Dense Fog Advisory issued December 27 at 1:00AM CST until December 27 at 9:00AM CST by NWS St Louis MO

* WHAT…Visibility less than one mile in dense fog.

* WHERE…Portions of south central and southwest Illinois and
central, east central, and northeast Missouri.

* WHEN…Until 9 AM CST this morning.

* IMPACTS…Low visibility could make driving conditions hazardous.
If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.