HAZARDOUS WEATHER OUTLOOK
Issue Date: 513 AM CST WED DEC 23 2009
Expiration: 515 AM CST THU DEC 24 2009
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TODAY AND TONIGHT.
FREEZING DRIZZLE AND SLEET...POSSIBLY MIXED WITH SNOW WILL
DEVELOP OVER PORTIONS OF NORTHWEST INDIANA THIS MORNING...AND
CONTINUE INTO THIS EVENING BEFORE CHANGING TO RAIN.
MIXED PRECIPITATION IS ALSO EXPECTED TO BECOME MORE WIDESPREAD
ACROSS MUCH OF NORTHERN ILLINOIS TODAY. SURFACE TEMPERATURES
OVER NORTHERN ILLINOIS WILL STAY AT OR JUST BELOW FREEZING
GENERALLY ALONG AND NORTH OF INTERSTATE 88...AND WEST OF THE CITY
OF CHICAGO. ICE ACCUMULATIONS OF UP TO A QUARTER INCH ARE EXPECTED
IN THESE AREAS BY THURSDAY MORNING.
SURFACE TEMPERATURES ARE EXPECTED TO WARM ABOVE FREEZING BY MIDDAY
THURSDAY...RESULTING IN A CHANGE OVER TO ALL RAIN OVER THE ENTIRE
FORECAST AREA.
.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.
A MORE SUBSTANTIAL AREA OF PRECIPITATION IS EXPECTED TO OVERSPREAD
THE AREA THURSDAY AFTERNOON AND CONTINUE MUCH OF THURSDAY NIGHT.
BY THIS TIME...PRECIPITATION WILL BE ENTIRELY IN THE FORM OF RAIN.
GIVEN THE POTENTIALLY HEAVY RAINFALL...COMBINED WITH MELTING SNOW
AND FROZEN GROUND...FLOODING OF RIVERS AND LOW LYING AREAS
APPEARS LIKELY.
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 MIDWEST.
WINTER WEATHER ADVISORIES ARE 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.
A FLOOD WATCH HAS ALSO BEEN ISSUED FOR THE OUTLOOK AREA.
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
INTENSIFYING WINTER STORM.
.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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