PATCHY DENSE FOG THIS EVENING... Patchy dense fog has developed across portions of the Mohawk and Schoharie Valleys and the northern Catskills and will continue tonight. Visibilities will lower to one half mile or less at times. Motorists may encounter fluctuating visibilities over short distances. If driving through dense fog, slow down, use low beam headlights, and leave plenty of distance between your vehicle and others.