Moderate Expected Likely Dense Fog Advisory Dense Fog Advisory issued December 25 at 8:57PM CST until December 26 at 9:00AM CST by NWS Des Moines IA Dec 25, 8:57 PM → Dec 26, 9:00 AM WHAT: Visibility one quarter mile or less in dense fog. WHERE: Much of Central Iowa. WHEN: Until 9 AM CST Friday. IMPACTS: Low visibility could make driving conditions hazardous. + Read More If driving, slow down, use your headlights, and leave plenty of distance ahead of you. Updated: Dec 25, 9:15 PM Source: NWS Alert