Hurricane Dorian has gained fearsome new muscle as an "extremely dangerous" Category 4 storm, bearing down on the northwestern Bahamas early Saturday en route to the U.S. Southeast coast.

The National Hurricane Center in Miami cautioned that its meteorologists remain uncertain whether Dorian would make a devastating direct strike on Florida's east coast or inflict a glancing blow.

"There is hope," Weather Underground meteorology director Jeff Masters said.

The latest official forecast Saturday morning has ever-strengthening Dorian dancing up the Southeast coastline, but staying just off shore of Florida, with the possibility of "strong winds and life-threatening storm surge" increasing along Georgia and South Carolina's coasts.

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