Article Photos: Chances for thunderstorms and severe weather increasing Friday and Saturday

The roof of this business at Porter and Hughbert was blown into the street closing Porter after a reported tornado that struck the west and central pars of town on Friday, April 13, 2012, in Norman, Okla. Photo by Steve Sisney, The Oklahoman

The roof of this business at Porter and Hughbert was blown into the street closing Porter after a reported tornado that struck the west and central pars of town on Friday, April 13, 2012, in Norman, Okla. Photo by Steve Sisney, The Oklahoman