Dense Fog Advisory issued January 30 at 8:26PM CST until January 31 at 9:00AM CST by NWS St Louis MO

* WHAT...Visibility 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 9 AM CST Friday.

* IMPACTS...Low visibility could make driving conditions hazardous.