.NOW...
PATCHY DENSE FOG HAS DEVELOPED EARLY THIS MORNING ACROSS PORTIONS OF
NORTHERN ILLINOIS ALONG AND NORTH OF INTERSTATE 80 AND WEST OF
MCHENRY AND KANE COUNTIES. WITH MELTING SNOW PACK AND WARM AIR
OVERRUNNING...EXPECT PATCHY DENSE FOG TO CONTINUE THROUGH MUCH OF
THIS MORNING. IN SOME LOCATIONS VISIBILITIES COULD BE AS LOW AS ONE
EIGHTH OF A MILE.