HAZARDOUS WEATHER OUTLOOK
Issue Date: 429 AM CST MON DEC 21 2009
Expiration: 430 AM CST TUE DEC 22 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TODAY AND TONIGHT.
THERE IS A CHANCE OF ACCUMULATING SNOW LATE TONIGHT INTO EARLY
TUESDAY ACROSS THE OUTLOOK AREA. AT THIS TIME...IT APPEARS THAT
SNOWFALL AMOUNTS OF 2 OR 3 INCHES ARE POSSIBLE ALONG THE WISCONSIN
STATE LINE...TAPERING TO AN INCH OR LESS ALONG AN SOUTH OF
INTERSTATE 80...AND OVER NORTHWEST INDIANA.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
A MORE POTENT STORM SYSTEM IS EXPECTED TO AFFECT THE MIDWEST AS
EARLY AS WEDNESDAY AFTERNOON AND CONTINUE INTO CHRISTMAS DAY.
CURRENT INDICATIONS ARE THAT AN AREA OF LOW PRESSURE WILL DEVELOP
OVER THE SOUTHERN PLAINS WEDNESDAY...THEN LIFT NORTHWARD ALONG THE
MISSISSIPPI RIVER THURSDAY NIGHT INTO EARLY FRIDAY MORNING. IF THE
STORM WERE TO TAKE THIS TRACK...THIS COULD RESULT IN A PERIOD OF
MIXED PRECIPITATION INCLUDING SNOW...SLEET...AND FREEZING RAIN BY
WEDNESDAY NIGHT. SOME SIGNIFICANT SNOW AND ICE ACCUMULATIONS ARE
POSSIBLE OVER NORTH CENTRAL AND PERHAPS FAR NORTHERN ILLINOIS
BEFORE PRECIPITATION CHANGES TO ALL RAIN. THIS WOULD ALSO IMPLY AN
AREA OF HEAVY SNOW WEST OF THE FORECAST AREA...ACROSS PARTS OF
IOWA AND WISCONSIN.
COLD AIR WRAPPING AROUND THE BACK SIDE OF THE DEPARTING LOW IS
THEN EXPECTED TO CHANGE RAIN BACK TO SNOW OR SNOW SHOWERS OVER
MOST OF THE REGION BY DAYBREAK CHRISTMAS MORNING.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
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