Wind Advisory 9, NWS Chicago, IL

006 
WWUS73 KLOT 280351
NPWLOT

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
951 PM CST SUN DEC 27 2015

...VERY STRONG EAST WINDS ON MONDAY...

ILZ006-014-281200-
/O.CON.KLOT.HW.W.0001.151228T1900Z-151229T0100Z/
LAKE IL-COOK-
INCLUDING THE CITIES OF...WAUKEGAN...CHICAGO
951 PM CST SUN DEC 27 2015

...HIGH WIND WARNING REMAINS IN EFFECT FROM 1 PM TO 7 PM CST
MONDAY...

* TIMING...MONDAY EARLY AFTERNOON THROUGH EARLY EVENING.

* WINDS...EAST WINDS SUSTAINED 35 TO 45 MPH...GUSTS UP TO 60 MPH.

* IMPACTS...PROPERTY DAMAGE AND POWER OUTAGES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED
OR OCCURRING. SUSTAINED WIND SPEEDS OF AT LEAST 40 MPH OR GUSTS
OF 58 MPH OR MORE CAN LEAD TO PROPERTY DAMAGE.

&&

$$

ILZ013-021>023-032-033-039-INZ001-002-010-011-019-281200-
/O.CON.KLOT.WI.Y.0009.151228T1500Z-151229T0000Z/
DUPAGE-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-LAKE IN-
PORTER-NEWTON-JASPER-BENTON-
INCLUDING THE CITIES OF...WHEATON...MORRIS...JOLIET...KANKAKEE...
PONTIAC...WATSEKA...PAXTON...GARY...VALPARAISO...MOROCCO...
RENSSELAER...FOWLER
951 PM CST SUN DEC 27 2015 /1051 PM EST SUN DEC 27 2015/

...WIND ADVISORY REMAINS IN EFFECT FROM 9 AM CST /10 AM EST/ TO
6 PM CST /7 PM EST/ MONDAY...

* TIMING...MONDAY MORNING THROUGH THE LATE AFTERNOON.

* WINDS...EAST WINDS SUSTAINED 25 TO 35 MPH...GUSTS UP TO 50 MPH.

* IMPACTS...MINOR TREE DAMAGE AND DIFFICULT TRAVEL...ESPECIALLY 
  ON NORTH TO SOUTH ROADS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR
GUSTS BETWEEN 45 AND 57 MPH...ARE LIKELY. WINDS THIS STRONG CAN
CAUSE MINOR PROPERTY DAMAGE UNLESS PRECAUTIONS ARE TAKEN. DRIVING
MAY BE DIFFICULT...ESPECIALLY IN HIGH PROFILE VEHICLES. MOTORISTS
SHOULD BE ALERT AND USE CAUTION.

&&

$$

RATZER

251 
WWUS73 KLOT 280902
NPWLOT

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
302 AM CST MON DEC 28 2015

...VERY STRONG EAST WINDS ON MONDAY...

ILZ006-014-281800-
/O.CON.KLOT.HW.W.0001.151228T1900Z-151229T0100Z/
LAKE IL-COOK-
INCLUDING THE CITIES OF...WAUKEGAN...CHICAGO
302 AM CST MON DEC 28 2015

...HIGH WIND WARNING REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON
TO 7 PM CST THIS EVENING...

* TIMING...MONDAY EARLY AFTERNOON THROUGH EARLY EVENING.

* WINDS...EAST WINDS SUSTAINED 35 TO 45 MPH...GUSTS UP TO 60 MPH.

* IMPACTS...PROPERTY DAMAGE AND POWER OUTAGES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED
OR OCCURRING. SUSTAINED WIND SPEEDS OF AT LEAST 40 MPH OR GUSTS
OF 58 MPH OR MORE CAN LEAD TO PROPERTY DAMAGE.

