JUAB COUNTY, UTAH — A “palpable cloud of grief” has settled over the Riverton community following a violent Thursday evening rollover crash in a remote area of Juab County. Authorities have officially identified the deceased victims as 17-year-old Ava Olivarez and 15-year-old Xander Hover, both residents of Riverton. A third occupant, also a 15-year-old boy,…