WINTER WEATHER ADVISORY
Issue Date: 236 PM CST WED DEC 23 2009
Expiration: 1200 PM CST THU DEC 24 2009

...WINTRY MIX OF PRECIPITATION TO CONTINUE OVER PORTIONS OF
NORTHERN ILLINOIS AND NORTHWEST INDIANA...
.A STRONG STORM SYSTEM CURRENTLY ORGANIZING OVER THE SOUTHERN
PLAINS WILL CONTINUE TO MOVE NORTH TOWARD THE AREA TODAY THROUGH
THE DAY ON THURSDAY. A MIXTURE OF FREEZING
RAIN...SLEET...SNOW...AND RAIN WILL CONTINUE TO OVERSPREAD THE
AREA TODAY. TEMPERATURES AT THE SURFACE WILL VERY GRADUALLY RISE
ABOVE FREEZING DURING THE OVERNIGHT HOURS AND DURING THE MORNING
THURSDAY...CHANGING THE WINTRY MIX OVER TO ALL RAIN.
ILZ013-014-020-022-023-INZ001-002-010-011-240445-
/O.EXT.KLOT.WW.Y.0014.000000T0000Z-091224T1800Z/
DUPAGE-COOK-KENDALL-WILL-KANKAKEE-LAKE IN-PORTER-NEWTON-JASPER-
INCLUDING THE CITIES OF...WHEATON...CHICAGO...OSWEGO...JOLIET...
KANKAKEE...GARY...VALPARAISO...MOROCCO...RENSSELAER
236 PM CST WED DEC 23 2009
...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL NOON CST
THURSDAY...
THE WINTER WEATHER ADVISORY IS NOW IN EFFECT UNTIL NOON CST
THURSDAY.
* TIMING...A MIXTURE OF FREEZING RAIN AND SLEET WILL CONTINUE TO
MOVE NORTH ACROSS THE AREA TODAY AND CONTINUE THROUGH THURSDAY
MORNING. TEMPERATURES HAVE RISEN A DEGREE OR TWO ACROSS PARTS OF
THE ADVISORY AREA...HOWEVER...LITTLE OR NO ADDITIONAL
TEMPERATURE RISES ARE EXPECTED BEFORE THURSDAY MORNING. AS
TEMPERATURES WARM ABOVE FREEZING ON THURSDAY...THE PRECIPITATION
WILL TRANSITION TO RAIN.
* ACCUMULATIONS...LESS THAN A HALF INCH OF SLEET...AND UP TO A
TENTH OF AN INCH OF ADDITIONAL ICE ACCUMULATION IS EXPECTED.
* HAZARDS...ACCUMULATION OF ICE.
* IMPACTS...THE GREATEST ICE ACCUMULATIONS WILL BE ON ELEVATED
SURFACES...VEHICLES...AND OTHER UNTREATED SURFACES. THIS WILL
MAKE FOR HAZARDOUS TRAVEL ON UNTREATED ROADWAYS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A WINTER WEATHER ADVISORY MEANS THAT A COMBINATION OF SNOW...
SLEET...OR FREEZING RAIN WILL RESULT IN SLIPPERY ROADWAYS AND
CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR HAZARDOUS DRIVING
CONDITIONS AND USE CAUTION WHILE TRAVELING.
$$

HAZARDOUS WEATHER OUTLOOK
Issue Date: 1011 AM CST WED DEC 23 2009
Expiration: 1015 AM CST THU DEC 24 2009

/1105 AM EST WED DEC 23 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
$$

FLOOD WATCH
Issue Date: 345 AM CST WED DEC 23 2009
Expiration: 600 AM CST FRI DEC 25 2009

