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: 430 PM CST TUE DEC 22 2009
Expiration: 415 PM CST WED DEC 23 2009

/511 PM EST TUE DEC 22 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
$$

WINTER STORM WATCH
Issue Date: 336 PM CST TUE DEC 22 2009
Expiration: 1200 PM CST THU DEC 24 2009

...WINTER STORM TO BRING FREEZING DRIZZLE TO PARTS OF THE AREA
TONIGHT...FOLLOWED BY SLEET AND FREEZING RAIN 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...CREATING PERIODS OF FREEZING DRIZZLE...FREEZING RAIN...AND
SLEET ACROSS THE AREA. FREEZING DRIZZLE IS EXPECTED TO BEGIN LATE
THIS EVENING ACROSS AREAS ALONG AND SOUTH OF INTERSTATE 80...AND
MAY RESULT IN GLAZING ON ROADWAYS. A MORE SUBSTANTIAL AREA OF
PRECIPITATION WILL DEVELOP AND BEGIN MOVING INTO THE AREA FROM
THE SOUTH WEDNESDAY MORNING...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>014-020-022-INZ001-002-230545-
/O.CON.KLOT.WS.A.0004.091223T1800Z-091224T1800Z/
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK-
KENDALL-WILL-LAKE IN-PORTER-
INCLUDING THE CITIES OF...ROCKFORD...BELVIDERE...WOODSTOCK...
WAUKEGAN...OREGON...DIXON...DEKALB...AURORA...WHEATON...CHICAGO...
OSWEGO...JOLIET...GARY...VALPARAISO
335 PM CST TUE DEC 22 2009
...WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH THURSDAY MORNING...
A WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH THURSDAY MORNING.
* TIMING...LIGHT SLEET AND FREEZING RAIN WILL BEGIN DURING THE DAY
  WEDNESDAY. CURRENTLY...THERE IS SOME INDICATION THAT AREAS JUST
  ALONG THE SHORE OF LAKE MICHIGAN MAY REMAIN JUST WARM ENOUGH FOR
  PRECIPITATION TO REMAIN AS RAIN. HOWEVER...EVEN IF THIS IS THE
  CASE...THE INFLUENCE OF THE LAKE WOULD LIKELY STRETCH JUST A FEW
  MILES INLAND...WITH THE WESTERN PORTIONS OF COUNTIES ALONG
  LAKE MICHIGAN REMAINING BELOW FREEZING. HEAVIEST FREEZING RAIN
  IS EXPECTED FROM WEDNESDAY EVENING INTO THURSDAY MORNING.
* ACCUMULATIONS...UP TO A QUARTER INCH OF ICE.
* HAZARDS...ACCUMULATION OF ICE. 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.
&&
$$