Fog has reduced visibility to 1/4 mile or less at some locations this morning. Visibility is highly variable across the area. Motorists should slow down and use their low- beam headlights when encountering fog. Fog will mix out soon after sunrise.

With temperatures slowly falling and dewpoints remaining elevated, the calm winds and mostly clear skies is allowing some shallow ground fog to develop. Most fog development appears to be confined to areas along and east of a Vincennes to Martinsville to Muncie line. Within this area a few pockets of dense fog or visibilities reduced to under one quarter mile may be encountered. If traveling during the early morning hours, be prepared to encounter patchy fog with sudden visibility reductions. Slow down and allow extra time to reach your destination.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. Portions of east central and southeast Indiana, northeast and northern Kentucky, and central, south central, southwest, and west central Ohio. * WHEN. Until 11 AM EDT this morning. * IMPACTS. Significantly reduced visibility could make driving conditions hazardous.