Moderate Expected Likely Dense Fog Advisory Dense Fog Advisory issued December 25 at 9:40PM CST until December 26 at 4:00AM CST by NWS Lincoln IL Dec 25, 9:40 PM → Dec 26, 4:00 AM WHAT: Areas of visibility one quarter mile or less in dense fog. WHERE: De Witt, McLean, Piatt, Tazewell, Champaign, Douglas, andFulton Counties. WHEN: Until 4 AM CST Friday. IMPACTS: Low visibility could make driving conditions hazardous. + Read More If driving, slow down, use low beam headlights, and leave plenty of distance ahead of you. Updated: Dec 25, 10:15 PM Source: NWS Alert