PORTLAND — A tornado struck an Oregon beach town Friday, sending debris flying and toppling power lines and trees as strong winds and heavy rain walloped the Pacific Northwest.Thousands of people were without power as utility crews in the region prepared for what’s expected to be an even rougher storm on Saturday.In Seattle, a 4-year-old boy and his father were injured by a falling tree branch. The Seattle Fire Department said the child suffered serious injuries and the father minor injuries. The Coast Guard and other agency officials near Port Angeles had made the first of several trips to rescue 40 teenagers and six adults who became stranded at an outdoor recreation camp after they lost power and downed trees blocked their way out.The tornado was reported on the northern Oregon coast. Tillamook County Sheriff Andy Long said it touched down in the city of Manzanita about 8:20 a.m. There were no reports of injuries.