The Governors of both states declared states of emergency.
"We do not want to risk one South Carolina life in this hurricane," Governor Henry McMaster told a news conference.
He estimated about 1 million residents would flee the coast of his state, following earlier orders for the evacuation of more than 50,000 people from the southern
-most Outer Banks barrier islands of North Carolina.
The National Weather Service said Hurricane Florence will bring life-threatening storm surge and rainfall to parts of the Carolinas and Mid-Atlantic states.
Florence, one of the strongest hurricanes will churn toward the eastern seaboard in decades. It is expected to bring catastrophic winds, flooding and storm surge.
"This is one of the worst storms to hit the east coast in many years," President Donald Trump warned on Twitter. "Please be prepared, be careful and be SAFE!"
The President said: "The safety of American people is my absolute highest priority. We are totally prepared. We are ready. We’re as ready as anybody’s ever been."/.