&&

$$

ILZ013-021>023-032-033-039-INZ001-002-010-011-019-281800-
/O.CON.KLOT.WI.Y.0009.151228T1500Z-151229T0000Z/
DUPAGE-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-LAKE IN-
PORTER-NEWTON-JASPER-BENTON-
INCLUDING THE CITIES OF...WHEATON...MORRIS...JOLIET...KANKAKEE...
PONTIAC...WATSEKA...PAXTON...GARY...VALPARAISO...MOROCCO...
RENSSELAER...FOWLER
302 AM CST MON DEC 28 2015 /402 AM EST MON DEC 28 2015/

...WIND ADVISORY REMAINS IN EFFECT FROM 9 AM CST /10 AM EST/ THIS
MORNING TO 6 PM CST /7 PM EST/ THIS EVENING...

* TIMING...MONDAY MORNING THROUGH THE LATE AFTERNOON.

* WINDS...EAST WINDS SUSTAINED 25 TO 35 MPH...GUSTS UP TO 50 MPH.

* IMPACTS...MINOR TREE DAMAGE AND DIFFICULT TRAVEL...ESPECIALLY 
  ON NORTH TO SOUTH ROADS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR
GUSTS BETWEEN 45 AND 57 MPH...ARE LIKELY. WINDS THIS STRONG CAN
CAUSE MINOR PROPERTY DAMAGE UNLESS PRECAUTIONS ARE TAKEN. DRIVING
MAY BE DIFFICULT...ESPECIALLY IN HIGH PROFILE VEHICLES. MOTORISTS
SHOULD BE ALERT AND USE CAUTION.

&&

$$

RATZER

433 
WWUS73 KLOT 281640
NPWLOT

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
1040 AM CST MON DEC 28 2015

...VERY STRONG EAST WINDS ON MONDAY...

ILZ006-014-290045-
/O.CON.KLOT.HW.W.0001.151228T1900Z-151229T0100Z/
LAKE IL-COOK-
INCLUDING THE CITIES OF...WAUKEGAN...CHICAGO
1040 AM CST MON DEC 28 2015

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 7 PM CST THIS
EVENING...

* TIMING...EARLY THIS AFTERNOON THROUGH EARLY EVENING.

* WINDS...EAST WINDS SUSTAINED 35 TO 45 MPH...GUSTS UP TO 60 MPH.

* IMPACTS...PROPERTY DAMAGE AND POWER OUTAGES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED
OR OCCURRING. SUSTAINED WIND SPEEDS OF AT LEAST 40 MPH OR GUSTS
OF 58 MPH OR MORE CAN LEAD TO PROPERTY DAMAGE.

&&

$$

ILZ013-021>023-032-033-039-INZ001-002-010-011-019-290000-
/O.CON.KLOT.WI.Y.0009.000000T0000Z-151229T0000Z/
DUPAGE-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-LAKE IN-
PORTER-NEWTON-JASPER-BENTON-
INCLUDING THE CITIES OF...WHEATON...MORRIS...JOLIET...KANKAKEE...
PONTIAC...WATSEKA...PAXTON...GARY...VALPARAISO...MOROCCO...
RENSSELAER...FOWLER
1040 AM CST MON DEC 28 2015 /1140 AM EST MON DEC 28 2015/

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 PM CST /7 PM EST/ THIS
EVENING...

* TIMING...THROUGH LATE THIS AFTERNOON.

* WINDS...EAST WINDS SUSTAINED 25 TO 35 MPH...GUSTS UP TO 50 MPH.

* IMPACTS...MINOR TREE DAMAGE AND DIFFICULT TRAVEL...ESPECIALLY 
  ON NORTH TO SOUTH ROADS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR
GUSTS BETWEEN 45 AND 57 MPH...ARE LIKELY. WINDS THIS STRONG CAN
CAUSE MINOR PROPERTY DAMAGE UNLESS PRECAUTIONS ARE TAKEN. DRIVING
MAY BE DIFFICULT...ESPECIALLY IN HIGH PROFILE VEHICLES. MOTORISTS
SHOULD BE ALERT AND USE CAUTION.

&&

$$

RODRIGUEZ

657 
WWUS73 KLOT 282136
NPWLOT

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
336 PM CST MON DEC 28 2015

ILZ006-014-290100-
/O.CON.KLOT.HW.W.0001.000000T0000Z-151229T0100Z/
LAKE IL-COOK-
INCLUDING THE CITIES OF...WAUKEGAN...CHICAGO
336 PM CST MON DEC 28 2015

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 7 PM CST THIS
EVENING...

