Hurricane Irma lashed the Florida mainland, where anxious residents dreaded being "punched in the face" by the monster storm after it whipped the Keys island chain with fearsome wind gusts.
Six million people — one third of the state's population — have been ordered to flee the path of the hurricane, which weakened to a Category Two storm as it churned past the Keys on Saturday, packing top winds of 110 miles (177 kilometers) per hour.
At 3:35 pm (1935 GMT), the storm made its second Florida landfall, hitting Marco Island near the popular shopping and golf destination of Naples, hours after striking the Keys island chain.
"It's going to be horrible," Florida Governor Rick Scott said on NBC's "Meet the Press."
"Now we have to hunker down and watch out for each other."
After a cabinet briefing from Homeland Security and emergency officials, President Donald Trump said he would travel to the state "very soon."
"Right now, we're worried about lives, not cost," he said.
Trump also approved Florida's request for emergency federal aid to help with the recovery from destructive Hurricane Irma. The federal funding includes "grants for temporary housing and home repairs, low-cost loans to cover uninsured property losses and other programs to help individuals and business owners recover from the effects of the disaster," the White House said on Sunday.
Bob Buckhorn, mayor of the low-lying city of Tampa, was blunter: "We are about to get punched in the face by this storm."
One of the mightiest hurricanes ever to slam storm-prone Florida, Irma is threatening dangerous storm surges of up to 15 feet (4.5 meters), enough to cover a house, as it collides with the state after sowing devastation through the Caribbean.
"I am concerned about people that don't believe in the storm surge," said Virginia Defreeuw, 76, who fled from her mobile home in Naples to a shelter. "You need to be afraid of the storm surge! People are not listening."
In Miami, the storm brought at least two construction cranes crashing down, while the glitzy Brickell neighbourhood was flooded.
Steven Schlacknam, a 51-year-old visual artist staying in a 37th floor apartment, said the waters were "coming over the sea walls."
"The wooden pier is basically gone," he told AFP.
At least 30 deaths are attributable to the storm, including three in Florida. The US victims included a sheriff's deputy killed in a head-on collision early yesterdayas she drove home to get supplies after working in a shelter all night.
With its high winds and rains now impacting all of south Florida, the storm is currently moving up along Florida's western Gulf coast from Naples to Fort Myers and the densely populated Tampa Bay peninsula.
Irma closed in on the coast after ripping boats from their moorings, flattening palm trees and tearing down power lines across the Key West island chain popular for fishing and scuba diving.
"There's absolutely no way anybody can be outside right now," Maggy Howes, a first responder on Key Haven, told CNN. "You would not be able to stand or walk."
Irma smacked the Keys 57 years to the day that Hurricane Donna hit the same area in 1960, destroying nearly 75 percent of the island chain's buildings.
A shelter of last resort set up in the Middle Keys city of Marathon was reported to be without power or running water, and surrounded by surging waters.
"Everything is underwater, I mean everything," Larry Kahn, an editor for local news website FlKeysNews.com, reported from inside.
The storm also led to some uniquely Floridian responses, with a sheriff forced to warn residents not to shoot at the storm after an online prank promoting the idea went viral.
"To clarify, do not shoot weapons at Hurricane Irma," the office of the sheriff of Pasco County, on the state's west coast, tweeted late Saturday hours before the hurricane made landfall.
On the mainland, emergency services in Miami were sheltering in place, and a dispatcher talked a woman through delivering her own baby last morning, Assistant Fire Chief Eloy Garcia told the Miami Herald.
At least two towering construction cranes had collapsed downtown, according to residents and details on social media.
Miami, lined with glittering skyscrapers, has about 25 cranes on construction sites of 50 floors or higher, city manager Daniel Alfonso said.
Nearly two million Florida homes and businesses lost power, according to utility company Florida Power and Light, which said it had "safely shut down" one of two nuclear reactors at its Turkey Point power plant.
The National Weather Service urged Floridians to keep their shoes on, to take shelter in interior rooms -- far from windows -- and use helmets, mattresses, pillows or blankets for protection.
Before reaching the United States, Irma smashed through a string of Caribbean islands from tiny Barbuda on Wednesday, to the tropical paradises of Saint Barthelemy and Saint Martin, the US Virgin Islands, Puerto Rico, the Dominican Republic, Haiti and the Turks and Caicos.
Terrified Cubans who rode out Irma in coastal towns — after it made landfall Friday on the Camaguey archipelago as a maximum-strength Category Five storm — reported "deafening" winds, uprooted trees and power lines, and blown rooftops.
There were no immediate reports of casualties in Cuba but it caused significant damage, and enormous waves lashed the Malecon, Havana's emblematic seafront, with seawaters penetrating deep into the capital.
Irma is so wide that authorities faced destructive storm surges on both coasts of Florida and the Keys as Irma follows a path north toward Georgia.
The NHC also warned of tornado risks through last night, with the greatest threat in areas east of the storm's path.
Businesses on both Florida coasts were shuttered.
MacDill Air Force Base in Tampa, the military installation home to US Central Command, issued mandatory evacuation orders ahead of the storm's passage early today, while the Kennedy Space Center on the east coast was also closed.
With inputs from AFP
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Updated Date: Sep 11, 2017 07:17:29 IST