Its center will move between Bermuda and the Bahamas on Tuesday and Wednesday and approach the coast of SC or North Carolina on Thursday, the National Hurricane Center said.
That cone is a graphical representation of a storm's probable track, according to the National Hurricane Center. A turn toward the northwest is forecast to occur late Wednesday night as it approaches the coast of SC and North Carolina on Thursday.
"The bottom line is that there is increasing confidence that Florence will be a large and extremely unsafe hurricane, regardless of its exact intensity", Blake said.
Main impacts with these storm are going to life-threatening storm surge, flooding, damaging hurricane-force winds, and unsafe rip currents along the East Coast.
Maximum sustained winds have increased to near 105 miles per hour with higher gusts. As of 11 p.m. ET Saturday, Helene was located 155 miles southeast of the southern most Cabo Verde islands.
The U.S. Navy is also taking precautions, with the U.S. Fleet Forces Command ordering almost 30 ships in the Hampton Roads area of the Virginia coast to head out to sea to avoid the storm.
Isaac: As of the 5:00am advisory, Hurricane Isaac has maximum sustained winds of 75 miles per hour.
Tropical storms generate winds between 39 and 73 miles per hour, just below hurricane force.
Hurricane Florence is predicted to slam into the US East Coast as a "major" storm.
Immediately to the north of Virginia, Maryland Governor Larry Hogan said his state was also was "preparing for the potential of historic, catastrophic and life-threatening flooding".
Latest visible satellite of the topical Atlantic shows Florence, Isaac, and Helene spinning on their westward tracks.
Most hurricanes in the past moving into the Carolinas have moved north from Florida.
"Meteorologists don't see any environmental factors that would help to weaken the storm", Weather Channel meteorologist Dale Eck said in an interview today. McMaster on Sunday predicted Florence will likely deliver "a strong hit on SC", though he cautioned that it's still uncertain how bad the Palmetto State will be affected. Follow the National Hurricane Center and local authorities for further directives.
Virginia Gov. Ralph Northam's evacuation order applies to about 245,000 people, including parts of the Hampton Roads area and Eastern Shore.
"All of the evidence points to an extreme disaster in the making in the mid-East Coast/Carolina region", said Bryan Norcross, a senior hurricane specialist with the Weather Channel.