TAMPA, Fla. - Hurricane Dorian continued to strengthen Friday and was upgraded to a Category 4 in the evening hours as Florida residents braced for what could be the most powerful storm to hit the state's east coast in nearly 30 years.
Hurricanes reaching Category 3 and higher are considered “major hurricanes” on the Saffir-Simpson Hurricane Wind Scale because of their potential for significant damage.
Dorian was located fewer than 600 miles east of West Palm Beach as of 9 p.m. EST. It had maximum sustained winds of 130 mph and was moving west at 9 mph.
The storm is expected to approach the northwest Bahamas on Saturday and then move over or near that region on Sunday.
President Donald Trump, whose Mar-a-Lago resort in Palm Beach was in the crosshairs, warned Thursday night it could be an "absolute monster."
"All indications are it's going to hit very hard and it's going to be very big," Trump said in a tweeted video, comparing Dorian to Hurricane Andrew, which obliterated thousands of homes south of Miami with winds topping 165 mph in 1992.
The National Hurricane Center said Friday the storm was expected to slam into the U.S. on Tuesday — nearly 10 mph faster and a day later than previously forecast.
The hurricane center's projected track showed the storm hitting around Palm Beach County, the site of Mar-a-Lago. But predicting its course with any confidence this far out is so difficult that the "cone of uncertainty" on the map covered nearly all of Florida's 500-mile coastline, with Miami, Fort Lauderdale and Orlando all within the danger zone.
"The question is does it turn north when it gets past us? Or does it turn north in the middle of the state? Or when it makes landfall?" said FOX 13 meteorologist Dave Osterberg in Tampa. "Three completely different forecasts with three outcomes that are completely different. It can be anywhere in the cone."
Osterberg said Friday morning that an upper-level, low-pressure system in the Straits of Florida was preventing Dorian from rapidly intensifying. However, as the low-pressure system moves south and Dorian moves west, then it may quickly strengthen.
"When that happens, you'll start to see a better-looking storm – structurally wise," Osterberg said. "This will happen over the course of the next 24 hours."
Forecasters warned that the storm's slow movement could subject the state to a drawn-out pummeling from wind, storm surge and heavy rain.
With the storm's track still unclear, no immediate mass evacuations were ordered.
Along Florida's east coast, local governments began distributing sandbags, shoppers rushed to stock up on food, plywood and other emergency supplies at supermarkets and hardware stores, and motorists topped off their tanks and filled gasoline cans. Some fuel shortages were reported in the Cape Canaveral area.
This Associated Press contributed to this report.