Hurricane Irma attacks Cuba with a strong wind and heavy rain after the destruction of several Caribbean islands.
The hurricane landed on the Camaguey archipelago, in north-eastern Cuba, as a category five storm.
But the Bahamas were largely spared after Irma changed the course.
In Florida, 5.6 million people or 25% of the US population were invited as the storm approached. At least 20 people have died so far in the Caribbean.
Irma hit the Sabana Camaguey archipelago on Friday, threatened neighboring coastal towns and villages.
It was the first hurricane of five categories to meet Cuba for decades. It weakened to category four Saturday morning, but is expected to strengthen it as it comes to Florida.
At 1200 GMT, Irma had maximum sustained winds of 209km / h (130mph), the National Hurricane Center said in the United States.
He reported large amounts of rainfall in parts of Cuba, with numerous flooding in the fishing village Caibarien.
Power lines were lowered in several parts of the central province of Camaguey, and communications are becoming increasingly difficult with cities in the more remote areas, according to the BBC's Will Grant Act in Havana.
Thousands of people were evacuated, but many others remained out of the storm.
Cuban officials have reported "significant damage" without giving any details, but there have been no confirmed losses, AFP reported.
Previously, people tried to secure their roofs and move personal effects from low coastal areas to higher ground.
"There are really strong wind blows, it spreads and burns, and the lights go out," said Anaida Gonzalez, a retired nurse in Camaguey province.
Irma is expected to meet Florida on Sunday.
Brocklong, head of the US Federal Emergency Agency, warned that Irma was "devastating" Florida or neighboring states.
He said that parts of Florida would be powerless during the day.
"The whole Southeast of the United States is waking up and paying attention," he added.
Florida governor Rick Scott said that all Floridians should be prepared for possible evacuation and issued a serious warning to those who are in threatened areas.
"We do not have time, if you're in an evacuation zone, you have to go now," he told reporters.
"Remember, we can rebuild your house, we can not rebuild your life."
What other areas are already affected?
- St. Martin and St. Barthélemy: Six houses of 10 on St. Martin, an island divided between France and the Netherlands, now uninhabitable, say the French authorities. They said nine people had died and seven had disappeared in the French territories, while two died in the Dutch Sint Maartensland is "not habitable", with 95% of buildings damaged. The Prime Minister of Antigua and Barbuda, Gaston Browne, estimates that the reconstruction will cost $ 100 million (£ 80 million). A death was confirmed
- Anguilla: extensive damage with a confirmed person dead
Puerto Rico: More than 6,000 inhabitants of American territory are in lodgings and much more without power. At least three people died
- British Virgin Islands: widespread reported damage
- American Virgin Islands: infrastructure damage widespread, four deaths confirmed
- Haiti and the Dominican Republic: Both were beaten by the storm, but no harm was so much fear
Are there any more hurricanes?
Another storm, Jose, further down the Atlantic behind Irma, is now a category four hurricane, with winds of up to 240 km / h (150 mph).
This is followed by a similar path as Irma, and has already hindered relief efforts in some of the most affected areas.
Residents of Barbuda, where 95% of the buildings of Irma were destroyed, left the island as Jose approached.
Hurricane Katia, in the Gulf of Mexico, a category of a storm with winds up to 75 mph, landed on the Mexican Gulf Coast in the state of Veracruz at the end of Friday.
The storm is expected to weaken quickly in the coming hours.