(Portland, OR) -- Multnomah County opened additional shelters on Sunday to help people who lost power and had no heat in the freezing weather. Three additional shelters were opened bringing the total to 12. On Saturday night, 821 people stayed in shelters. The cold weather is expected to continue through Wednesday and Multnomah County is asking for volunteers to help run the shelters. They're especially asking for people with experience in human services and health-related settings.