...HEAVY RAIN AND FLOODING POSSIBLE THURSDAY AFTERNOON THROUGH
FRIDAY MORNING...
.A DEVELOPING WINTER STORM OVER THE SOUTHERN PLAINS WILL MOVE
NORTH TO IOWA BY FRIDAY MORNING. AFTER A PERIOD OF WINTRY
PRECIPITATION WEDNESDAY AFTERNOON INTO THURSDAY MORNING...WARM
MOIST AIR WILL SPREAD NORTH ACROSS THE AREA WITH PERIODS OF
HEAVY RAIN EXPECTED THURSDAY AFTERNOON AND THURSDAY NIGHT.
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
231745-
/O.NEW.KLOT.FA.A.0003.091224T1800Z-091225T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-COOK-
LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-
LAKE IN-PORTER-NEWTON-JASPER-BENTON-
INCLUDING THE CITIES OF...ROCKFORD...BELVIDERE...WOODSTOCK...
WAUKEGAN...OREGON...DIXON...DEKALB...AURORA...WHEATON...CHICAGO...
OTTAWA...OSWEGO...MORRIS...JOLIET...KANKAKEE...PONTIAC...
WATSEKA...PAXTON...GARY...VALPARAISO...MOROCCO...RENSSELAER...
FOWLER
345 AM CST WED DEC 23 2009 /445 AM EST WED DEC 23 2009/
...FLOOD WATCH IN EFFECT FROM THURSDAY AFTERNOON THROUGH LATE
THURSDAY NIGHT...
THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A
* FLOOD WATCH FOR PORTIONS OF ILLINOIS AND INDIANA...INCLUDING
THE FOLLOWING AREAS...IN ILLINOIS...BOONE...COOK...DE KALB...
DUPAGE...FORD...GRUNDY...IROQUOIS...KANE...KANKAKEE...
KENDALL...LA SALLE...LAKE IL...LEE...LIVINGSTON...MCHENRY...
OGLE...WILL AND WINNEBAGO. IN INDIANA...BENTON...JASPER...LAKE
IN...NEWTON AND PORTER.
* FROM THURSDAY AFTERNOON THROUGH LATE THURSDAY NIGHT.
* HEAVY RAIN IS EXPECTED TO DEVELOP ACROSS NORTHERN ILLINOIS AND
NORTHWEST INDIANA BY THURSDAY AFTERNOON AND CONTINUE THROUGH
EARLY FRIDAY MORNING. STORM TOTAL RAINFALL AMOUNTS OF 1 TO 2
INCHES WILL BE COMMON. SOME AREAS MAY RECEIVE AS MUCH AS 3
INCHES BY FRIDAY MORNING.
* THE DEPTH OF THE CURRENT SNOW PACK RANGES FROM 5 TO 8 INCHES
OVER NORTHWEST ILLINOIS TO 1 TO 3 INCHES ACROSS NORTHWEST
INDIANA. AS THIS SNOW MELTS...COMBINED WITH THE EXPECTED HEAVY
RAIN...AND FROZEN GROUND CONDITIONS...RAPID RUNOFF AND RISES ON
AREA RIVERS ARE EXPECTED. SOME RIVERS MAY REACH OR EXCEED FLOOD
STAGE. FLOODING OF LOW LYING AND FLOOD PRONE AREAS WILL ALSO BE
POSSIBLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON
CURRENT FORECASTS.
YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE
FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE
PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP.
$$

WINTER STORM WATCH
Issue Date: 933 PM CST TUE DEC 22 2009
Expiration: 1200 PM CST THU DEC 24 2009

...A WINTER MIX OF PRECIPITATION FOR NORTHERN ILLINOIS AND
NORTHWEST INDIANA TONIGHT THROUGH THURSDAY...
.A LOW WILL MOVE FROM ARIZONA TO NORTHEAST IOWA BY SATURDAY
NOON. A SLOW MOVING WARM FRONT WILL MOVE NORTHWARD THROUGH
NORTHERN ILLINOIS AND NORTHWEST INDIANA EARLY WEDNESDAY THROUGH
THURSDAY MORNING.
ILZ019-021-023-INZ010-011-231145-
/O.CON.KLOT.WW.Y.0014.000000T0000Z-091223T1800Z/
/O.CON.KLOT.WS.A.0004.091223T1800Z-091224T1800Z/
LA SALLE-GRUNDY-KANKAKEE-NEWTON-JASPER-
INCLUDING THE CITIES OF...OTTAWA...MORRIS...KANKAKEE...MOROCCO...
RENSSELAER
933 PM CST TUE DEC 22 2009
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON CST
WEDNESDAY...
...WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH THURSDAY MORNING...
A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON CST
WEDNESDAY. A WINTER STORM WATCH REMAINS IN EFFECT FROM WEDNESDAY
AFTERNOON THROUGH THURSDAY MORNING.
* TIMING...FREEZING DRIZZLE AND SLEET WILL CONTINUE OVERNIGHT AND
WILL LAST THROUGH LATE WEDNESDAY MORNING. LATER WEDNESDAY
AFTERNOON AND OVERNIGHT...WE EXPECT FREEZING RAIN AND SLEET. THE
FREEZING RAIN AND SLEET WILL BECOME RAIN THURSDAY AFTERNOON.
* ACCUMULATIONS...A TRACE OF ICE IS POSSIBLE OVERNIGHT AND
WEDNESDAY MORNING. THE FREEZING RAIN WEDNESDAY AFTERNOON AND
OVERNIGHT MAY RESULT IN 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.
A WINTER WEATHER ADVISORY MEANS THAT FREEZING DRIZZLE WILL RESULT
IN SLIPPERY ROADWAYS AND CAUSE TRAVEL DIFFICULTIES. BE PREPARED
FOR HAZARDOUS DRIVING CONDITIONS AND USE CAUTION WHILE TRAVELING.
$$