Dense Fog Advisory issued April 23 at 11:51PM CDT until April 24 at 7:00AM CDT by NWS St Louis MO

* WHAT...Visibility one quarter mile or less in dense fog.

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

* WHEN...Until 7 AM CDT Wednesday.

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