricardo Rossello said. 鈥淎 lot of infrastructure won鈥檛 be able to withstand this kind of force.鈥�

The eye of the storm was expected to rip westward on a path taking it a little north of Puerto Rico, the Dominican Republic, Haiti and Cuba.

The northern parts of the Dominican Republic and Haiti could see 10 inches (25 centimetres) of rain, with as much as 20 inches (50 centimetres) in the southeast Bahamas and Turks and Caicos.

The storm seemed almost certain to hit the United States by early next week.

鈥淵ou鈥檇 be hard pressed to find any model that doesn鈥檛 have some impact on Florida.鈥� said University of Miami senior hurricane researcher Brian McNoldy.

In Florida, people stocked up on drinking water and other supplies.

Florida Gov. Rick Scott activated 100 members of the Florida National Guard to be deployed across the state, and 7,000 National Guard members were to report for duty Friday when the storm could be approaching the area. On Monday, Scott declared a state of emergency in all of Florida鈥檚 67 counties.

Officials in the Florida Keys geared up to get tourists and residents out of Irma鈥檚 path, and the mayor of Miami-Dade County said people should be prepared to evacuate Miami Beach and most coastal areas.

Mayor Carlos Gimenez said the voluntary evacuations could begin as soon as Wednesday evening. He activated the emergency operation centre and urged residents to have three days鈥� worth of food and water.

The Hurricane Center in Miami said hurricane-force winds extended 50 miles (85 kilometres) from Irma鈥檚 centre and tropical storm-force winds extended 175 miles (280 kilometres).

Also Wednesday morning, a new tropical storm formed in the Gulf of Mexico off Mexico鈥檚 coast. Tropical Storm Katia had maximum sustained winds of 40 mph (65 kph) with some strengthening forecast over the next two days. But the hurricane centre said Katia was expected to stay offshore through Friday morning.

And another tropical storm farther east in the Atlantic was expected to become a hurricane by Wednesday night. Tropical Storm Jose鈥檚 maximum sustained winds had increased to near 60 mph (95 kph). The storm was centred about 1,255 miles (2,020 kilometres) east of the Lesser Antilles and was moving west near 13 mph (20 kph).

Anika Kentish, The Associated Press