* TIMING...EARLY THIS EVENING.

* WINDS...EAST WINDS SUSTAINED 35 TO 45 MPH...GUSTS UP TO 60 MPH.

* IMPACTS...PROPERTY DAMAGE AND POWER OUTAGES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED
OR OCCURRING. SUSTAINED WIND SPEEDS OF AT LEAST 40 MPH OR GUSTS
OF 58 MPH OR MORE CAN LEAD TO PROPERTY DAMAGE.

&&

$$

ILZ013-021>023-032-033-039-INZ001-002-010-011-019-290000-
/O.CON.KLOT.WI.Y.0009.000000T0000Z-151229T0000Z/
DUPAGE-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-LAKE IN-
PORTER-NEWTON-JASPER-BENTON-
INCLUDING THE CITIES OF...WHEATON...MORRIS...JOLIET...KANKAKEE...
PONTIAC...WATSEKA...PAXTON...GARY...VALPARAISO...MOROCCO...
RENSSELAER...FOWLER
336 PM CST MON DEC 28 2015 /436 PM EST MON DEC 28 2015/

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 PM CST /7 PM EST/ THIS
EVENING...

* TIMING...EARLY THIS EVENING.

* WINDS...EAST WINDS SUSTAINED 25 TO 35 MPH...GUSTS UP TO 50 MPH.

* IMPACTS...MINOR TREE DAMAGE AND DIFFICULT TRAVEL...ESPECIALLY 
  ON NORTH TO SOUTH ROADS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR
GUSTS BETWEEN 45 AND 57 MPH...ARE LIKELY. WINDS THIS STRONG CAN
CAUSE MINOR PROPERTY DAMAGE UNLESS PRECAUTIONS ARE TAKEN. DRIVING
MAY BE DIFFICULT...ESPECIALLY IN HIGH PROFILE VEHICLES. MOTORISTS
SHOULD BE ALERT AND USE CAUTION.

&&

$$

RODRIGUEZ

544 
WWUS73 KLOT 282353
NPWLOT

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
553 PM CST MON DEC 28 2015

ILZ013-021>023-032-033-039-INZ001-002-010-011-019-290100-
/O.EXP.KLOT.WI.Y.0009.000000T0000Z-151229T0000Z/
DUPAGE-GRUNDY-WILL-KANKAKEE-LIVINGSTON-IROQUOIS-FORD-LAKE IN-
PORTER-NEWTON-JASPER-BENTON-
INCLUDING THE CITIES OF...WHEATON...MORRIS...JOLIET...KANKAKEE...
PONTIAC...WATSEKA...PAXTON...GARY...VALPARAISO...MOROCCO...
RENSSELAER...FOWLER
553 PM CST MON DEC 28 2015 /653 PM EST MON DEC 28 2015/

...WIND ADVISORY WILL EXPIRE AT 6 PM CST /7 PM EST/ THIS
EVENING...

WINDS ARE DIMINISHING ACROSS THE REGION AS THE CENTER OF THE
SYSTEM LIFTS TO THE NORTH.

$$

ILZ006-014-290100-
/O.CON.KLOT.HW.W.0001.000000T0000Z-151229T0100Z/
LAKE IL-COOK-
INCLUDING THE CITIES OF...WAUKEGAN...CHICAGO
553 PM CST MON DEC 28 2015

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 7 PM CST THIS
EVENING...

* TIMING...EARLY THIS EVENING.

* WINDS...EAST WINDS SUSTAINED 35 TO 45 MPH...GUSTS UP TO 60 MPH.

* IMPACTS...PROPERTY DAMAGE AND POWER OUTAGES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED
OR OCCURRING. SUSTAINED WIND SPEEDS OF AT LEAST 40 MPH OR GUSTS
OF 58 MPH OR MORE CAN LEAD TO PROPERTY DAMAGE.

&&

$$

KREIN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
220 PM CST SUN DEC 27 2015

.UPDATE...

