HAZARDOUS WEATHER OUTLOOK
Issue Date: 444 AM CST THU DEC 31 2009
Expiration: 445 AM CST FRI JAN 01 2010
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TODAY AND TONIGHT.
PORTIONS OF THE UPPER DES PLAINES AND ILLINOIS RIVERS WILL REMAIN
IN FLOOD.
SOME LOCALIZED WATER LEVEL RISES ON AREA RIVERS ARE POSSIBLE DUE
TO ICE JAMS.
WIND CHILLS ARE EXPECTED TO RANGE FROM MINUS 10 TO MINUS 15
TONIGHT.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
WIND CHILL VALUES WILL RANGE FROM MINUS 10 TO MINUS 15 DURING THE
MORNING HOURS OF SATURDAY AND SUNDAY AS A RESULT OF ARCTIC AIR
AND BRISK NORTHWEST WINDS ACROSS THE AREA.
THERE IS AN INCREASING POTENTIAL OF LAKE EFFECT SNOW SHOWERS
ACROSS PORTIONS OF NORTHWEST INDIANA FRIDAY THROUGH SUNDAY AND
POSSIBLY CONTINUING INTO EARLY NEXT WEEK. PRESENT INDICATIONS
SUGGEST THAT THE HEAVIER LAKE EFFECT SNOW MAY AFFECT NORTH CENTRAL
INDIANA INTO SOUTHWEST LOWER MICHIGAN WITH LIGHTER SNOW
ACCUMULATIONS ACROSS LAKE...JASPER...AND PORTER COUNTIES IN
NORTHWEST INDIANA. HOWEVER...THERE IS STILL SOME UNCERTAINTY
REGARDING THE EXACT DIRECTIONS OF LOW LEVEL WINDS THAT ARE
CRITICAL IN DETERMINING WHERE THE HEAVIEST LAKE EFFECT SNOW WILL
FALL DURING THIS PERIOD. ANY SMALL CHANGE TO THE WIND DIRECTION
FORECAST MAY RESULT IN THESE HEAVIER SNOW ACCUMULATIONS SHIFTING
WESTWARD INTO ESPECIALLY PORTER COUNTY IN NORTHWEST INDIANA. LATER
FORECASTS SHOULD BE MONITORED REGARDING THE POTENTIAL FOR
SIGNIFICANT LAKE EFFECT SNOW THIS WEEKEND INTO THE EARLY PORTION
OF NEXT WEEK. IN ADDITION...GUSTY NORTHWEST WINDS WILL RESULT IN
THE POSSIBILITY OF SOME BLOWING SNOW IN ASSOCIATION WITH ANY LAKE
EFFECT SNOW THAT FALLS.
PORTIONS OF THE UPPER DES PLAINES AND ILLINOIS RIVERS WILL REMAIN
IN FLOOD INTO EARLY SATURDAY.
LOCALIZED ICE JAM FLOODING IS POSSIBLE ON AREA RIVERS AS ANOTHER
ARCTIC AIR MASS MOVES INTO THE AREA ON THURSDAY...AND LINGERS
THROUGH EARLY NEXT WEEK.
.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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