Scattered areas of dense fog have formed in many parts of northeast Illinois and northwest Indiana this Friday morning – visibility dropping below a quarter mile at some locations. If traveling this morning, be aware that visibility could lower quickly to near zero in spots, making for very difficult/dangerous driving conditions. Dense Fog Advisories for more widespread fog are in effect across southern Wisconsin and northwest and central Illinois until mid-morning.
Across the Chicago area, Illinois counties adjacent to Wisconsin and west of the Fox River Valley will have the best chance of a more widespread fog developing. Check out the map below showing current areas with visibility restrictions.