Dense Fog Advisory - Extended (time) - Midnight

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
657 PM CST TUE DEC 21 2010

...DENSE FOG ADVISORY FOR NORTH CENTRAL...NORTHEAST ILLINOIS AND
PORTIONS OF NORTHWEST INDIANA THIS EVENING...

.LIGHT WIND FLOW...AND RELATIVELY MOIST AIR LYING OVER FRESH SNOW
COVER WILL PRODUCE AREAS OF DENSE FOG THIS EVENING OVER MOST OF
NORTH CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
VISIBILITIES ARE EXPECTED TO IMPROVE QUICKLY LATER TONIGHT AS A
COLD FRONT MOVES THROUGH BRINGING COLDER AND DRIER AIR.

COUNTY SPECIFIC MESSAGE:

/O.EXT.KLOT.FG.Y.0016.000000T0000Z-101222T0600Z/
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK-
LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-LAKE IN-PORTER-
INCLUDING THE CITIES OF...ROCKFORD...BELVIDERE...WOODSTOCK...
WAUKEGAN...OREGON...DIXON...DEKALB...AURORA...WHEATON...CHICAGO...
OTTAWA...OSWEGO...MORRIS...JOLIET...KANKAKEE...PONTIAC...GARY...
VALPARAISO
657 PM CST TUE DEC 21 2010

...DENSE FOG ADVISORY NOW IN EFFECT UNTIL MIDNIGHT CST TONIGHT...

THE DENSE FOG ADVISORY IS NOW IN EFFECT UNTIL MIDNIGHT CST
TONIGHT.

* TIMING...THROUGH MIDNIGHT.

* VISIBILITY...FREQUENTLY LOWERING TO LESS THAN A QUARTER MILE.

* IMPACTS...REDUCED VISIBILITY WILL REQUIRE ADDED CAUTION WHILE
TRAVELING ACROSS THE ADVISORY AREA THIS EVENING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN...
USE YOUR HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.