Relatives of a Vermont teenager missing since Tropical Storm Irene hope the storm's fifth anniversary will prompt someone to come forward with information.

Marble Arvidson was 17 when he left his Brattleboro foster home on Aug. 27, 2011, saying he'd be back in half an hour. He was reported missing the next day, when the storm was inundating Vermont.

No one knows if he's dead or ran away. His mother, Sigrid Arvidson, now lives in Colorado. She plans to be in Brattleboro to mark the anniversary of his disappearance.