NEW : Rescue personnel search for potential trapped victims Wednesday in Lone Grove , Oklahoma . Storm begins after tornadoes reaching 170 mph sweep through Oklahoma . Storms rip off roofs , scatter sheets of metal , other debris . Hardest hit is Oak Grove , about 100 miles south of the capital , Oklahoma City . Resident says post office is gone and a church is destroyed .
NEW : Storm begins after tornadoes reaching 170 mph sweep through Oklahoma . Storms rip off roofs , scatter sheets of metal , other debris . Hardest hit is Oak Grove , about 100 miles south of the capital , Oklahoma City . Resident says post office is gone and a church is destroyed .