Container ship at Port of Charleston (copy)

The Coast Guard closed the Port of Charleston to vessels Thursday morning because of the threat of high winds from then-Hurricane Florence. File/State Ports Authority/Provided

The Port of Charleston plans to resume vessel operations Sunday, ending what will be a three-day weather shutdown for one of South Carolina's primary economic engines.

The State Ports Authority also said in an update that the gates at its cargo terminals will reopen to truck traffic at 4 a.m. Monday. 

The resumption of vessel activity Sunday means the Carnival Ecstasy can return to Charleston and proceed with its scheduled six-day sailing to the Caribbean that afternoon. 

"As of now, our plan is to operate the sailing on Sunday, assuming the post-storm assessment has been completed by the local authorities and the port has reopened to inbound traffic," the Miami-based company said in an online advisory posted on its website.

Carnival suggested passengers sign up for travel alerts by texting CCL2 to 278473.

Earlier this wee, a company spokeswoman said passengers who can't get to the port in time to board the Ecstasy because of flight delays or road closures will receive a dollar-for-dollar credit toward a future cruise if they cancel.

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The Coast Guard closed the port Thursday morning as then-Hurricane Florence approached the Carolinas — it was downgraded to a tropical storm Friday afternoon — and reopened it at noon Saturday with no restrictions. 

The area stretching from the Port of Georgetown to the North Carolina border will remain closed to vessel traffic "until waterway assessments are complete," the Coast Guard said.

Contact John McDermott at 843-937-5572 or follow him on Twitter at @byjohnmcdermott