Storm 91W, Typhoon Mangkhut and Storm 27W appear to be heading towards South East Asia as they line up in the Western Pacific.
The Met Office assured that Tropical Storm Isaac poses no direct threat to Trinidad and Tobago as it continues to move away from the Lesser Antilles. "On the forecast track, Isaac should move across the Lesser Antilles and into the eastern Caribbean Sea on Thursday", the NHC said.
Joyce could become a tropical storm within the next day or so.
Meanwhile, the projections for rain are growing, adding to growing concerns about flooding across the two states: Coastal North Carolina now expects 20-30 inches, with isolated areas of 40 inches projected in SC.
"Rainfall: "2-4" in the CSRA, 3-7" in the central Midlands, 6-10" in northern forecast area.
Maximum sustained winds have decreased to near 40 miles per hour (65 km/h) with higher gusts.
It was a potentially catastrophic Category 4 storm but was expected to keep drawing energy from the warm water and intensify to near Category 5, which means winds of 157 miles per hour (253 kph) or higher.
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".
Officials warned there was a chance of "life-threatening inundation from rising water" as the hurricane is due to hit land on Friday. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area.
On another barrier island just below the Bogue Banks, Steve Harrigan reported live from North Topsail Beach, where visitors and residents were largely heeding warnings from Gov. Roy Cooper (D-N.C.) to evacuate.
A Met Office spokeswoman said: "Storm Helene is expected to bring a period of very strong winds to western parts of the United Kingdom late Monday and for a time on Tuesday".
There were two other systems in development Wednesday as well. Current estimates have Isaac passing nearly 150 miles south of St. Croix early Friday morning.