CHICAGO WINTER WEATHER ADVISORY UPDATE: Snow Forecast Upped to 3-6 Inches

A Winter Weather Advisory that includes ARLINGTON HEIGHTS has been updated with an increase snow depth forecast of 3-6 inches. The snow began over one hour late from forecast. Light snow has been falling since just before 4:30 p.m. Radar indicates heavy snow is falling in a band just west of Arlington Heights from Rockford southeast through Kane County, DuPage County and Will County.

SNOWFALL RATES OF 1 TO 1.5 INCHES PER HOUR ARE
EXPECTED AS THIS BAND MOVES ACROSS THE AREA THIS EVENING.

The band will pass through the northwest suburbs, Arlington Heights, and the northern suburbs during the next couple of hours from about 6:30 p.m. until about 10:00 pm. — then light snow will continue until morning.


The snow is still expected to change over to freezing drizzle — possibly about 7:00 a.m. Precipitation is forecast to end about 4:00 p.m. Tuesday.

National Weather Service confidence in snow forecast is high. There is no chance of seeing the lunar eclipse tonight in the Chicago area.

URGENT – WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
544 PM CST MON DEC 20 2010

WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-LAKE IN-PORTER-NEWTON-JASPER-BENTON-INCLUDING THE CITIES OF… ROCKFORD …BELVIDERE… WOODSTOCK…WAUKEGAN…OREGON…DIXON…DEKALB…AURORA… WHEATON…CHICAGO…OTTAWA…OSWEGO…MORRIS…JOLIET…KANKAKEE…PONTIAC…WATSEKA…PAXTON…GARY…VALPARAISO…MOROCCO…RENSSELAER…FOWLER

544 PM CST MON DEC 20 2010 /644 PM EST MON DEC 20 2010/

…WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM CST
/11 AM EST/ TUESDAY…

A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM CST
/11 AM EST/ TUESDAY.

* TIMING…SNOW…HEAVY AT TIMES…WILL CONTINUE EARLY THIS
EVENING. SNOW WILL END FROM WEST TO EAST LATER THIS EVENING WITH
SOME FREEZING DRIZZLE DEVELOPING AFTER THE SNOW. AREAS OF
FREEZING DRIZZLE WILL CONTINUE INTO THE MORNING TUESDAY BEFORE
TEMPERATURES GRADUALLY RISE ABOVE FREEZING.

* ACCUMULATIONS…SNOW ACCUMULATIONS OF 3 TO 6 INCHES ARE
LIKELY…POSSIBLY FOLLOWED BY A MINOR ICE ACCUMULATION FROM
FREEZING DRIZZLE.

* HAZARDS…SNOW WILL BE HEAVY AT TIMES…REDUCING VISIBILITIES TO
BELOW A HALF MILE WITH SNOW FALL RATES POSSIBLY EXCEEDING AN
INCH PER HOUR AT TIMES EARLY THIS EVENING.

* IMPACTS…THE SNOW WILL RESULT IN TREACHEROUS DRIVING CONDITIONS
WITH BURSTS OF HEAVY SNOW MAKING IT NEAR IMPOSSIBLE FOR ROAD
CREWS TO KEEP UP WITH SNOW FALL RATES.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW…OR
FREEZING DRIZZLE WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES…AND USE CAUTION WHILE
DRIVING.


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