1113 AM CST

HAVE NOT MADE ANY CHANGES YET TO THE HEADLINES FOR MONDAY. DO
ANTICIPATE UPGRADING THE WATCHES TO WARNINGS AND ISSUING
SOME SORT OF WINTER ADVISORY HEADLINE SOUTH OF THE CURRENT WATCH.
WE HOPE TO HAVE UPDATED HEADLINES OUT BY ABOUT 2PM CST. THIS
CONTINUES TO BE AN EXTREMELY CHALLENGING FORECAST WITH PLENTY OF
LINGERING UNCERTAINTY. FORECAST IS VERY DEPENDENT ON TEMPERATURE
TRENDS AT THE SURFACE AND ALOFT...WHICH WILL IMPACT HOW MUCH
PRECIPITATION FALLS IN WHAT TYPE. CONSIDERING HOW STRONG THE EAST
WINDS WILL BE...GUSTING TO 45-50 MPH...IT WILL NOT TAKE MUCH ICE
ACCRETION ON TREES AND POWERLINES TO CAUSE HUGE PROBLEMS. WINDS
LOOK TO BE EVEN STRONGER ONTO THE ILLINOIS SHORE...WITH GUSTS UP
TO 60 MPH OR SO. IN ADDITION TO LARGE BATTERING WAVES CAUSING
POTENTIALLY SIGNIFICANT LAKESHORE FLOODING...THE WINDS COULD BE
STRONG ENOUGH TO CAUSE MINOR WIND DAMAGE THEMSELVES. DID A QUICK
COMPARISON TO THE HALLOWEEN 2014 WIND AND LAKESHORE FLOODING
EVENT...AND THE MINOR LIMITING FACTOR TOMORROW WILL BE SHORTER
FETCH DUE TO EAST WIND DIRECTION ON MONDAY VS. THE DUE NORTH WINDS
IN THE HALLOWEEN '14 EVENT. WILL STILL IN ALL LIKELIHOOD BE
ISSUING A LAKESHORE FLOOD WARNING TOMORROW FOR COOK AND LAKE IL.

IN THE NEAR TERM...DESPITE LOW INVERSION HEIGHTS...THE LONG FETCH
OF NORTH-NORTHEAST WINDS AND SOME LOW LEVEL CONVERGENCE AND LIFT HAS
RESULTED IN FAIRLY WIDESPREAD LAKE EFFECT SHRA. ABOUT AN HOUR
AGO...THERE WERE EVEN A FEW 35 DBZ ECHOES IN THE ACTIVITY...WHICH
HAVE COME DOWN SOME SINCE. HOWEVER...STARTING TO SEE AN UPTICK IN
COVERAGE OF ECHOES AGAIN AS OF THIS WRITING. ADJUSTED POPS UPWARD
TO ACCOUNT FOR THIS ACTIVITY...WHILE LOWERING TO SLIGHT CHANCE OR
LESS IN THE FAR SOUTHERN CWA WITH MUCH OF THE LIGHT RAIN STAYING
SOUTH THROUGH EARLY EVENING.

RC/IZZI

&&

.SHORT TERM...
327 AM CST

TODAY THROUGH MIDNIGHT TONIGHT...

MAIN NEAR TERM FORECAST CONCERN IS WITH A CONTINUING PERIOD OF
MODERATE RAINFALL ACROSS ALREADY-SOAKED SOUTHERN TIER OF CWA
COUNTIES EARLY THIS MORNING...AND ENDING OF PRECIPITATION FROM
NORTHWEST TO SOUTHEAST TODAY. BLUSTERY NORTH WINDS WILL ALSO USHER
IN COOLER TEMPERATURES...WITH LITTLE/NO RISE EXPECTED FROM MORNING
READINGS.

