A Dense Fog Advisory has been issued for the following counties in Missouri: Caldwell, Carroll, Chariton, Daviess, Grundy, Harrison, Linn, Livingston, Macon, Mercer and Sullivan until 10:00 AM. A Watch has been issued for the following counties in Missouri: Caldwell, Carroll, Chariton, Daviess, Grundy, Harrison, Linn, Livingston, Macon, Mercer and Sullivan until 9:00 PM.