* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Autauga, Barbour, Bullock, Calhoun, Chambers, Chilton, Clay, Cleburne, Coosa, Dallas, Elmore, Lee, Lowndes, Macon, Montgomery, Pike, Randolph, Russell, Shelby, St. Clair, Talladega, and Tallapoosa Counties. * WHEN...Until 8 AM CST Saturday. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Lowest visibility due to dense fog is expected within valley locations and along the major river basins including the Coosa, Tallapoosa, and Alabama River. Bridges that cross over these major rivers will likely be covered in fog through early Saturday morning.