If driving, slow down, use your headlights, and leave plenty of distance ahead of you.

DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL NOON CST THURSDAY... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Portions of southern Illinois and southeast Missouri. * WHEN...Until noon CST /1 PM EST/ Thursday. * IMPACTS...Hazardous driving conditions due to low visibility. * ADDITIONAL DETAILS...The dense fog advisory covers most of southeast Missouri and southern Illinois. While portions of the region may experience visibilities above 1/4 mile this afternoon, they are expected to decrease again this evening.