The potential flood zone encompasses roughly 3,500 homes in Georgetown, 37 miles (60 km) south of Myrtle Beach, and the coastal resort community of Pawleys Island where as many as 8,000 people live, Georgetown County spokeswoman Jackie Broach-Akers said.
Authorities warned residents in harm’s way with recorded telephone messages and home visits. The county opened two emergency shelters on Monday, and hotels in nearby Myrtle Beach were offering discounts to evacuees. Public schools were closed until further notice.
State transportation crews were working to erect temporary dams on either side of U.S. Highway 17, the main coastal route through the area, and National Guard engineers were installing a floating bridge at Georgetown in case the highway is washed out at the river.
In North Carolina, Governor Roy Cooper said on Monday that seven rivers in the southeast part of the state were at major flood stages and three others at moderate flood stages.
Meanwhile a new storm was brewing in the Atlantic Ocean on Tuesday, bringing scattered showers and thunderstorms across the Carolinas on Tuesday and Wednesday, according to the National Hurricane Center.
Florence dumped 30 to 40 inches (75 to 100 cm) of rain on Wilmington, North Carolina, alone.
Insured losses from Hurricane Florence will range from $2.8 billion to $5 billion, according to RMS, a risk modeling and analytics firm.