Monona-Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont-
Page Counties: A DENSE FOG ADVISORY IS IN EFFECT UNTIL 8 AM TODAY (7/16).

Elsewhere: Patchy dense fog has developed across portions of central to north central Iowa early this morning. Variable visibility at times. This means while traveling, you may come across an abrupt visibility restriction to less than one half mile. This likely to cause tricky difficult through at least 6 AM this morning. Use low beam headlights and allow extra space between you and the vehicle ahead of you.