SURFACE LOW PRESSURE WAVE WAS MOVING OUT OF EAST CENTRAL ILLINOIS
INTO INDIANA EARLY THIS MORNING...WITH COLD FRONT SLIDING
SOUTHEAST INTO THE OHIO VALLEY. ORGANIZED PRECIP WAS CONTINUING
WITHIN ELEVATED BAROCLINIC ZONE IN ASSOCIATION WITH MID-LEVEL
DISTURBANCE...THOUGH A EAST-SOUTHEASTWARD SHIFT TO NORTHERN EDGE
NOTED WITH THE STEADIEST RAIN NOW GENERALLY SOUTHEAST OF A PERU-
CHICAGO LINE. HEAVIER CONVECTIVE ELEMENTS HAVE MOVED SOUTHEAST OF
THE CWA...THOUGH RADAR STORM TOTAL PRECIPITATION ESTIMATES
INDICATE 1.50 TO 3.50 INCHES OF RAIN HAVE FALLEN ACROSS THE
SOUTHEASTERN TIER OF COUNTIES SOUTH OF U.S. 24 SINCE SATURDAY
MORNING. RAINFALL RATES HAVE DECREASED MARKEDLY SINCE LATE LAST
EVENING...WITH PERHAPS ANOTHER 0.15 TO 0.25 INCHES POSSIBLE THIS
MORNING. HAD EARLIER ISSUED AN AREAL FLOOD WARNING FOR THIS AREA
WHICH CONTINUES THROUGH 1115 AM...AND A FLASH FLOOD WATCH WILL
REMAIN IN PLACE THROUGH MONDAY WITH ADDITIONAL HEAVY RAINFALL
LIKELY WITH THE NEXT STORM SYSTEM WHICH ARRIVES LATE TONIGHT.

SURFACE HIGH PRESSURE WILL BUILD ACROSS THE NORTHERN PLAINS AND
ACROSS ONTARIO AND THE UPPER MIDWEST THROUGH THIS
EVENING...RESULTING IN A TIGHTENING PRESSURE GRADIENT BETWEEN THE
ADVANCING HIGH AND LOW PRESSURE TROUGHING TO OUR SOUTHEAST.
BLUSTERY NORTH WINDS WILL LIKELY GUST 30-35 MPH ESPECIALLY NEAR
LAKE MICHIGAN AND WAS BEGINNING TO ADVECT COOLER AIR INTO THE
REGION. TEMPERATURES ARE NOT EXPECTED TO RECOVER MUCH AT ALL FROM
EARLY MORNING MID 30S TO AROUND 40 DEGREES.

RATZER

&&

.LONG TERM...
337 AM CST

OVERNIGHT THROUGH TUESDAY...

THE FORECAST THEME FOR THE WINTER WEATHER EVENT LATE TONIGHT INTO
MONDAY CONTINUES TO BE ONE OF STRONG WINDS AND ICING IMPACTS FROM
FREEZING RAIN...WITH ALSO SOME ACCUMULATING SLEET POTENTIAL. THE
WATCH COLLABORATIVELY CONTINUES WITH ANTICIPATED CHANGES TO
ADVISORY AND/OR WARNING NEEDED LATER TODAY...AND LIKELY HEADED
TOWARD AN ADVISORY FOR THE REST OF THE CWA FOR AT LEAST MONDAY
MORNING MINOR ICING. HAVE ALSO EXPANDED THE WATCH TO INCLUDE
LASALLE AND KENDALL COUNTIES BASED ON HIGHER AMOUNTS OF FORECAST
ACCUMULATIONS DURING THE FREEZING RAIN TIME OF THIS EVENT...AND
THUS HIGHER IMPACT ICE ACCUMULATIONS BEING MORE PROBABLE. ALSO
CONCERNS FOR MINOR FLOODING FROM HEAVY TOTAL PRECIPITATION EXIST
ACROSS THE SATURATED AREA.

