Extensive Live Video Coverage: Florida gets set for Cat 4 Hurricane Dorian. We have all the latest news on the storm.

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As Dorian closed in, Labor Day weekend plans were upended. Major airlines began allowing travelers to change their reservations without fees. The big cruise lines began rerouting their ships. Disney World and Orlando’s other resorts found themselves in the storm’s projected path.

Still, with Dorian days away and its track uncertain, Disney and other major resorts held off announcing any closings, and Florida authorities ordered no immediate mass evacuations.

“Sometimes if you evacuate too soon, you may evacuate into the path of the storm if it changes,” Gov. Ron DeSantis said.

But some counties announced mandatory evacuations ahead of time on Friday. Brevard County and Martin County officials said residents of barrier islands, mobile homes and low-lying areas would be under a mandatory evacuation order beginning Sunday morning. The Brevard County order includes the Kennedy Space Center. Indian River County officials said they will recommend residents of its barrier island voluntarily evacuate once hurricane warnings are issued.

Homeowners and businesses rushed to cover their windows with plywood. Supermarkets ran out of bottled water, and long lines formed at gas stations, with some fuel shortages reported.

At a Publix supermarket in Cocoa Beach, Ed Ciecirski of the customer service department said the pharmacy was extra busy with people rushing to fill prescriptions. The grocery was rationing bottled water and had run out of dry ice.

“It’s hairy,” he said.

Early Saturday, Dorian was centered 445 miles (715 kilometers) east of West Palm Beach. It was moving northwest at 12 mph (17 kph). Forecasters warned that its slow movement means Florida could face a prolonged wallop of wind, storm surge and torrential rain.

Coastal areas of the southeastern United States could get 6 to 12 inches (15 to 30 centimeters) of rain, with 18 inches (46 centimeters) in some places, triggering life-threatening flash floods, the hurricane center said.

Also imperiled were the Bahamas, where canned food and bottled water were disappearing quickly from shelves and the sound of hammering echoed across the islands as people boarded up their homes. Dorian was expected to hit the northwestern part of the Bahamas by Sunday with the potential for life-threatening storm surge that could raise water levels 15 feet (5 meters) above normal.

“Do not be foolish and try to brave out this hurricane,” Prime Minister Hubert Minnis said. “The price you may pay for not evacuating is your life.”