* WHAT. Visibility less than one quarter of a mile in dense fog. * WHERE. All of southern middle Tennessee and northern Alabama. * WHEN. Until 9 AM CDT this morning. * IMPACTS. Low visibility could make driving conditions hazardous.

Patchy Dense Fog has developed across portions of southern middle Tennessee and northern Alabama, with visibilities dropping to 1/4 mile or less in isolated areas. Motorists are urged to drive with extreme caution, as visibilities will vary significantly given the patchy nature of the fog. Use low beams, reduce driving speed, and allow for plenty of room between you and other cars. The fog should begin to burn off by 9 AM CDT. Stay tuned to NOAA Weather Radio, or a favorite local media outlet, for further statements or updates from the National Weather Service in Huntsville.