HAZARDOUS WEATHER OUTLOOK
Issue Date: 1005 AM CST WED DEC 23 2009
Expiration: 1015 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.
A MIX OF FREEZING RAIN AND SLEET WILL CONTINUE TO OVERSPREAD THE
ENTIRE AREA THIS MORNING AND AFTERNOON FROM SOUTH TO NORTH.
PRECIPITATION SOUTH OF I-80 IS EXPECTED TO PRIMARILY BE IN THE
FORM OF FREEZING RAIN THIS MORNING AND EARLY AFTERNOON...BEFORE
TEMPERATURES GRADUALLY RISE ABOVE FREEZING. NORTH OF
I-80...FREEZING RAIN WILL MIX WITH SLEET AND PERHAPS A FEW SNOW
FLAKES LATE THIS MORNING THROUGH THE OVERNIGHT HOURS. TEMPERATURES
ACROSS THIS AREA ARE EXPECTED TO VERY SLOWLY TRANSITION TO ABOVE
FREEZING...THOUGH THE EXACT EVOLUTION OF THIS TRANSITION IS
UNCERTAIN AT THIS TIME. WHEN THIS TRANSITION DOES TAKE
PLACE...PRECIPITATION WILL CHANGE TO JUST RAIN.
WHILE THE EXACT TIMING OF TEMPERATURES RISING ABOVE FREEZING IS
UNCERTAIN AT ANY GIVEN LOCATION...IT DOES APPEAR THAT BY THURSDAY
AFTERNOON...SURFACE TEMPERATURES WILL HAVE TRANSITIONED TO ABOVE FREEZING
AT MOST LOCATIONS.
WINTER WEATHER ADVISORIES ARE IN EFFECT FOR THE ENTIRE OUTLOOK
AREA. PLEASE REFERENCE THE LATEST WINTER WEATHER STATEMENTS FOR
THE LATEST FORECAST INFORMATION...AS WELL AS ANY CHANGES TO THE
CURRENT ADVISORIES IN EFFECT...ALONG WITH ANY ADDITIONAL
WATCES...WARNINGS...OR ADVISORIES THAT MAY BE ISSUED.
.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.
A FLOOD WATCH HAS BEEN ISSUED FOR THE OUTLOOK AREA.
.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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