The forecast continues to call for Florence to slam ashore as a major - Category 3 or stronger - storm before weakening slightly, but still as hurricane, as it heads inland.
By 11 p.m. Sunday, Florence was moving across the Atlantic Ocean at about 7 miles per hour, and it was almost a Category 2 hurricane, with peak winds of 90 miles per hour.
Hurricane Florence is expected to be back at major hurricane status sometime Monday, and could impact the mid-Atlantic coast late this week as a category 4 hurricane. Forecasters also warned of a rising threat of life-threatening storm surge, along with the damaging winds. You can clearly see the dimple at the center of the swirling clouds in Arnold's images.
A forecast from the hurricane center projected that Florence will pick up speed in the coming days.
One model the weather service uses shows Florence making landfall along the southern Outer Banks, then interacting with a low-pressure trough moving across the Great Lakes that steers the storm back out to sea early next week, Wimberley said.
Once it makes landfall, Florence is predicted to stall and remain over North Carolina for at least 24 hours - increasing the threat of unsafe flooding, NHC director Ken Graham said on Monday.
Hurricane Helene is expected to turn north into the middle of the Atlantic Ocean, according to the National Hurricane Center.More news: Burt Reynolds dead at 82
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The coasts of SC and North Carolina have only been hit by about a dozen Category 3 storms since 1850.
The other storms Tropical Storm Isaac and Tropical Storm Helene are both expected to become hurricanes Sunday or Monday.
SC ordered an estimated one million people to evacuate its coast today as the state and neighbouring North Carolina brace for Hurricane Florence.
Stocks in weather-sensitive industries reacted as Hurricane Florence moved closer to the U.S. East Coast on Monday. Impacts of the hurricane can also extend far from the center of the storm. Further, residents and tourists should expect heavy prolonged rain upon the storm's arrival. No doubt evacuation orders will continue over the next few days for cities and town up and down the Coastline in those areas. The state's emergency management agency said it is "preparing for the possibility of a large-scale disaster".
At 0500 GMT Isaac, which the NHC called a small hurricane, was about 1,200 miles east of the Windward Islands - a region still recovering from last year's powerful Hurricane Maria - with maximum sustained winds near 75 miles per hour.
The New Jersey and DE coastlines will feel the effects from Florence by Tuesday afternoon regardless as swells increase and risky rip currents begin.
Hurricane Florence is now at a Category 4.