The storm was centered about 905 miles east-southeast of Bermuda and moving west at 7 mph.
Just where the storm will head is still uncertain, but computer models used by the center's specialists to forecast track indicated a US landfall looked increasingly likely.
North Carolina Gov. Roy Cooper declared a State of Emergency on Friday evening, urging residents to use the weekend to prepare for the possibility of a natural disaster. Maximum sustained winds are now at 65 miles per hour and the storm is moving west at 9 miles per hour southeast of Bermuda.
More and more, Florence is looking like a storm that may give the US East Coast problems as a potentially major hurricane next week.
But increasing wind shear, as Helene drifts further west, should weaken her at the start of the work week. On the forecast track, the center of Florence will move over the warm waters of the southwestern Atlantic Ocean through Wednesday.
As of early September, the 2018 hurricane season had been calm compared to the frenzy of 2017, in which three major storms - Harvey, Irma, and Maria - wrought havoc in the Caribbean and on the US mainland. This will accelerate the hurricane toward the middle of the U.S. East Coast.
Tropical Depression Nine is expected to become Tropical Storm Isaac late Saturday.
Tiger Woods, Phil Mickelson, Bryson DeChambeau picked for US Ryder Cup team
The idea is to find the hottest player to fill out the team, and no one has been close to DeChambeau over the last two weeks. Woods was an assistant at Hazeltine and at the Presidents Cup last fall at Liberty National in a US route.
In the Eastern Atlantic the disturbance east of the Cabo Verde Islands has strengthened into Tropical Storm Helene, the eighth named storm of the 2018 Atlantic Hurricane season.
Tropical Depression 8 will bring heavy rain to the Cabo Verde islands over the weekend and a tropical storm warning is in effect for a portion of the islands.
First up there's Tropical Storm Florence. It's likely that Florence will be a rather strong hurricane, and it will begin to angle to the northwest again.
Helene will likely become a hurricane next week.
It is expected to regain hurricane strength as it nears Bermuda, although forecasters said it was too soon to tell where the storm would hit.
A map of the tropical storm activity stretching across the Atlantic Ocean looks a little like someone suddenly opened a floodgate, with a series of four storms strung out across the sea between the United States and Africa.
Hurricane Olivia had maximum sustained winds of 90 mph, and was approximately 1,370 miles east of Honolulu as of 11 p.m. local time.