National Hurricane Centre director Ken Graham warned that Florence is forecast to linger over the Carolinas once it reaches shore.
Packing winds of up to 220 km/h (140 mph) late Monday, Florence was expected to further strengthen and become "an extremely risky major hurricane" by the time in makes landfall in the Carolinas on Thursday, the National Hurricane Center (NHC) said in a 21:00 UTC update.
"They're going to pre-position us and get us in the area of where the storm is going to hit, and then they'll move us to wherever we're needed", he added. "It is likely some areas will flood that have never flooded before". Combined with high tides, the storm surge could swell as high as 12 feet.
Once the storm hits land, its powerful 130-mile per hour winds are projected to lessen to still potent 50-mph winds over the next day.
The storm is expected to make landfall between North and SC, with Mr Kottlowski predicting that it will cause "devastation" when it does hit land.
Hurricane Florence was upgraded to a category 4 Hurricane Monday morning and it continues to build in size, strength and speed, says the National Hurricane Center. While national reconnaissance aircraft noted this morning the hurricane weakened slightly, it's expected to strengthen again later today.
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For many people, the challenge could be finding a safe refuge: If Florence slows to a crawl, it could bring torrential rains all the way into the Appalachian mountains and as far away as West Virginia, causing flash floods, mudslides and other risky conditions in places that have already experienced lots of rain recently. With 1-to-3 feet of rainfall expected in some areas, significant river flooding will occur.
Panovich said one thing to worry about is the storm slowing down as it approaches the Carolina's.
Florence's forecast cone for the next 48 hours has narrowed, indicating high confidence in the forecast track.
Residents of the eastern United States - particularly the Carolinas and Virginia - are bracing for a hurricane, as Hurricane Florence gathers power while forming over the Atlantic.
Gov. Larry Hogan on Monday declared a state of emergency ahead of the storm's arrival, allowing the state to muster personnel and equipment needed to deal with possible flooding and wind damage.
Although it's hard to attribute any storm's intensification to one specific factor over another, a scientist explained some of the potential reasons to Fox News. Hurricane force winds start at 74 miles per hour. Also, looking like a direct hit on North Carolina, South Carolina and Virginia. "We are taking Hurricane Florence seriously".