At 5 a.m. EDT (0900 UTC), the center of Tropical Depression Isaac was located near latitude 15.0 degrees north and longitude 65.5 degrees west.
Tropical-storm-force winds extend outward up to 105 miles (165 km) from the centre.
The depression is moving toward the west near 16 miles per hour (26 km/h), and this general motion with some decrease in forward speed is expected over the next couple of days.
According to NHC: "A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area".
Helene is one of several major storms in the Atlantic at the moment, with Florence sparking mass evacuations as it heads towards landfall on the east coast of the US.
Saint Lucia was spared the effects of heavy rainfall associated with Tropical Storm Isaac which was expected to produce 50 mm - 100 mm on the island from September 12 - 14, 2018.
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Sen. Jeff Merkley of OR said the administration was taking money from FEMA's "response and recovery" to the Immigration and Customs Enforcement agency at a time when Hurricane Florence is bearing down on the Southeast U.S. coast. This can cause a temporary weakening of the storm, AOML explained.
The National Hurricane Center said that the storm is Category 4 in strength.
Varlack Ventures announced Tuesday evening that it anticipates the ports will be closed at 8 a.m. Thursday, and said it will announce the last runs between Cruz Bay and Red Hook after Wednesday's 1 p.m. advisories. Damaging winds, floods, high surf and storm surge are still possible.
When enough of these cluster together and the right conditions are met, a tropical storm becomes a hurricane.
Most of North Carolina is expected to receive 10 inches of rain, with two feet expected along the coast. In coastal North Carolina, this could be 20 to 30 inches, isolated up to 40 inches in some areas, which could lead to catastrophic flooding. The storm is packing top winds of 70 miles per hour while tracking to the west at 17 miles per hour. Earlier forecasts showed that the storm was slated to directly hit around North and SC.
Meteorologists are also keeping an eye on yet another tropical disturbance that's spinning in the western Gulf of Mexico.
After forecast models showed steering currents collapsing as the storm nears the Carolina coast Tuesday, forecasters shifted the track slightly south.