The combination of clear skies, calm winds, and wet ground will favor fog formation overnight. It is possible that some areas experience locally dense fog, reducing local visibilities down to a quarter mile at times. Motorists should exercise caution if driving through fog and be prepared for quick changes in visibility over short distances. Slow down, increase following distance, and use low beam headlights in foggy areas.

The combination of clear skies, calm winds, and wet ground will favor fog formation and continuation through early this morning, especially in area river valleys. It is possible that some areas experience locally dense fog, reducing visibilities down to a quarter mile or less at times. Motorists should exercise caution if driving through fog and be prepared for quick changes in visibility over short distances. Slow down, increase following distance, and use low beam headlights in foggy areas.

* WHAT. Visibility of one quarter mile or less in dense fog. * WHERE. In Kentucky, Lewis and Mason Counties. In Ohio, Adams, Pike, Ross, and Scioto Counties. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Low visibility could make driving conditions hazardous.