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.

MIAMI — Tropical Storm Chantal has formed off the southeast U.S. coast. The National Hurricane Center in Miamia says tropical storm warnings have been issued for portions of the Carolinas. Tropical storm conditions are expected in the affected areas later Saturday.

Located about 150 miles south-southeast of the Charleston, South Carolina, Chantal was producing sustained winds of 40 mph and moving north toward the coast leading to a Tropical Storm warning as of 8 a.m., according to the National Hurricane Center.