HAZARDOUS WEATHER OUTLOOK
Issue Date: 1007 PM CST MON DEC 21 2009
Expiration: 1015 PM CST TUE DEC 22 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...OVERNIGHT.
SNOW WILL DEVELOP ACROSS THE AREA OVERNIGHT...BECOMING STEADIER
AFTER MIDNIGHT. ACCUMULATIONS ARE EXPECTED TO RANGE FROM 1 TO 3 INCHES
ACROSS THE AREA BY MID MORNING TUESDAY WITH THE GREATER
ACCUMULATIONS ALONG AND NORTH OF THE INTERSTATE 80 CORRIDOR. SOME
ROADS MAY BECOME SLIPPERY AS SNOW ACCUMULATES LATE TONIGHT AND
EARLY TUESDAY.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
SNOW WILL TAPER TO SCATTERED SNOW SHOWERS BY TUESDAY AFTERNOON.
SOME ROADS...ESPECIALLY ACROSS NORTH CENTRAL ILLINOIS...MAY BE
SLIPPERY DUE TO MINOR ACCUMULATIONS ESPECIALLY DURING THE MORNING
HOURS.
A STRONGER STORM SYSTEM IS EXPECTED TO DEVELOP OVER THE SOUTHERN
PLAINS BY MID WEEK...AND WILL THEN LIFT SLOWLY NORTHEAST ACROSS
THE UPPER MIDWEST AND WESTERN GREAT LAKES REGION THROUGH THE END
OF THE WEEK. WHILE THE EXACT PATH AND STRENGTH OF THIS STORM
SYSTEM REMAINS UNCERTAIN...CURRENT INDICATIONS ARE THAT THE LOW
PRESSURE SYSTEM WILL MOVE FROM MISSOURI INTO FAR NORTHERN OR
NORTHWEST ILLINOIS BY CHRISTMAS MORNING. WHILE HEAVY SNOW WOULD
LIKELY OCCUR WELL TO THE WEST OR NORTHWEST OF THE AREA...THIS
TRACK WOULD LIKELY RESULT IN A PERIOD OF MIXED PRECIPITATION...
POTENTIALLY SNOW...SLEET AND FREEZING RAIN...DEVELOPING ACROSS THE
REGION WEDNESDAY AND CONTINUING INTO THURSDAY MORNING.
PRECIPITATION MAY THEN SWITCH TO ALL RAIN BY CHRISTMAS EVE AS
TEMPERATURES CLIMB ABOVE FREEZING. ONCE THE LOW PULLS NORTH OF THE
AREA CHRISTMAS DAY...PRECIPITATION IS EXPECTED TO CHANGE BACK OVER
TO LIGHT SNOW OR SNOW SHOWERS WHICH MAY LINGER INTO SATURDAY.
THIS STORM SYSTEM HAS THE POTENTIAL TO IMPACT TRAVEL DURING THE
CHRISTMAS HOLIDAY PERIOD. PERSONS PLANNING TRAVEL ACROSS THE
MIDWEST BETWEEN WEDNESDAY AND SATURDAY SHOULD MONITOR FURTHER
FORECASTS AND STATEMENTS FOR THE LATEST INFORMATION ON THIS
DEVELOPING WINTER STORM.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT...
HOWEVER SPOTTERS ARE ENCOURAGED TO REPORT SNOWFALL TOTALS TO THE
NATIONAL WEATHER SERVICE CHICAGO.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
SPECIAL WEATHER STATEMENT
Issue Date: 402 PM CST MON DEC 21 2009
Expiration: 500 AM CST TUE DEC 22 2009
...SIGNIFICANT WINTER STORM TO AFFECT PORTIONS OF THE MIDWEST
WEDNESDAY THROUGH CHRISTMAS DAY...
A STRONG STORM SYSTEM CURRENTLY MOVING ONSHORE ALONG THE WEST
COAST OF THE UNITED STATES IS EXPECTED TO STRENGTHEN AS IT MOVES
NORTHEAST ACROSS THE SOUTHERN PLAINS AND MIDWEST DURING THE MIDDLE OF
THE WEEK...BRINGING A MIX OF SNOW...SLEET...FREEZING RAIN...AND
RAIN TO THE AREA.
CURRENT FORECAST INFORMATION INDICATES THAT PRECIPITATION WILL
LIKELY BEGIN EARLY WEDNESDAY MORNING ACROSS AREAS TO THE SOUTH OF
INTERSTATE 80 AS A MIX OF SNOW...SLEET...AND FREEZING RAIN...BEFORE
SPREADING NORTH ACROSS THE ENTIRE AREA DURING THE DAY ON
WEDNESDAY. AS A STRONG AREA OF LOW PRESSURE MOVES NORTH INTO FAR
EASTERN IOWA OR WESTERN ILLINOIS...PRECIPITATION IS EXPECTED TO
GRADUALLY CHANGE OVER TO ALL RAIN ACROSS AREAS TO THE SOUTH OF
I-80 VERY LATE WEDNESDAY NIGHT. PRECIPITATION WILL LIKELY THEN CHANGE
TO ALL RAIN ACROSS THE REMAINDER OF THE FORECAST AREA BY THURSDAY
AFTERNOON. A GRADUAL CHANGE BACK TO SNOW IS EXPECTED FROM WEST TO
EAST ON FRIDAY AFTERNOON.
WHILE AVAILABLE FORECAST INFORMATION IS IN GENERALLY GOOD
AGREEMENT REGARDING THE LARGE SCALE EVOLUTION OF THIS STORM
SYSTEM...IT IS STILL FAR TOO EARLY TO DETERMINE THE EXACT DETAILS
OF THIS WINTER STORM...INCLUDING ANY ACCUMULATIONS OF
SNOW...SLEET...OR FREEZING RAIN.
WITH A PROLONGED PERIOD OF MIXED PRECIPITATION EXPECTED ACROSS
THE AREA...TRAVEL CONDITIONS MAY BE SIGNIFICANTLY AFFECTED ACROSS
THE MIDWEST WEDNESDAY THROUGH CHRISTMAS DAY. INDIVIDUALS WHO PLAN
ON TRAVELING THROUGH THE AREA LATER THIS WEEK ARE STRONGLY
ENCOURAGED TO REMAIN ALERT FOR CHANGING WEATHER CONDITIONS...AND
ANY WATCHES...WARNINGS...OR ADVISORIES THAT MAY BE ISSUED BY THE
NATIONAL WEATHER SERVICE.
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