Hurricane Matthew marched toward Florida, Georgia and the Carolinas and at least a half a million people along the coast were urged to evacuate their homes Wednesday, a mass exodus ahead of a major storm packing power the U.S. hasn't seen in more than a decade.

Matthew was a dangerous and life-threatening Category 3 storm with sustained winds of 120 mph (190 kph) as it passed through the Bahamas, and it was expected to be very near Florida's Atlantic coast by Thursday evening. At least 11 deaths in the Caribbean have been blamed on the storm, with heavy damage reported in Haiti.

The storm was forecast to scrape much of the Florida coast and any slight deviation could mean landfall or it heading farther out to sea. Either way, it was going to be close enough to wreak havoc along the lower part of the East Coast, and many people weren't taking any chances.

In Melbourne Beach, near the Kennedy Space Center, Carlos and April Medina moved their paddle board and kayak inside the garage and took pictures off the walls of their home about 500 feet from the coast. They moved the pool furniture inside, turned off the water, disconnected all electrical appliances and emptied their refrigerator.

They then hopped in a truck filled with legal documents, jewelry and a decorative carved shell that had once belonged to April Medina's great-grandfather and headed west to Orlando, where they planned to ride out the storm with their daughter's family.

"The way we see it, if it maintains its current path, we get tropical storm-strength winds. If it makes a little shift to the left, it could be a Category 2 or 3 and I don't want to be anywhere near it," Carlos Medina said. "We are just being a little safe, a little bit more cautious."

About 20 miles away in the town of Cape Canaveral, John Long said Hurricane Matthew is just hype as his neighbors in his RV park packed up and evacuated inland. Even though his 32-foot RV is just feet from the Banana River and a half mile from the beach, he had no plans to leave.

Long, who owns a bike shop and has lived along the Space Coast for 30 years, said he has a generator and enough food and water for himself and his cats to last a week.

"There's always tremendous buildup and then it's no stronger than an afternoon thunderstorm," he said. "I'm not anticipating that much damage."

In Fort Lauderdale, about 200 miles south, six employees at a seven-bedroom Mediterranean-style mansion packed up for an evacuation fearing any storm surge could flood the property. The homeowners planned to move to another home they own in Palm Beach that's further from the water. Two Lamborghinis and a Ferrari had been placed inside the garage, but employee Mae White wasn't sure what they would do with a Rolls Royce, Mustang and other cars still parked in the driveway.

"This storm surge. It's scary," White said. "You're on the water, you've got to go."

The last Category 3 storm or higher to hit the United States was Wilma in October 2005. It made landfall with 120 mph (190 kph) winds in southwest Florida, killing five people as it pushed through the Everglades and into the Fort Lauderdale and Palm Beach area. It caused an estimated $21 billion in damage and left thousands of residents without power for more than a week. It concluded a two-year span when a record eight hurricanes hit the state.

As of 5 p.m. EDT Wednesday, Matthew was centered about 400 miles (640 kilometers) southeast of West Palm Beach and moving northwest, according to the National Hurricane Center. Hurricane-force winds extended 45 miles (72 kilometers) from the center.

"When a hurricane is forecast to take a track roughly parallel to a coastline, as Matthew is forecast to do from Florida through South Carolina, it becomes very difficult to specify impacts at any one location," said National Hurricane Center forecaster Lixion Avila.

Florida can expect as much as 10 inches of rain in some isolated areas.

At Folly Beach, South Carolina, southwest of Charleston, Gaby Trompeter loaded her car at her beachfront home preparing to evacuate to Augusta, Georgia.

Trompeter, a 50-year-old goldsmith who designs and makes jewelry, remembers Hurricane Hugo when she stayed in Savannah, Georgia, in 1989.

A year ago when what has been described as a 1,000-year flood inundated South Carolina there was so much water on the road near her house she couldn't get out for three days.

"If it brings a lot of rain, more than the storm last year, why would I want to stay?" she said.

President Barack Obama visited the Federal Emergency Management Agency's headquarters Wednesday to be briefed on preparations. FEMA has deployed personnel to emergency operation centers in Florida, Georgia, South Carolina and North Carolina. It's also positioning commodities and other supplies at Fort Bragg in North Carolina and in Albany, Georgia.

On the Georgia coast, 92-year-old Lou Arcangeli saw two of his adult children come to his home on Tybee Island to help prepare and evacuate if necessary.

"It's serious," said Arcangeli, who has lived in the Savannah area since 1979, when Hurricane David became the last hurricane to make landfall on Georgia's 100-mile coast. "I'm going to keep an eye on it and not wait until the last minute. As far as I'm concerned, what's going to happen is going to happen."

Farmers in Matthew's path scrambled to protect their crops. In South Carolina, Jeremy Cannon was harvesting his soybeans a week early after waiting too long before last year's record rainstorm. He watched his soybeans and cotton crops slowly drown as 20 inches of rain fell, costing him $800,000.

"I don't want to lose a single soybean this year if I don't have to," Cannon said. "The Lord says pray without ceasing. And that's what I've been doing -- in the fields, near the barn -- just praying all the time. I don't want to find out what I'll have to do if I get wiped out for another year."

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Kennedy reported from Fort Lauderdale. Associated Press reporters Terry Spencer in Fort Lauderdale, Freida Frisaro in Miami, Jennifer Kay in Miami Beach, Florida, Russ Bynum in Savannah, Georgia, Martha Waggoner in Raleigh, North Carolina, Jeffrey Collins, Jack Jones and Meg Kinnard in Columbia, South Carolina; Bruce Smith in Charleston, South Carolina.