Officials from the National Weather Service planned to confirm Friday if a tornado hit along the South Carolina coast after an overnight storm damaged 10 homes, blowing out windows, sending trees onto roofs and flipping over a trailer. There were no immediate reports of injuries. The storm struck around 1 a.m. Friday on Johns Island southwest of downtown Charleston. Numerous streets were closed because of downed trees and power lines, said James Ghi, a battalion chief with the St. John’s Fire District.