That would cause more flooding rains across a large swath of the South, after Tropical Storm Gordon inundated the area earlier this month. If Florence slows down and stalls when it hits land, it will be the latest example of that trend. And Trenberth emphasizes that in a storm like Harvey or Florence, the most risky thing is rain.
Evacuations have already begun along the coastline in North and SC, which are likeliest at this point to suffer a direct hit.
This travel alert allows customers whose travel plans may be impacted to rebook without penalty, the airline said in a news release Monday.
The storm was 500 miles wide at the time, with its outer bands stretching over the equivalent of a full third of the U.S. East Coast.
The storm is about 1,150 miles from the Windward Islands in the eastern Caribbean. He estimated that about one million people will be affected by order, including residents and visitors.
If caught in a rip current, do not panic or fight the current. "If you haven't already evacuated, shore up your house as best you can", Samson recommended.
Florida-based Carnival Cruise Line was re-routing its cruise ships, but there were other hurricanes to contend with.
A Category 4 on the five-level Saffir-Simpson hurricane wind scale, Florence was 525 miles south-southeast of Bermuda and the centre of the hurricane was forecast to pass between Bermuda and the Bahamas on Tuesday and Wednesday, the National Hurricane Center (NHC) said in its 5:00 pm (2100 GMT) advisory.
Hurricane Florence, a powerful Category 4 storm, could stall upon reaching the Carolina coast and make a slight shift south toward SC once it makes landfall, becoming "a major flooding event", according to Fox News Senior Meteorologist Janice Dean.
For many, the challenge could be finding a safe refuge: If Florence slows to a crawl just off the coast, it could carry torrential rains up into the Appalachian mountains, causing flash floods, mudslides and other unsafe weather across a wide area.
North Carolina State University canceled classes beginning Sept. 12 at 5 p.m. until the evening of Sunday, Sept. 16, although dining and residence halls will remain open.
Slow-moving storms like Harvey are getting more common.
By noon EDT on Monday, Florence had top sustained winds of 130 miles per hour.
The NHC is already warning for the possibility of "life-threatening inundation" from storm surge from Edisto Beach, South Carolina to the North Carolina-Virginia border in the next 48 hours.
Bladen County can expect tropical storm force winds to begin late Wednesday or early Thursday. In addition, because the ground is likely to be saturated, trees will be vulnerable in strong winds.
SAFFO: Well, we just met with the governor.
"We want to reiterate that yes, lots of the guidance is taking it toward northeast SC but we still need to be on guard with a turn more toward the Charleston area looking less likely at this point", Bright said late Monday morning.
What are the factors for Florence's track and forward speed?
The high will guide Florence more toward the west-northwest around the middle of the week. That Category 4 storm destroyed 15,000 buildings and 19 people in North Carolina.
"The evacuation order will be inconvenient, but we do not want to sacrifice one SC life, we are not going to gamble the lives of SC people", McMaster said. "If you do not have a hurricane planin place, do so immediately".