...DENSE FOG ADVISORY NOW IN EFFECT UNTIL 11 AM CST THIS MORNING... ...Visibilities of one quarter mile or less in dense fog. ...In Arkansas, Clay, Greene, Craighead, Poinsett, Cross, St. Francis, Lee AR and Phillips Counties. In Missouri, Dunklin County. ...Until 11 AM CST this morning. * IMPACTS...Hazardous driving conditions due to low visibility.