HAZARDOUS WEATHER OUTLOOK
Issue Date: 411 PM CST TUE DEC 22 2009
Expiration: 415 PM CST WED DEC 23 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TONIGHT.
SCATTERED LIGHT SNOW SHOWERS WILL CONTINUE THROUGH EARLY EVENING ACROSS
AREAS TO THE NORTH AND NORTHEAST OF A LINE FROM ROCHELLE TO VALPARAISO.
AREAS OF FREEZING DRIZZLE ARE EXPECTED TO DEVELOP ACROSS AREAS TO
THE SOUTH OF INTERSTATE 80 LATE THIS EVENING THROUGH THE
OVERNIGHT HOURS. UNTREATED AREA ROADS MAY CONTINUE TO BE SLIPPERY
TONIGHT.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.
FREEZING DRIZZLE WILL CONTINUE ACROSS AREAS ALONG AND TO THE SOUTH
OF INTERSTATE 80 THROUGH LATE MORNING. AT THE SAME TIME...A
STRENGTHENING STORM SYSTEM OVER THE SOUTHERN PLAINS WILL RESULT IN
A MORE SUBSTANTIAL AREA OF PRECIPITATION MOVING NORTH ACROSS THE
AREA BEGINNING DURING THE DAY WEDNESDAY. THIS WILL RESULT IN A
PERIOD OF FREEZING RAIN MIXED WITH SNOW AND SLEET OVERSPREADING
THE AREA WEDNESDAY...BEFORE PRECIPITATION TURNS TO ALL FREEZING
RAIN LATER IN THE AFTERNOON WEDNESDAY AND WEDNESDAY EVENING.
SURFACE TEMPERATURES ARE THEN EXPECTED TO GRADUALLY WARM ABOVE
FREEZING ON THURSDAY...RESULTING IN A CHANGE OVER TO ALL RAIN. COLDER
AIR WILL THEN CIRCULATE AROUND THE STORM CENTER ALLOWING
PRECIPITATION TO CHANGE BACK TO LIGHT SNOW OR SNOW SHOWERS ON
CHRISTMAS DAY...WITH PERIODS OF LIGHT SNOW CONTINUING INTO SUNDAY
AS THE LOW CENTER DRIFTS OFF ACROSS THE UPPER MIDWEST.
A WINTER STORM WATCH AND WINTER WEATHER ADVISORY IS NOW IN EFFECT
FOR PORTIONS OF THE OUTLOOK AREA. PLEASE REFERENCE THE LATEST
WINTER WEATHER STATEMENTS FROM THE NATIONAL WEATHER SERVICE FOR
THE LATEST FORECAST INFORMATION...AS WELL AS ANY ADDITIONAL
WATCHES...WARNINGS...OR ADVISORIES THAT MAY BE ISSUED.
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
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