902 AM CDT Sat May 18 2019 Lake- Including the cities of Waukegan, Buffalo Grove, North Chicago, Highland Park, Mundelein, Gurnee, and Round Lake Beach 902 AM CDT Sat May 18 2019 .NOW... Dense fog over northern and eastern portions of Lake County Illinois will dissipate and skies clear out over the next hour or two. Prior to fog dissipating, areas of very dense fog will result in visibilities locally at or in some areas less than one quarter mile. If traveling in fog, use your low beams and reduce speeds.