Category 4 Hurricane Irma continues to track toward Florida and the state is bracing for a direct hit.
As of the 5 p.m. advisory from the National Hurricane Center, Irma's track shifted west and the storm has maximum sustained winds of 155 mph.
The 5 p.m. advisory projects that the storm will strengthen back to Category 5 as it hits the Florida Keys.
Evacuate now and avoid Irma's wrath
Residents of the Miami area and the Florida Keys streamed north in packed vehicles Friday morning, anxiously rushing to dodge Hurricane Irma as the deadly Category 4 storm took aim at the state's eastern coast after devastating the Caribbean.
The dramatic mass exodus from South Florida could turn into one of the largest evacuations in US history, CNN senior meteorologist Dave Hennen said. Miami-Dade, Broward and Palm Beach counties are home to about 6 million people combined.
But the clock is ticking for those who haven't left yet, officials warned.
"Get inland for safety," Florida Gov. Rick Scott said.
"Based on what we know, the majority of Florida will have major hurricane impact and deadly winds. We expect this along the entire east coast and west coast," the governor said at a news conference. "All Floridians should be prepared to evacuate."
Thousands of motorists braved clogged roads, backups and slowdowns to get out. Some drivers waited for hours at gas stations, some of which ran out of fuel. The Florida Highway Patrol escorted fuel tankers so they could reach and resupply gas stations, the agency reported.
Travel hot spots included Interstates 95 and 75, and the Florida Turnpike. Troopers monitored roadways, stepping in to help after fender-benders and with disabled cars and trucks.
Mandatory evacuation orders covered parts of Miami-Dade County, Broward County east of US 1, Palm Beach County, low-lying parts of Brevard County, coastal and low-lying areas of Jacksonville and Duval County, and Monroe County, home to the Florida Keys.
The evacuation of Miami-Dade County was the largest in the county's history, with an estimated 660,000 people asked to leave, Mayor Carlos Gimenez said.
'You could die'
Some people heard officials' dire admonition loud and clear.
"If you don't heed the warning, you could die," Key Largo resident Don Anderson told CNN. "This is your life. What's it worth? You can always party later."
Ignoring official advisories, other residents stocked up on supplies and prepared to ride it out.
"I have been here 15 years and been through so many storms. We have been told many times to evacuate," said Scott Abraham, who lives on the 11th floor of a building on Miami Beach. "I don't think it's going to hit us directly. If it does, I think we are safe. We have food. We have supplies. We have everything we need."
"We are ready to rock and roll with the storm," he said.
Flying out of the storm zone
Some Floridians unwilling to risk chaos on the highways opted to try to fly out of town. Delta Air Lines added flights out of Miami, Fort Lauderdale and Key West to Atlanta, its largest hub, and allowed passengers affected by Irma to rebook flights for free, the airline said.
American Airlines and United Airlines also waived change fees for passengers impacted by Irma, the airlines said. American planned to wind down operations Friday afternoon at its Miami hub, as well as in other south Florida cities, then to cancel flights throughout the weekend, the airline said.
Irma's impending landfall had forced airlines serving some of the nation's largest airports to plan to shut down operations. By late Saturday, Miami, Orlando and Fort Lauderdale -- home to the 12th, 13th and 21st largest airports in the US, respectively -- were expected to be largely dormant.
Stranded at the airport
Kevin Brokbals, who hails from Germany, was among several dozen people who spent the night on cots at Miami International Airport. He planned to be stuck for a while and said airport officials hadn't given much sense of his options.
"The airport didn't tell us anything," he said. "We asked some police officers to give us any information because there was no one officially from the airport."
First, he and others were told they had to leave the airport and head to a shelter. Then, they were told all shelters were full.
"And we have to stay here," he said. "We can't stay upstairs because there are too many windows, too many glasses which can break. And that's why they want all the people in one area, even though it's not a shelter."
Leila Traversoni, of Argentina, visited Miami to shop for her wedding dress and a tuxedo for her fiancé. The couple is desperate to get back home; they've never been through a hurricane.
"I am very afraid," Traversoni said. "I am terrified. I don't know what to do. We don't have any place to go. We are looking for a shelter."
Traversoni said she's hoping for an answer from American Airlines or airport staff.
"We don't know what to expect," she said. "We are really, really terrified because we don't know what to do, where to go -- just praying at this point."
Other people planned to stay put to protect their homes.
"I evacuated Matthew," one Merritt Island resident said, referring to last year's hurricane. "I feel this is going to be a Category 2 or 3 by the time it hits us. I've got a pretty strong home, so I'm pretty confident it will survive."
Wary of tornadoes, though, he said he could change his plans if it looks like Irma could strike as a Category 4 or 5 storm.
"I'm watching the weather and the news and keeping track with the storm," he said.
Linda Blackshear, who lives in South Florida, also planned to stay. She doesn't live in an evacuation zone, she said, and her grandson lives with her.
"I feel safe," she said, adding that she has no place to evacuate to. "I have all the supplies and all the essentials."
On the road
Roseanne Lesack, her husband and three children were among the evacuees.
They left Boca Raton on Wednesday and headed to Atlanta to stay with friends, she said. After encountering slow traffic, the family spent the night at a motel in Orlando and continued north Thursday morning, Lesack said.
"What should have been another six- or seven-hour travel experience is coming up on 12 hours," she said Thursday night from her vehicle, about 35 miles south of Atlanta. "It has been slow. Right now, we're going about 20 mph. ... It's just three lanes of red bumper lights."
Last year, the family stayed with friends in Florida to ride out Matthew, she said, adding that she was glad they decided not to chance it now.
"Now, there are a lot of people who are really nervous about staying but don't feel like they can get out," Lesack said.
Warnings and watches
By Friday, tropical storm-force winds from Irma covered more than 65,000 square miles -- about the area of all of Florida, and the National Hurricane Center had issued hurricane and storm surge warnings for South Florida. Irma's cone of potential landfall included almost the entire state of Florida, meaning residents would not be able to flee to the state's Gulf Coast to avoid its wrath.
As the storm plodded toward the United States, more warnings echoed from public officials and experts:
- "We cannot save you in the middle of a storm," Scott said at a news conference Friday..
- "You do not want to leave on Saturday, driving through Florida with tropical storm-force winds," CNN meteorologist Tom Sater said.
- "This is not a Category 1. This is not one to ride out and say, 'Oh, it's just a blow, we'll be fine.' No. If you're in the Keys, you need to go. This isn't an 'always fine' kind of storm," CNN meteorologist Chad Myers said.
Without knowing exactly where Irma would make landfall, governors in Georgia and South Carolina decided not to take chances, ordering mandatory evacuations of low-lying coastal areas around Savannah and Charleston.