MODEL GUIDANCE IS IN INCREASINGLY BETTER AGREEMENT WITH THE TRACK OF
THE SYSTEM. WHILE THE GFS CONTINUES TO BE SLIGHTLY FURTHER EAST AND
COOLER...AT LEAST AT 27.00Z...WE CONTINUE TO PREFER THE FURTHER
WEST ECMWF...NAM...AND SEVERAL HIGH RESOLUTION MODELS THAT HAVE
SOLUTIONS AT LEAST INTO MONDAY. THE MAGNITUDE OF QPF HAS INCREASED
AND WPC AND LOCAL WFOS HAVE GONE WITH SLIGHTLY HIGHER QPF...WHICH
YIELDS HIGHER ICE AMOUNTS ESPECIALLY MONDAY MORNING AND EARLY
AFTERNOON. THE KEY DETAILS THAT HAVE SOME SPREAD IN GUIDANCE
REMAIN ON SPECIFIC PRECIPITATION TYPE FROM RATE OF SURFACE
TEMPERATURE WARMING AND DEPTH OF REFREEZE LAYER. BASED ON THE
STRONG EAST-NORTHEAST SURFACE WINDS AND MODEST TO HEAVY
PRECIPITATION RATES ON MONDAY...WE PREFER NULL TEMPERATURE
WARMING IN THE MORNING AND THEN A GRADUAL RISE FROM THE SOUTH IN
THE AFTERNOON THAT ACCELERATES DURING THE MID TO LATE AFTERNOON.

THE DEEP COLD CORE /-32C AT 500MB/ UPPER LEVEL CIRCULATION IS SEEN
ON WATER VAPOR IMAGERY OVER THE RIO GRANDE VALLEY EARLY THIS MORNING
AND WILL EJECT AS A NEGATIVELY TILTED CIRCULATION TONIGHT AND
MONDAY...REACHING THE UPPER GREAT LAKES BY EARLY TUESDAY MORNING.
THIS WILL RIDE WITHIN AND STEER BACK NORTHWARD AN IMPRESSIVELY
STOUT SUBTROPICAL PLUME OF MOISTURE. IT WILL ALSO ASSIST AN
ALREADY TIGHT ELEVATED BAROCLINIC ZONE DOWNSTATE ILLINOIS AND
INDIANA NORTHWARD LATE TONIGHT AS WELL AS RE-ORIENT THIS FORCING
FOCUS MORE EAST-TO-WEST. THE DEVELOPING PRECIPITATION LATE THIS
EVENING AND OVERNIGHT SHOULD FIT THIS ORIENTATION OF THE ELEVATED
WARM FRONT AND INCH ITS WAY NORTHWARD OVERNIGHT AS ELEVATED MOIST
ADVECTION EXPANDS IN DEPTH. TEMPERATURES LOOK TO MORE THAN LIKELY
BE JUST ABOVE FREEZING SOUTH OF I-80 WHEN PRECIPITATION
STARTS...HOWEVER A COUPLE DEGREE DROP SHOULD OCCUR THROUGH WET
BULBING. SO MAINTAIN THE CHANCE FOR FREEZING RAIN ALL THE WAY DOWN
TO THE SOUTHERN FORECAST AREA. FOR THESE SOUTHERN
AREAS...BASICALLY SOUTH OF THE I-80 CORRIDOR...EVEN MONDAY MORNING
SEEMS LIKE IT WOULD NOT HAVE ANY WARMING...SO HAVE MAINTAINED THE
CHANCE FOR FREEZING RAIN THROUGH THE ENTIRE MORNING ACCOUNTING
FOR SOME UNCERTAINTY IN SPECIFIC TEMPERATURE FORECASTS.

