HYDROLOGIC OUTLOOK
Issue Date: 129 PM CST TUE DEC 22 2009
Expiration: 1200 PM CST WED DEC 23 2009

...RENEWED RISES ON AREA RIVERS POSSIBLE LATER THIS WEEK...
A POTENT STORM SYSTEM WILL MOVE INTO THE AREA ON WEDNESDAY. THIS
SYSTEM IS EXPECTED TO BRING A WINTRY MIX OF SNOW...SLEET...AND
FREEZING RAIN BEFORE CHANGING OVER TO ALL RAIN BY THURSDAY. RAINFALL
AMOUNTS COULD RANGE FROM 1 TO NEARLY 2 INCHES OVER PORTIONS OF
NORTHERN ILLINOIS AND NORTHWEST INDIANA. THIS RAIN ALONG WITH
SNOWMELT WOULD LIKELY RESULT IN RENEWED RISES ON AREA RIVERS AND
CREEKS.
SNOW DEPTHS WERE GREATEST WITHIN PORTIONS OF THE ROCK...UPPER
FOX...AND UPPER DES PLAINES RIVER BASINS WHERE DEPTHS WERE BETWEEN 4
AND 8 INCHES. WATER EQUIVALENT OF THE SNOWPACK IN THOSE AREAS WAS
AROUND 1 INCH. FURTHER SOUTH...SNOW DEPTHS WERE BETWEEN 2 AND 4
INCHES WITH WATER EQUIVALENTS GENERALLY BELOW ONE-HALF INCH.
REPORTED FROST DEPTHS WERE BETWEEN 2 AND 4 INCHES. ALTHOUGH RIVERS
WERE CURRENTLY BELOW FLOOD STAGE...FLOWS WERE SLIGHTLY ABOVE NORMAL.
A COMBINATION OF HEAVY RAIN AND SNOWMELT OVER FROZEN GROUND WOULD
RESULT IN RISES ON AREA STREAMS WITH SOME RISES POSSIBLY ABOVE FLOOD
STAGE.
RESIDENTS IN LOW LYING FLOOD PRONE AREAS ALONG AREA RIVERS AND
CREEKS SHOULD CONTINUE TO MONITOR THIS DEVELOPING WEATHER SYSTEM.
$$
WDM

HAZARDOUS WEATHER OUTLOOK
Issue Date: 1226 PM CST TUE DEC 22 2009
Expiration: 1230 PM CST WED DEC 23 2009

/125 PM EST TUE DEC 22 2009/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...THIS AFTERNOON AND TONIGHT.
SNOW WILL TAPER TO SCATTERED LIGHT SNOW SHOWERS TODAY ACROSS
MAINLY AREAS TO THE NORTH OF A LINE FROM ROCHELLE TO VALPARAISO.
SCATTERED LIGHT SNOW...SLEET...OR FREEZING RAIN IS EXPECTED TO
DEVELOP ACROSS AREAS TO THE SOUTH OF THIS ROCHELLE TO VALPARAISO
LINE THIS EVENING AND DURING THE OVERNIGHT HOURS. UNTREATED AREA
ROADS MAY CONTINUE TO BE SLIPPERY THIS AFTERNOON AND TONIGHT.
.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.
A STRONGER STORM SYSTEM IS EXPECTED TO DEVELOP OVER THE SOUTHERN
PLAINS TODAY AND WEDNESDAY...AND WILL INTENSIFY AS IT LIFTS NORTHWARD UP
THE MISSISSIPPI VALLEY WEDNESDAY THROUGH FRIDAY. THIS WILL
RESULT IN A PERIOD OF SNOW...SLEET AND FREEZING RAIN...DEVELOPING
AS EARLY AS WEDNESDAY MORNING...AND CONTINUING INTO THURSDAY
MORNING...BEFORE PRECIPITATION GRADUALLY CHANGES TO ALL RAIN
DURING THE DAY THURSDAY. 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 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...ESPECIALLY FOR THOSE HEADING WEST ACROSS
IOWA...AND NORTH INTO MINNESOTA AND WISCONSIN. 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
$$

WINTER STORM WATCH
Issue Date: 1131 AM CST TUE DEC 22 2009
Expiration: 1200 PM CST THU DEC 24 2009

...WINTER STORM TO BRING SLEET AND FREEZING RAIN TO AREA WEDNESDAY
INTO THURSDAY...
.LOW PRESSURE ASSOCIATED WITH A DEVELOPING WINTER STORM WILL LIFT
FROM THE SOUTHERN PLAINS INTO THE MISSISSIPPI VALLEY THROUGH
THURSDAY. WHILE THE TRACK OF THE STORM WILL KEEP HEAVY SNOWS WEST
OF THE AREA...WARM MOIST AIR FLOWING NORTH ACROSS NORTHERN ILLINOIS
AND INDIANA WILL RIDE UP OVER COLD AIR NEAR THE GROUND...AND IS
EXPECTED TO RESULT IN A PERIOD OF SLEET AND FREEZING RAIN FROM
WEDNESDAY INTO THURSDAY MORNING. FREEZING RAIN MAY RESULT IN UP
TO A QUARTER INCH OF ICE ACCUMULATION OVER PARTS OF THE WATCH AREA
ESPECIALLY LATE WEDNESDAY AND WEDNESDAY NIGHT. SURFACE
TEMPERATURES WILL THEN RISE ABOVE FREEZING FROM SOUTH TO NORTH BY
MIDDAY THURSDAY...WITH PRECIPITATION CHANGING TO RAIN OVER THE
AREA BY THURSDAY AFTERNOON.
ILZ003>006-008-010>014-019>023-INZ001-002-010-011-230145-
/O.NEW.KLOT.WS.A.0004.091223T1800Z-091224T1800Z/
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK-
LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LAKE IN-PORTER-NEWTON-
JASPER-
INCLUDING THE CITIES OF...ROCKFORD...BELVIDERE...WOODSTOCK...
WAUKEGAN...OREGON...DIXON...DEKALB...AURORA...WHEATON...CHICAGO...
OTTAWA...OSWEGO...MORRIS...JOLIET...KANKAKEE...GARY...
VALPARAISO...MOROCCO...RENSSELAER
1131 AM CST TUE DEC 22 2009
...WINTER STORM WATCH IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH
THURSDAY MORNING...
THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A WINTER STORM
WATCH...WHICH IS IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH
THURSDAY MORNING.
* TIMING...LIGHT SLEET AND FREEZING RAIN WILL BEGIN DURING THE DAY
WEDNESDAY. HEAVIEST FREEZING RAIN IS EXPECTED FROM WEDNESDAY
EVENING INTO THURSDAY MORNING.
* ACCUMULATIONS...UP TO A QUARTER INCH OF ICE.
* HAZARDS...ACCUMULATION. SOME SLEET AND LIGHT SNOW MAY MIX AS
PRECIPITATION BEGINS ON WEDNESDAY.
* IMPACTS...GLAZING OF ROADWAYS...PARKING LOTS AND SIDEWALKS. THIS
WILL MAKE FOR HAZARDOUS TRAVEL ON UNTREATED SURFACES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL.
CONTINUE TO MONITOR THE LATEST FORECASTS.
$$
RATZER