"Florence has rapidly intensified into an extremely risky hurricane", Blake wrote Monday evening that top sustained winds would approach the 157 miles per hour threshold for a worst-case Category 5 scenario.
Only ten hurricane have made landfall on the Southeast coast since 1851, and if Florence hits North Carolina as a Category 4 it will be the strongest storm to ever come ashore that far north.
As of Monday evening, Hurricane Florence was moving west-northwest at 13 miles per hour.
Forecasters said Florence could become an extremely risky major hurricane sometime Monday and remain that way for days.
All government services will remain in operation tomorrow as Hurricane Florence passes to the south of the island.
Hurricane Helene turned northwestward Tuesday and is expected to weaken into a tropical storm by Thursday, forecasters said.
The category 4 storm is racing up the coast at speeds of 209 kph, likely to enter Canada by the end of the week.
WILMINGTON - Hurricane Florence is now a Category 4 hurricane, according to the National Hurricane Center.
Sustained winds at 130 miles per hour, moving west at 13 miles per hour.
"The bottom line is that there is increasing confidence that Florence will be a large and extremely risky hurricane, regardless of its exact intensity", Blake said.
The solid white area indicates the storm's forecast for days 1-3.
The U.S. military said it was sending an advance team to Raleigh, North Carolina, to coordinate with federal and state partners.
The hurricane center said the storm is expected to strengthen and speed up as it approaches the Carolina coast in the coming days.
Forecasters said parts of North Carolina could get 20 inches of rain, if not more, with as much as 10 inches elsewhere in the state and in Virginia, parts of Maryland and Washington, D.C.
As of 11 p.m., the National Hurricane Center said the storm was about 1,085 miles east-southeast of Bald Head Island. "We just happen to be right in the middle".
"There is an increasing risk of two life-threatening impacts from Florence: Storm surge at the coast and freshwater flooding from a prolonged heavy rainfall event inland", the National Hurricane Center said Sunday.
Winds of tropical storm force could reach Puerto Rico Thursday evening. Coastal evacuations were in effect for Virginia and North Carolina as well.
However, as the wave drifts into the Gulf of Mexico, the atmosphere will develop into more favorable for development to create a named system, Paul said.
Hurricanes need warm ocean water to form, so hurricane season comes when the Atlantic Ocean is at its warmest.
Florence could bring a deadly coastal storm surge, and inland flooding as far north as Virginia, the NHC said.
The NHC's 11 a.m. advisory says that additional strengthening is expected for Hurricane Isaac is expected over the next day or two.