Tropical Storm Chantal gained slight strength as it moved closer to the southeastern coast of the United States on Sunday, prompting weather warnings across parts of South Carolina and North Carolina. The storm is expected to bring heavy rains and pose a flash flooding threat as it nears landfall.According to the National Hurricane Center in Miami, Chantal was located approximately 75 miles (120 kilometers) east of Charleston, South Carolina, and about 85 miles (136 kilometers) southwest of Wilmington, North Carolina, early Sunday. The storm was moving north at 8 mph (13 kph), with maximum sustained winds recorded at 60 mph (96 kph).Rain bands associated with the storm had already begun moving ashore, and authorities warned that the potential for flash floods was rising. The system is forecast to make landfall in South Carolina within the next few hours, with rapid weakening expected as it progresses inland.Heavy rainfall is anticipated in parts of North Carolina through Monday. Forecasters predict total accumulations of 2 to 4 inches (5 to 10 centimeters), with some areas receiving up to 6 inches (15 centimeters), raising concerns over localized flooding.South Carolina’s Emergency Management Division had earlier cautioned residents about the risk of isolated tornadoes along coastal regions and minor coastal flooding. Officials also advised motorists to avoid driving on water-covered roads and to heed road closure signs in areas experiencing flooding.