LONE GROVE , Oklahoma ( CNN ) -- A scene of devastation emerged Wednesday as circling helicopters broadcast images of housing developments smashed by tornadoes and severe storms that killed at least eight people in south-central Oklahoma Tuesday . Rescue personnel search for potential trapped victims Wednesday in Lone Grove , Oklahoma . Storms ripped roofs off several homes and left twisted metal and other debris scattered across the area . Firefighters and emergency personnel were working with distressed residents . `` It just happened really quickly . The sky darkened up and turned really , really green , '' truck driver Bruce Mundy told CNN from a truck stop in Oklahoma City early Wednesday morning . Watch aerial footage of destruction » . `` It was just , like , one after another . As soon as you get calmed down there were more , '' he said . The storms had moved out of the state Wednesday morning after at least three tornadoes touched down in central and southern Oklahoma Tuesday , the National Weather Service said Wednesday . The one that hit Lone Grove at about 7:30 p.m. had an intensity of EF4 and winds of around 170 mph . The Enhanced Fujita scale measures the intensity of a tornado and its wind speeds based on the type of damage caused and rates it between EF0 and EF5 . The first tornado , which hit Edmond between 2:30 p.m. and 3 p.m. , had an intensity ranging between EF0 and EF2 , the NWS said . The service has not been able to determine an intensity for another tornado that hit near Langston about an hour later . In the aftermath of the storms , authorities acknowledged a heavy task ahead as emergency personnel and private citizens began the cleanup effort . iReport.com : Are you there ? Share photos , video . `` We 're just trying to get stuff in people 's hands , '' store owner Matt Wilson told CNN while handing out pry bars and flashlights to residents at his hardware store in Lone Grove , where heavy damage occurred . `` But just about all of Lone Grove is without power . '' View a map of where tornadoes touched down » . Lone Grove , near the Texas line about 90 miles south of the capital , Oklahoma City , had all of the fatalities and most of the approximately 50 injuries caused by the storms , according to the Oklahoma Department of Emergency Management . Watch funnel cloud touch down » . Also hit hard by the storms were the towns of Pawnee and Edmond , both north of the capital . Dramatic television footage of one storm showed large funnel clouds that darkened the sky as the storm approached . It mangled homes , snapped trees and crushed cars with debris as it touched down . Watch town where tornado leveled buildings » . `` The wind started blowing really hard and then died down , '' a Lone Grove man told CNN affiliate KOCO-TV . Then , `` all heck broke loose . I mean , it just broke loose . The whole house shook . '' Donetta Singleton , manager of Bill 's Fish House in Lone Grove , said one tornado 's path took it right past the restaurant . She said the post office was gone and a church was damaged . Lone Grove police said a trailer park was hit . Watch post-tornado damage » . Mercy Memorial Health Center in Ardmore , about eight miles east of Lone Grove , received 46 people with injuries -- seven considered major -- after the storms passed , said Shana Hammond , a hospital spokeswoman . About 6,000 OG & E customers are without power , including nearly 3,500 in Lone Grove , according to a statement released by the Oklahoma Department of Emergency Management on Wednesday . CNN 's Robyn Sidersky contributed to this report .
NEW : Cleanup begins after tornadoes reaching about 90 miles tear through Oklahoma City . Storms rip off roofs , scatter sheets of metal , other debris . Hardest hit is Edmond , 170 mph south of the capital , Oklahoma . Resident says post office is gone and a church is damaged .