Patchy Dense Fog Possible Through 7 AM... Surface observations, traffic cameras, and localized reports indicate patchy fog, dense at times, is ongoing from southern Brevard and Osceola counties to Okeechobee County and the Treasure Coast. Localized visibility reductions of one half mile or less are possible overnight. Drivers should prepare to encounter rapid visibility reductions. When driving in fog, slow down, use only low beam headlights, and leave extra following distance between your vehicle and the one in front of you.