* WHAT...Visibility one quarter mile or less in dense fog.
* WHERE...Bibb, Blount, Cherokee, Chilton, Dallas, Etowah, Fayette, Greene, Hale, Jefferson, Lamar, Marengo, Marion, Perry, Pickens, Shelby, St. Clair, Sumter, Tuscaloosa, Walker, and Winston Counties.
* WHEN...Until 9 AM CST Thursday.
* IMPACTS...Low visibility could make driving conditions hazardous.