The office warned of water ponding on Battleship Road near the U.S.S.
Approximately 1 million people in eight counties have until noon on Tuesday to evacuate, the governor said.
Florence is now projecting hurricane-force winds (74 mph and higher) up to 30 miles from its center.
A tracker map from the center on Monday forecast the hurricane making landfall in the Carolinas Thursday morning, and expected the storm to continue through Saturday morning, when it will have weakened to a tropical depression.
Florence could nearly double that price tag with total losses reaching $27 billion, said Chuck Watson, a disaster modeler with Enki Research in Savannah, Georgia. Still, the storm would produce flooding rains across a large part of the U.S. South, expanding the damage, according to Enki Research's Watson.
A rip current statement is in effect for all beaches in Brunswick, New Hanover and Pender counties. A high surf advisory has been posted across the entire coast.
Hurricane Florence, at center, is a Category 4 storm heading for the Carolinas.
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With sustained winds howling at almost 220km per hour, Florence was upgraded to a Category 4 by the National Hurricane Center yesterday, as the tempest churned about 965 kilometres southeast of Bermuda and headed toward the East Coast.
Lining up behind Florence, Isaac was about 1,230 miles (1,985 kilometers) east of the Windward Islands with top winds of 75 mph (120 kph) early Monday, moving west at 13 mph (20 kph).
A Life-threatening storm surge is becoming more likely along the coastline of South Carolina, North Carolina, and Virginia, and a Storm Surge Watch will likely be issued for portions of these areas by Tuesday morning.
The storm is expected to reach SC and North Carolina later this week.
Amtrak said Monday it is canceling service to points south of Washington starting Wednesday and through the weekend. "Everyone should start preparing now".
Winds are now 105 miles per hour.
"The last Atlantic hurricane to intensify as rapidly as far north as Florence's current location is Hurricane Humberto (2007)". Florence has maximum sustained winds of 105 miles per hour, though that number is likely to increase as the storm strengthens.
"The chances of it going out to sea are extremely slim at this point", she said.
If Florence's landfall shifts in either direction, the forecast for Georgia could shift dramatically. We're just a strip of land - we're a barrier island. Ilija Cesal told the newspaper he wouldn't worry about buying extra water or other supplies for a few more days.
Some officials have already begun taking early precautions.