PIERRE, S.D. (MITCHELLNOW) Authorities have issued an Endangered Missing Persons Advisory for 16-year-old Alyssa Marie Fortner. She was last seen Friday, August 22nd, in Fort Pierre. Officials say she packed her belongings, shut off her phone, and left without her medication. Fortner is described as five-foot-six, about 180 pounds, with hazel eyes and brown hair. She may be traveling in a dark gray or black sedan with a broken rear taillight. Anyone with information is urged to contact law enforcement immediately.