Forecasters are warning everyone to stay out of the water along the coast.
Arthur became a Category 1 hurricane early Thursday. It was about 90 miles off Charleston about 8 am with maximum sustained winds of 80 mph.
The National Weather Service in Charleston is warning that swells sent in from the storm will mean breaking waves as high as 9 feet along the coast that could cause strong rip currents. There could be some beach erosion.
Forecasters are warning boaters to use caution, especially near pears and jetties.
Arthur is expected to make its closest pass to South Carolina off the Grand Strand on Thursday evening.