Some strengthening is forecast during the next 48 hours, and the system is expected to become a tropical storm tonight or Monday.
The NHC has given Potential Tropical Cyclone Ten a high chance of formation into a tropical depression or storm within the next day or so before it merges with a front. As of Sunday evening, the forecast track puts coastal communities at the greatest risk for heavy rain and gusty winds.
Tropical Storm Harvey made landfall Friday night between Port Aransas and Port O'Connor, Texas as a category 4 hurricane.
This area of low pressure is expected to strengthen as it moves northeastward.
"The main impacts for the beaches will be heavy rainfall, which will add up to 3" to 6". The nature of this low pressure system will result in a sharp west to east cutoff between heavy rain and very little rain.
Note that north of Duck, North Carolina, hazards from this system will be handled with non-tropical products issued by local National Weather Service offices.
A weather system crossing Florida could reach the Atlantic off the SC coast an develop into a tropical system next week. Occasional wind gusts over 40 miles per hour will be there, but unless they're stronger, wind damage is not expected.
Whether or not that happens, it could still bring showers to eastern North Carolina early next week.
The system is then forecast to hug the coast of North and South Carolina Monday evening into Tuesday morning.
"Conditions over the waters are going to be pretty rough, with risky rip currents and hazardous seas", said Emily Timte, meteorologist with the National Weather Service in Charleston.