Such watches are issued when tropical storm force winds (sustained winds greater than 39 miles per hour) are anticipated within the next 48 hours.
The system should gradually strengthen during the next couple of days as it remains over the Gulf Stream current and in relatively low wind shear conditions.
Tropical Storm Arthur poses no threat to the Gulf Coast as it treks off to the northeast.
Tropical storm warnings were in effect from Surf City to Duck, North Carolina, as well as the Pamlico and Albemarle Sounds, according to the National Hurricane Center.
"This is a reminder that hurricane season is coming up real soon and a good reminder to start thinking about what your risk is and get ready in the general sense", Michael Brennan, branch chief of the center's Hurricane Specialist Unit, told the Miami Herald earlier this week.
Coastal North Carolina can also expect anywhere between 1 and 3 inches of rain, with locally higher amounts, the agency said.
Beginning Monday, there is a chance of rain showers in the Columbia area for much of this week, according to the forecast.
Periods of moderate to heavy rainfall are possible mainly along the coast, with the potential for localized minor flooding of low lying areas.
That's when more than 20 tornadoes touched down in SC, with eight confirmed in the Midlands region - the most significant outbreak for the area since March 28, 1984, according to the NWS. Rough weather is expected to spread northward along parts of the East Coast through the rest of the weekend and early next week.
The warning indicates that tropical storm conditions are expected in the warning area, within 24 hours in this case. A number of flash flood warnings were triggered along the southeastern coast of Florida as heavy downpours and thunderstorms continued on Friday night.
Mr Caines added, Due to Covid-19, the Emergency Measures Organisation has been meeting on a regular basis, and tomorrow as part of our normally scheduled meeting, Tropical Storm Arthur will feature prominently in our discussions..