Meteorologist Ryan Maue of weathermodels.com said Florence could dump a staggering 18 trillion gallons of rain during a week on North Carolina, South Carolinas, Virginia, Georgia, Tennessee, Kentucky and Maryland.
Hurricane Florence is dumping rain on North Carolina and pushing a storm surge taller than most humans onto communities near the coast. The system is likely to weaken and strike as a Category 1 Hurricane as the winds have also weakened in strength a little as has been reported by the National Hurricane Center.
In one video, major flooding has gone up the steps of a home in Belhaven, North Carolina.
As of 6 a.m., Florence was 10 miles (20 kilometers) east of Wilmington, North Carolina.
More ominously, forecasters said the onslaught would last for hours and hours because Florence was barely creeping along at 6 mph (9 kph) and still drawing energy from the ocean. Hurricane-force winds extended 130 kilometres from its centre, and tropical-storm-force winds up to 315 kilometres.
The city of New Bern, North Carolina has promised that help is on its way to 150 people trapped by Hurricane Florence's inundation of the small town.
The hurricane is expected to move inland over parts of North Carolina and SC on Friday and Saturday, "then move generally northward across the western Carolinas and the central Appalachian Mountains early next week". The town's public information officer, Colleen Roberts, told CNN 150 more people were awaiting rescue.
Florence made landfall this morning around 7:15 a.m. near Wrightsville Beach. Forecasters said the torrents could continue for days, touching off disastrous flooding.
Tropical Storm Florence continued to thrash the Carolinas on Friday evening with fierce winds, driving rain and catastrophic flooding.
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The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large and destructive waves.
"We're on our way, we will get you rescued", Outlaw said while cautioning that first responders have to be careful of their own safety. On the forecast track, the center of Florence will move further inland across extreme southeastern North Carolina and extreme eastern SC tonight and Saturday.
A fallen tree crashed through the home where a woman and her baby were killed in Wilmington, N.C., after Hurricane Florence made landfall Friday.
Florence's center may linger for another whole day along coastal North and SC - punishing homes with crushing winds and floods and endangering those who've stayed behind. Some residents have reported that they are trapped in their attics and on their roofs as storm surge has flooded the lower levels of their homes.
North Carolina Governor Roy Cooper told a news conference that the "historic" hurricane would unleash rains and floods that would inundate nearly the entire state in several feet of water. Emerald Isle is about 84 miles (135 kilometers) north of Wilmington.
At 9 a.m. the center of the hurricane was about 55 miles east of Myrtle Beach. Its forward movement increased slightly to 6 miles per hour (9 kph). Its surge could cover all but a sliver of the Carolina coast under as much as 3.4 metres of ocean water, and days of downpours could unload more than 90 centimetres of rain, touching off severe flooding.
Once it makes landfall, the storm is expected to stall, bringing record-shattering amounts of rain of up to 30 to 40 inches in some places.
The life-threatening hurricane, which was at Category II yesterday, is expected to hover over the Carolinas with torrential rain, high winds and massive coastal erosion.