Hurricane Irma has set another record, having sustained max wind speeds of 185 miles per hour for more than 24 hours - so becoming the only Atlantic hurricane to sustain that powerful wind speed for so long.

The last hurricane is maintain such winds for even close to that long was hurricane Allen, which hit northern Mexico and southern Texas in 1980. Allen had winds of 180 mph and above for around 18 hours. The top wind speed for Allen was 190 mph.

Irma has clobbered Caribbean islands with pounding winds, rain and surging surf on Wednesday as officials in Florida called for evacuations ahead of the storm's expected landfall there this weekend.

Irma could become the second powerful storm to thrash the US mainland in as many weeks, but its precise trajectory remained uncertain. Hurricane Harvey killed about 60 people and caused as much as $180 billion in damage after hitting Texas late last month.

The eye of Irma was passing over the northernmost Virgin Islands on Wednesday afternoon after crossing the half-French, half-Dutch island of St. Martin, the US National Hurricane Center said. Category 5 is its highest category.

On its current path the core of Irma, which the Miami-based centre said was the strongest Atlantic storm on record, was expected to pass near or just north of Puerto Rico on Wednesday before scraping the north coast of the Dominican Republic on Thursday.

Karel van Oosterom, the Netherlands ambassador to the United Nations, said Irma had hit the Dutch islands of Saba and Sint Eustasius before overrunning St. Martin.

“First information indicates that a lot of damage has been done, but communication is still extremely difficult,” he said at a UN meeting.

