Between 1 millions and 3 million people will likely lose power when Hurricane Florence makes landfall later this week, according to a Wednesday report from Duke Energy.
Although the storm has been designated Category 3 rather than 4, emergency services were warning it could hit the coast with the force of a "Mike Tyson punch."
Florence was located about 325 miles (520 km) east-southeast of Myrtle beach, South Carolina, with maximum sustained winds of 110 miles per hour (175 km per hour), the Miami, Florida-based weather forecaster said.
The storm, which is building up over the Atlantic, is due to make landfall in either North or SC within the next few days, and is expected to be the worst storm to hit the area in 30 years.
With the change in the forecast, Georgia Gov. Nathan Deal issued an emergency declaration for the entire state to ease regulations on trucks hauling gasoline and relief supplies, and asked people to pray for those in Florence's path.
Another commenter said: 'That hurricane better be taking me to dinner first'.
The North Carolina coast is largely empty, as many people have fled in advance of Hurricane Florence. To escape any potential damage, they flew to the other side of the country, to Paine Field, an airport next to Boeing's Everett, Wash. assembly plant.
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"We hope to have something left when we get home", she said.
One wrote: 'I hope everyone in the path of Florence's massive penis stays safe'.
"The time to prepare is nearly over", North Carolina Governor Roy Cooper told a morning news conference.
"This is a real hurricane that we have coming and our goal is to protect lives and property", said Steve Goldstein, NOAA liaison to FEMA. "If you are on the coast, there is still time to get out safely".
Helene was weakening, however, and posed no danger to land, the NHC said, while Isaac could bring heavy rain to Martinique, Dominica and Guadeloupe.
More than 1 million have been ordered to evacuate the coastlines of the Carolinas and Virginia.
About 1.7 million residents have been urged to flee from parts of North and SC.
Another four million people are under a tropical storm watch.