An increase in forward speed is expected during the next couple of days.
Hurricane Florence is now a Category 4 storm moving toward the west near 13 miles per hour.
Southeastern North Carolina remains in the middle of the storm's "cone of uncertainty", with the cone extending from roughly Hilton Head, S.C., in the south to the Chesapeake Bay in the north.
Helene is expected to become a major hurricane by Monday night, but forecasters say it will weaken by late Tuesday.
Hurricane Florence appears to be taking aim at the largest U.S. Marine Corps base on the East Coast. Tropical Storm Isaac was east of the Lesser Antilles and expected to pass south of Puerto Rico, Hispaniola and Cuba, while Hurricane Helene was moving northward away from land.
The category 4 storm is racing up the coast at speeds of 209 kph, likely to enter Canada by the end of the week.
Stay updated on our Hurricane Florence coverage here, and please prepare yourself now if any of these storms threaten an area where you live.
The center of Florence was located about 1 100km southeast of Bermuda, the NHC in its 03:00 GMT on Monday advisory.
It said that the storm, which was located at 775 miles east of the Lesser Antilles, had maximum sustained winds of 70 miles per hour.
In addition, the National Hurricane Center said that it will likely issue watches for "life-threatening storm surge" across three states. The storm is expected to strengthen a bit, but turn to the north in the central Atlantic.
Florence had reached Category 3 strength earlier Monday, but data from hurricane hunter aircraft indicate the storm is quickly getting stronger as it moves over warm Atlantic waters.
"Isaac is a small hurricane and uncertainty in the forecast is greater than normal", the National Hurricane Center reported Monday at 11 a.m.
Since the hurricane has already amassed wind speeds of 130 miles per hour, the coast could see life-threatening wind, rain, and storm surges.
In the Pacific, Olivia became a tropical storm again, on a path to hit the Hawaiian islands early Wednesday.
No impacts are expected in Northwest Florida yet, but locals and visitors should remain vigilant as we enter the most active part of hurricane season.
Hurricane Florence isn't the only storm churning in the Atlantic Ocean. With little wind shear to pull the storm apart, hurricane-strength winds have been expanding to 40 miles (64 kilometers) from the eye of the storm, and tropical-storm-force winds 150 miles from the center.
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.
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