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