HAZARDOUS WEATHER OUTLOOK
Issue Date: 754 AM CST THU DEC 24 2009
Expiration: 800 AM CST FRI DEC 25 2009

/853 AM EST THU DEC 24 2009/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TODAY AND TONIGHT.
FREEZING RAIN WILL CONTINUE ACROSS THE NORTHERN HALF OF THE
OUTLOOK AREA THROUGH MIDDAY TODAY. ADDITIONAL ICE ACCUMULATIONS
WILL BE UP TO A TENTH OF AN INCH...WITH THE GREATEST
ACCUMULATIONS ON UNTREATED AND ELEVATED SURFACES. PLEASE REFERENCE
THE LATEST WINTER WEATHER STATEMENTS FOR WARNINGS AND ADVISORIES
THAT ARE IN EFFECT...AS WELL AS THE MOST UP TO DATE FORECAST
INFORMATION.
BY NOON TODAY...TEMPERATURES ARE EXPECTED TO RISE ABOVE
FREEZING. AS THIS TAKES PLACE...PRECIPITATION WILL TRANSITION
FROM FREEZING RAIN TO RAIN ACROSS THE OUTLOOK AREA. MODERATE TO
HEAVY RAIN IS EXPECTED TO PERSIST FROM THE AFTERNOON THROUGH THE
OVERNIGHT HOURS. THIS RAINFALL WILL COMBINE WITH RAPIDLY MELTING
SNOW AND ICE TO CREATE SIGNIFICANT AMOUNTS OF RUNOFF...WHICH MAY
RESULT IN RISES ALONG AREA RIVERS...AS WELL FLOODING OF LOW LYING
AND FLOOD PRONE AREAS.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
FLOODING THAT OCCURS AS A RESULT OF RAIN THURSDAY AFTERNOON
THROUGH FRIDAY MORNING WILL LIKELY PERSIST THROUGH A PORTION OF
THE DAY TWO THROUGH SEVEN PERIOD.
PRECIPITATION IS EXPECTED TO CHANGE BACK TO LIGHT SNOW SHOWERS
DURING THE DAY ON FRIDAY...AND THESE SNOW SHOWERS WILL PERSIST
THROUGH LATE SUNDAY. 1 TO 3 ADDITIONAL INCHES OF SNOW COULD
ACCUMULATE BY SUNDAY NIGHT.
.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH
TONIGHT...HOWEVER...SPOTTERS ARE ENCOURAGED TO REPORT ANY OBSERVED
FLOODING TO THE NATIONAL WEATHER SERVICE IN CHICAGO.
&&
COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO
$$

ICE STORM WARNING
Issue Date: 353 AM CST THU DEC 24 2009
Expiration: 1200 PM CST THU DEC 24 2009

...FREEZING RAIN TO CONTINUE ACROSS PARTS OF THE AREA THIS MORNING...
.WITH SURFACE TEMPERATURES HOVERING NEAR FREEZING...FREEZING RAIN
IS EXPECTED TO CONTINUE ACROSS THE AREA THIS MORNING. TEMPERATURES
WILL RISE ABOVE FREEZING BY NOON...CHANGING PRECIPITATION OVER TO
RAIN.
ILZ003>006-008-010>013-020-022-023-INZ001-002-010-011-241800-
/O.EXT.KLOT.IS.W.0001.000000T0000Z-091224T1800Z/
WINNEBAGO-BOONE-MCHENRY-LAKE IL-OGLE-LEE-DE KALB-KANE-DUPAGE-
KENDALL-WILL-KANKAKEE-LAKE IN-PORTER-NEWTON-JASPER-
INCLUDING THE CITIES OF...ROCKFORD...BELVIDERE...WOODSTOCK...
WAUKEGAN...OREGON...DIXON...DEKALB...AURORA...WHEATON...OSWEGO...
JOLIET...KANKAKEE...GARY...VALPARAISO...MOROCCO...RENSSELAER
353 AM CST THU DEC 24 2009
...ICE STORM WARNING NOW IN EFFECT UNTIL NOON CST TODAY...
THE ICE STORM WARNING IS NOW IN EFFECT UNTIL NOON CST TODAY.
* TIMING...FREEZING RAIN IS EXPECTED TO CONTINUE THROUGH THE
MORNING. FREEZING RAIN WILL TRANSITION TO RAIN BY NOON AS
TEMPERATURES RISE ABOVE FREEZING.
* ACCUMULATIONS...BETWEEN ONE QUARTER TO FOUR TENTHS OF AN INCH OF
ICE HAS ALREADY ACCUMULATED AT MANY LOCATIONS...ESPECIALLY ON
UNTREATED AND ELEVATED SURFACES. AN ADDITIONAL TENTH OF AN INCH
OF ICE WILL BE POSSIBLE THIS MORNING.
* HAZARDS...ACCUMULATION OF ICE. THE ACCUMULATION OF ICE WILL BE
GREATEST ON UNTREATED AND ELEVATED SURFACES. ICE FALLING FROM
ELEVATED STRUCTURES COULD ALSO POSE A HAZARD LATER THIS MORNING
AND AFTERNOON AS TEMPERATURES RISE ABOVE FREEZING.
* IMPACTS...ICE WILL LIKELY CONTINUE TO ACCUMULATE THIS
MORNING...WITH THE GREATEST ACCUMULATIONS ON UNTREATED
ROADWAYS...BRIDGES...OVERPASSES...AND ELEVATED SURFACES. WHILE
MANY PRIMARY ROADS HAVE BEEN TREATED...DRIVING CONDITIONS WILL
BE HAZARDOUS ON ANY ROAD SURFACE THAT BECOMES ICE COVERED.
INDIVIDUALS SHOULD ALSO REMAIN AWARE FOR FALLING ICE FROM
ELEVATED STRUCTURES LATER THIS MORNING AND AFTERNOON AS
TEMPERATURES BEGIN TO RISE ABOVE FREEZING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
AN ICE STORM WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE
EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF ICE ACCUMULATIONS
WILL MAKE TRAVEL DANGEROUS OR IMPOSSIBLE. TRAVEL IS STRONGLY
DISCOURAGED. COMMERCE WILL LIKELY BE SEVERELY IMPACTED. IF YOU
MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...FOOD...AND WATER IN YOUR
VEHICLE IN CASE OF AN EMERGENCY. ICE ACCUMULATIONS AND WINDS COULD LEAD
TO SNAPPED POWER LINES AND FALLING TREE BRANCHES THAT ADD TO THE
DANGER.
$$

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.
$$

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.
$$