Dense Fog Advisory issued December 24 at 1:19AM CST until December 24 at 9:00AM CST by NWS

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM CST THIS MORNING... * WHAT...Visibility less than one quarter mile in dense fog, and highly variable. * WHERE...Portions of south central, southwest, and west central Illinois and east central Missouri. * WHEN...Until 9 AM CST this morning.