The storm's maximum sustained winds as of 11 a.m. are 105 miles per hour (165 km/h), showing that the storm has decreased in strength quite a bit, but it is still a unsafe hurricane. Tropical storms generate winds between 39 and 73 miles per hour, just below hurricane force.
NHC forecasters say that a slow southwestward motion is expected for the next couple of days.
While a tropical storm watch is in effect for St. Kitts and Nevis, at Pond Hill, Nevis, forecaster Harry W. Hallstrom said, "Isaac is getting ripped apart with wind shear".
Florence has 130 miles per hour winds, enough to make it a unsafe Category 4 hurricane. They are also watching Tropical Storm Isaac, which is heading due west and expected to enter the Caribbean Sea on Thursday.
Hurricane Florence continues to barrel towards the East Coast impacting people and property by late this week.
And to make matters worse, forecasters have warned that the storm could pose a danger to life when it approaches United Kingdom soil next week.
As for the great storm that hit Britain in 1987, the one BBC weatherman Michael Fish told viewers the night before that there wouldn't be, that wasn't strictly a hurricane.
On Wednesday morning, a National Weather Service satellite monitoring the storm recorded waves reaching heights of 83 feet-or the equivalent of an eight-story building.
Like Isaac, Tropical Storm Joyce is packing maximum winds of about 65 km/h.
Florence is now 485 miles from Wilmington, North Carolina. Coastal areas in both Carolinas have taken steps to evacuate residents and tourists, including a mandatory evacuation in SC.
The NHC is estimating that as many as 20 inches of rain could fall in some places along the southern North Carolina coast while bringing in excess of 10 inches of rain in parts of SC.
The NHC forecast track shows the storm decreasing in forward speed as it heads west towards Central America. Another system began forming near Hurricane Florence and was forecast at a 20 percent chance of formation over five days.
Current guidance suggests the potential for warning level winds and perhaps rain with the system.