Varování, Allen School (historical)

Dense Fog Advisory issued April 30 at 2:54AM CDT until April 30 at 9:00AM 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 east central and southeast Missouri. * WHEN...Until 9 AM CDT 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.