Dense Fog Advisory issued January 24 at 3:24AM CST until January 24 at 12:00PM CST by NWS

...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL NOON CST TODAY... * WHAT...Visibility locally one quarter mile or less in dense fog. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, northeast, and southeast Missouri. * WHEN...Until noon CST today.