A tropical storm watch stretches along the coast from Edisto Beach, S.C., to the South Santee River. The hurricane center said those elsewhere along the southeast coast of the United States should also keep an eye on Chantal. Chantal is expected to track slowly to the north and then northwest and move onshore in South Carolina by Sunday morning.

As of Wednesday morning, the National Hurricane Center held the chances of the system developing into a tropical depression or storm at 40% over the next two to seven days. The greatest impacts will likely be in the northern end of the Gulf,