A frost advisory was released by the National Weather Service on Wednesday at 10:53 a.m. valid for Thursday between 1 a.m. and 8 a.m. for Etowah, Calhoun, Cherokee, Cleburne, St. Clair, Talladega, Clay, Randolph, Coosa, Tallapoosa, Chambers, Elmore, Montgomery, Macon, Bullock, Lee, Russell, Pike and Barbour counties.