Hurricane Irma – devastation caused in pictures Show all 45 1 /45 Hurricane Irma – devastation caused in pictures Hurricane Irma – devastation caused in pictures Recently planted palm trees lie strewn across the road as Hurricane Irma passes by in Miami Beach, Fla. 10 September 2017. AP Hurricane Irma – devastation caused in pictures Damage outside the Mercure hotel in Marigot, on the Bay of Nettle, on the island of Saint-Martin AFP/Getty Images Hurricane Irma – devastation caused in pictures People pick up debris in Fajardo as Hurricane Irma howled past Puerto Rico after thrashing several smaller Caribbean islands Reuters/Alvin Baez Hurricane Irma – devastation caused in pictures Large waves produced by Hurricane Irma crash into the end of Anglins Fishing Pier in Fort Lauderdale, Florida. The category 4 hurricane made landfall in the United States in the Florida Keys at 9:10 a.m. after raking across the north coast of Cuba. 10 September 2017 Getty Images Hurricane Irma – devastation caused in pictures A Royal Air Force Puma has been delivered to the US Virgin Islands to assist with the humanitarian efforts post Hurricane Irma. The Puma will be delivering Humanitarian Aid and Disaster Relief in support of the Department for International Development. Royal Air Force logisticians from RAF Brize Norton have assisted with the delivery of military personnel and aid cargo to the Caribbean to support disaster relief in the wake of Hurricane Irma. RAF aircraft including, C-17 A400M and Voyager are supporting a Joint Task Force of RAF, Royal Marines, Army and RN personnel who are supporting the Department for International Development as it delivers aid to stricken Caribbean Islands. MoD Hurricane Irma – devastation caused in pictures Flamingos at Zoo Miami, are shown in a temporary enclosure in a hurricane resistant structure within the zoo, Saturday, 9 September 2017 in Miami. Though most animals will reman in their secure structures, the cheetahs and some birds will ride out the storm in temporary housing. AP Hurricane Irma – devastation caused in pictures Boats are seen at a marina in South Beach as Hurricane Irma arrives at south Florida, in Miami Beach, Florida, U.S. 10 September 2017 Reuters Hurricane Irma – devastation caused in pictures Storm clouds are seen over Fisher Island as Hurricane Irma approaches on 9 September 2017 in Miami Beach, Florida. Florida is in the path of the Hurricane which may come ashore at category 4 Getty Images Hurricane Irma – devastation caused in pictures Waves crash over a seawall at the mouth of the Miami River from Biscayne Bay, Fla., as Hurricane Irma passes by. 10 September 2017 AP Hurricane Irma – devastation caused in pictures Some of the damage on Saint Martin EPA/Gerben Van Es/Dutch Department of Defence Hurricane Irma – devastation caused in pictures The skyline is seen as the outerbands of Hurricane Irma start to reach Florida on 9 September 2017 in Miami, Florida. Florida is in the path of the Hurricane which may come ashore at category 4. Getty Images Hurricane Irma – devastation caused in pictures A tree toped by hurricane Irma is seen on a empty street in Remedios, Cuba, 9 September 2017. Hurricane Irma reached Cuba bringing winds between 160 and 190 kilometers per hour. The hurricane has hit the north coast of the island. EPA Hurricane Irma – devastation caused in pictures James Constantineau loads sands bags in his truck as he prepares for the approach of Hurricane Irma Saturday, 9 September 2017, in East Palatka, Fla. Gov. Rick Scott is urging anyone living in an evacuation zone in southwest Florida to leave by noon as the threat of Hurricane Irma has shifted west. AP Hurricane Irma – devastation caused in pictures The Fort Louis Marina in Marigot is seen on 8 September 2017 in Saint-Martin island, devastated by Hurricane Irma. AFP Hurricane Irma – devastation caused in pictures Destruction in Orient Bay on the island of Saint-Martin AFP/Getty Hurricane Irma – devastation caused in pictures The wreckage in Orient Bay on the island of Saint-Martin AFP/Getty Hurricane Irma – devastation caused in pictures View of the aftermath of Hurricane Irma on Saint Martin Reuters Hurricane Irma – devastation caused in pictures A mobile network tower snapped in two by the hurricane on the island of Barbuda ABS TV Hurricane Irma – devastation caused in pictures A house reduced to rubble on the island of Saint Barthelemy AFP/Getty Images Hurricane Irma – devastation caused in pictures General view of damage on Saint Martin Reuters Hurricane Irma – devastation caused in pictures A damaged Casino Royale on Saint Martin after the passage of Hurricane Irma Anna Mazur/AFP Hurricane Irma – devastation caused in pictures An aerial photograph taken and released by the Dutch department of Defense shows the damage of Hurricane Irma in Philipsburg, Sint Maarten, the Dutch section of the Caribbean Island Gerben Van Es/AFP Hurricane Irma – devastation caused in pictures Flooded houses in Gustavia on the island of Saint-Barthelemy Kevin Barrallon/AFP Hurricane Irma – devastation caused in pictures The damage on the island of Saint-Martin, a day after Hurricane Irma hit AFP/Getty Images Hurricane Irma – devastation caused in pictures A man carrying an umbrella is battered by the wind in Fajardo, Puerto Rico Reuters/Alvin Baez Hurricane Irma – devastation caused in pictures A lone police car on patrol during the passing of Hurricane Irma in Fajardo, Puerto Rico Jose Jimenez/Getty Images Hurricane Irma – devastation caused in pictures Haitian people walk through the wind and rain on a beach in Cap-Haitien on September 7 as Hurricane Irma approaches Hector Retamal/AFP/Getty Images Hurricane Irma – devastation caused in pictures A flooded street on the island of Saint Martin AFP/Getty Images Hurricane Irma – devastation caused in pictures A tree collapsed on a house in Saint Martin Hurricane Irma – devastation caused in pictures A hotel in Saint Martin is gutted by floodwater during the hurricane Guadeloupe 1ère Hurricane Irma – devastation caused in pictures Cars submerged in Saint Martin Rinsy Xieng Hurricane Irma – devastation caused in pictures Debris floats amongst the floodwater in Saint Martin @la1ere Hurricane Irma – devastation caused in pictures Household items float down the street in Gustavia, Saint-Barthélemy Carole Greaux Hurricane Irma – devastation caused in pictures The coast of Saint Martin is flooded as the hurricane hits the island Météo Express Hurricane Irma – devastation caused in pictures A whole street underwater in Saint Martin @la1ere Hurricane Irma – devastation caused in pictures A car crashes into the tree amongst the chaos in Saint Martin @Bondtehond Hurricane Irma – devastation caused in pictures A building on the Saint Martin seafront, destroyed by the hurricane @Bondtehond Hurricane Irma – devastation caused in pictures A mobile home overturned at Princess Juliana International Airport in Saint Martin @Bondtehond Hurricane Irma – devastation caused in pictures Palm trees bend in the wind in San Juan, Puerto Rico as Hurricane Irma slammed across islands in the northern Caribbean Reuters/Alvin Baez Hurricane Irma – devastation caused in pictures A woman runs in the rain as Hurricane Irma slammed into San Juan, Puerto Rico Reuters/Alvin Baez Hurricane Irma – devastation caused in pictures A picture taken on September 5, 2017 shows a view of the Baie Nettle beach in Marigot, with the wind blowing ahead of the arrival of Hurricane Irma AFP/Getty Images Hurricane Irma – devastation caused in pictures A man rides past a boarded up house as part of preparations ahead of the arrival of Hurricane Irma on September 5, 2017, in the French overseas island of Guadeloupe Helene Valenzuela/AFP Hurricane Irma – devastation caused in pictures Employees of the Mercure Hotel fill sand bags on the Baie Nettle beach in Marigot, as part of the preparations for the arrival of Hurricane Irma Lionel Chamoiseau/AFP Hurricane Irma – devastation caused in pictures People in line at Costco, as they find out the store has ran out of water on September 5, 2017 in North Miami Michele Eve Sandberg/AFP Hurricane Irma – devastation caused in pictures Night view of the city of Cap-Haitien, in the north of Haiti, 240 km from Port-au-Prince, on September 5, 2017 Hector Retamal/AFP

