Hurricane Irma has lashed Cuba as it roared toward Florida, after hitting the eastern Caribbean with its devastatingly high winds, killing 21 people and leaving catastrophic destruction in its wake.
Irma, one of the most powerful Atlantic storms in a century, is expected to hit Florida on Sunday morning, bringing massive damage from wind and flooding to the fourth-largest state by population.
An evacuation, including from areas around Miami, has been made more difficult by clogged highways, gasoline shortages and the challenge of moving older people in the top retirement destination.
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The storm could regain strength and hit the Florida Keys as a Category 5 hurricane, the most powerful designation by the National Hurricane Center, with sustained winds of 258 km per hour.
The United States has experienced only three Category 5 storms since 1851, and Irma is far larger than the last one to hit the United States in 1992, Hurricane Andrew, according to the Federal Emergency Management Agency (FEMA).
"We are running out of time. If you are in an evacuation zone, you need to go now. This is a catastrophic storm like our state has never seen," Governor Rick Scott told reporters, adding that the storm's effects would be felt from coast to coast in the state.
A total of 5.6 million people, or 25 percent of the state's population, was ordered to evacuate Florida, the Associated Press reported, citing Andrew Sussman, the state's hurricane program manager.
US President Donald Trump said in a videotaped statement that Irma was "a storm of absolutely historic destructive potential" and called on people to heed recommendations from government officials and law enforcement. In Palm Beach, Trump's waterfront Mar-a-Lago estate was ordered evacuated.
Irma, currently a Category 4 storm with winds of 250 km/h, was about 510 km southeast of Miami, the National Hurricane Center (NHC) said in its latest advisory.
After passing the Bahamas earlier in the day, Irma periodically drenched Cuba with rain and wind from the outer edge of the storm. Irma was forecast to bring dangerous storm surges of up to six metres to the southeastern and central Bahamas and up to three metres on parts of Cuba's northern coast.
Cuba's Communist government has traditionally made rigorous preparations when the island is threatened by storms, and the country was at a near standstill as Irma began to drive up the northern coast from east to west.
Irma was forecast to move closer to land as it passed the centre of Cuba later in the day and on Saturday, when it could seriously damage resorts on vulnerable keys. Tourists, and even the dolphins that entertain them, were evacuated. The storm was then predicted to veer north, sparing western Cuba and Havana.