FURTHER NORTH...FOR BASICALLY THE INTERSTATE 80 CORRIDOR AND
NORTHWARD...PRECIPITATION LOOKS TO ONSET IN THE PRE-DAWN TO DAYBREAK
TIME...AND MAYBE A COUPLE HOURS AFTER SUNRISE NEAR THE WISCONSIN
BORDER. PRECIPITATION INTENSITY MAY ALSO BE LIGHT FOR A BRIEF WHILE
AT ONSET BUT SHOULD INCREASE FAST MID TO LATE MORNING. SURFACE
TEMPERATURES HERE STILL LOOK TO BE MORE OF THE 29-32 VARIETY AT
ONSET...OUTSIDE OF NEAR THE LAKE AND THE HEART OF THE CHICAGO
METRO...AND MAYBE DROPPING A DEGREE OR TWO WITH THE FREEZING
RAIN/SLEET. THE PROJECTED DEPTH OF THE FREEZING LAYER AT ROCKFORD
IS BETWEEN 3000 TO 5000 FT THROUGH THE MORNING MONDAY BASED ON THE
NAM AND GFS RESPECTIVELY. EVEN THAT NAM DEPTH OFFERS SLEET...OR
MAYBE EVEN SNOW POTENTIAL FOR SEVERAL HOURS AT FIRST. THAT COULD
CHANGE THE MAGNITUDE OF IMPACTS SOME...BUT STILL THINK A
TRANSITION TO MORE OF A FREEZING RAIN WILL OCCUR AS THE MORNING
WEARS ON INTO EARLY AFTERNOON...WITH SEVERAL HOURS BEFORE THE
TRANSITION TO RAIN. THE AREA SOUTH OF ROCKFORD...INCLUDING
DIXON...DEKALB...OTTAWA...MENDOTA...AND ESPECIALLY THE WESTERN
METRO LOOK TO HAVE THE HIGHEST DURATION OF FREEZING RAIN AND THUS
THE HIGHER ICE ACCUMULATIONS THERE. AROUND ONE QUARTER OF AN INCH
IS CURRENTLY FORECAST BUT WITH A FAIRLY LARGE SPREAD POSSIBLE
SINCE WE HAVE QUITE A BIT MORE ACTUAL RAINFALL FORECAST. THE ICE-
TO-LIQUID RATIO IS ALWAYS A FORECAST CHALLENGE AND VARIES BY
SEVERAL ELEMENTS BASED ON CLIMATOLOGY /SOME IN FAVOR DURING THIS
EVENT AND SOME NOT/...AND ICE ACCRETION VARIES SIGNIFICANTLY FROM
FLAT SURFACES TO ELEVATED RADIAL ONES SUCH AS WIRES. THE
SIGNIFICANT EASTERLY WINDS THROUGHOUT MONDAY TIP THE SCALE A
LITTLE BIT TO STRESS IMPACTS OF THE ICING INCLUDING POTENTIAL
POWER OUTAGES.

REGARDING THE WINDS...THE RAPIDLY INCREASING PRESSURE GRADIENT AND
NEAR RECORD ANOMALOUS LOW-LEVEL EASTERLY FLOW STRENGTH...SUPPORTS
AT LEAST NEAR WIND ADVISORY CRITERIA FOR MUCH OF THE CWA WITH
GUSTS TO 40 TO 45 MPH. BOUNDARY LAYER MIXING SUPPORTS THIS USING A
NAM AND GFS MEAN. NEAR LAKE MICHIGAN GUSTS OF 50 TO 55 MPH ARE
POSSIBLE ESPECIALLY DURING THE AFTERNOON AND EVENING. THESE
EASTERLY WINDS TAPPING INTO ALREADY HIGH WAVES FROM TODAY AND
LAKE LEVELS ON THE SOUTHERN PART OF THE LAKE MAY LEAD TO LAKESHORE
FLOODING ALONG THE NORTHEAST ILLINOIS SHORE...INCLUDING SOME
FAVORED IMMEDIATE AREAS ALONG THE CHICAGO SHORE.

THE SYSTEM DRY SLOT LOOKS TO MOVE OVER THE AREA MID TO LATE MONDAY
EVENING TRANSITIONING PRECIP TO MORE LIGHT RAIN AND/OR DRIZZLE.
TEMPERATURES LOOK CONFIDENTLY TO BE ABOVE FREEZING THROUGH THE
ENTIRE AREA BY EARLY EVENING /ONLY EXCEPTION WOULD SEEM TO BE NEAR
ROCKFORD/...HOWEVER ITS CERTAINLY POSSIBLE SOME IMPACTS REMAIN
GIVEN CONTINUED GUSTY WINDS IN THE EARLY TO MID EVENING. THERE IS
SOME CHANCE AS THE COLUMN COOLS TO SEE A LITTLE BIT OF LIGHT SNOW
IN THE WEST DURING THE NIGHT AND MAYBE TUESDAY MORNING...BUT ICE
PRESENCE IN THE CLOUD LOOKS MARGINAL. ANY PRECIPITATION ON TUESDAY
LOOKS TO BE LIGHT.