Irma began lashing Puerto Rico with rain at mid-morning. Governor Ricardo Rossello told residents to stay inside as the storm bore down on the island. “There is no reason to be in the street,” Mr Rossello told a midday press conference.

Many businesses in the capital San Juan were closed and many buildings were covered with storm shutters. Occasional shoppers were out making final purchases of water, ice and food to prepare for what could be several days without power.

Rene Franco, a 37-year-old medical student, said he had still not decided whether to flee to a shelter.

“I feel ready. I bought groceries. I bought water — too much water,” he said as he walked his 12-year-old dog Heaven before the storm arrived. “In the past I have always stayed in my house but this time it depends. It depends on the waves and the water. This is a very difficult storm.”

Dramatic footage as NOAA plane flies into Irma

After Irma battered the island nation of Antigua and Barbuda, emergency officials reported three injuries and minimal damage, with some roofs blown off. Prime Minister Gaston Browne said flights would resume from the airport Wednesday afternoon.

Many of the Caribbean's Leeward Islands were under a hurricane watch, including the Turks and Caicos Islands and the southeastern Bahamas, the NHC said.

In Paris, the French government said it had delivered water and food to two overseas territories, St. Martin and St. Barthelemy, and that emergency response teams would be sent once the storm had passed.

Power was knocked out on both islands, according to prefecture officials on Guadeloupe. At least four buildings were damaged and low-lying regions had been flooded, French Interior Minister Gerard Collomb said.

The UN World Food Programme prepared to provide emergency aid to Haiti if it was hit by Irma. The country was ravaged by a 2010 earthquake and Hurricane Matthew last year.

US President Donald Trump said he and aides were monitoring Irma's progress. “But it looks like it could be something that will be not good. Believe me, not good,” he told reporters at the White House.

Mr Trump, whose Mar-a-Lago estate in Palm Beach, Florida, could take a direct hit from the storm, has already approved emergency declarations for Florida, Puerto Rico and the US Virgin Islands, mobilising federal disaster relief efforts.

Florida Governor Rick Scott said Irma could be more devastating than Hurricane Andrew, a Category 5 storm that struck the state in 1992 and still ranks as one of the costliest ever in the United States.

Residents of the Florida Keys, a resort archipelago at the state's southern tip, were ordered to leave by Wednesday evening. Residents of low-lying areas in densely populated Miami-Dade County were urged to move to higher ground.

“We can expect additional evacuations as this storm continues to come near our state,” Scott said at a news conference in the Keys.

He said 7,000 National Guard troops would report for duty on Friday, ahead of the storm's expected arrival.

In South Carolina, Governor Henry McMaster also declared a state of emergency and urged residents to prepare for Irma's potential landfall there.

“It's too soon to rule out any possibilities,” said Kim Stenson, director of the South Carolina Emergency Management Division. “Hurricane Irma is a dangerous storm and its projected path could put South Carolina in harm's way. Fortunately, people in South Carolina have time.”