MTF

WEDNESDAY THROUGH SATURDAY...

A COLDER WEATHER PATTERN WILL EVOLVE FOR THE SECOND HALF OF THE
COMING WEEK...AS HEIGHTS FALL ACROSS THE EASTERN CONUS IN RESPONSE
TO ANOTHER UPPER LOW PROPAGATING NORTHEAST FROM THE PLAINS TO THE
ST LAWRENCE RIVER VALLEY WEDNESDAY-THURSDAY. MUCH DRIER AIR
WRAPPING AROUND THE DEPARTING/WEAKENING SURFACE LOW AT THE
BEGINNING OF THE PERIOD WILL NOT SUPPORT MUCH IN THE WAY OF
SUBSTANTIAL PRECIPITATION DURING THE PERIOD...THOUGH THE STRONG
MID-LEVEL SHORT WAVE AND SECONDARY SURFACE TROUGH/COLD FRONT WHICH
MOVE THROUGH THE AREA ON WEDNESDAY DOES LOOK TO PROVIDE MORE THAN
ADEQUATE FORCING FOR PRODUCING SOME LIGHT PRECIP. FORECAST
SOUNDINGS DEPICT A COLUMN COLD ENOUGH FOR SNOW...PROVIDED BY A
PERIOD OF MID-LEVEL MOISTURE/ICE NUCLEI WITH THE SHORT WAVE.
GUIDANCE QPF GENERALLY ONLY A FEW HUNDREDTHS OF AN
INCH...SUGGESTING ONLY MINOR ACCUMULATION IF ANY...AND THAT
PRIMARILY ORIENTED ACROSS NORTH CENTRAL IL.

COLDER WEATHER THEN SETS IN FOR THE REMAINDER OF THE
PERIOD...WITH WEST-NORTHWEST LOW LEVEL FLOW. FORECAST THERMAL
FIELDS SUPPORT DAYTIME TEMPS IN THE MID-UPPER 20S...AND OVERNIGHT
MINS IN THE TEENS TO LOW 20S. COLDER AIR WILL LIKELY PRODUCE SOME
LIGHT LAKE EFFECT SNOW SHOWERS...THOUGH THE WEST-NORTHWEST FLOW
SHOULD KEEP THIS ACTIVITY MAINLY OVER THE LAKE AND EAST OF THE
CWA.

RATZER

&&

.HYDROLOGY...
104 PM CST

A POWERFUL STORM SYSTEM WILL DRAW COPIOUS AMOUNTS OF MOISTURE
NORTHWARD ON MONDAY. SOME OF THE PRECIPITATION WILL FALL AS SLEET
AND FREEZING RAIN. TOTAL FORECAST LIQUID EQUIVALENT AMOUNTS ARE IN
THE 1 TO 1.5 INCH RANGE ACROSS NORTHERN AND CENTRAL ILLINOIS AND
NORTHWEST INDIANA. WITH SUCH ANOMALOUSLY HIGH MOISTURE
LEVELS...LOCALLY HIGHER TOTALS ARE PROBABLE. 24-HOUR RAIN AMOUNTS
FROM SATURDAY INTO SUNDAY MORNING WERE UP TO 2-3 INCHES SOUTH OF
THE KANKAKEE RIVER. THIS RAIN HAS ALREADY RESULTED IN RISES ON
RIVERS AND STREAMS IN THIS AREA. THE ADDITIONAL RAIN ON MONDAY
WILL EXACERBATE AND PROLONG ONGOING RISES. FOR AREAS FARTHER
NORTH...RIVER AND STREAM LEVELS ARE ALREADY RUNNING ABOVE
NORMAL...AND THE HEAVY FORECAST PRECIPITATION WILL RESULT IN
RENEWED RISES.

RC

&&

.AVIATION...

//ORD AND MDW CONCERNS...UPDATED 20Z...

* LAKE INDUCED RAIN SHOWERS AND DRIZZLE CONTINUE TO DIMINISH.
  MVFR CIGS CONTINUE THROUGHOUT THE REST OF THE AFTERNOON.
* N WINDS TURNING NNE WITH GUSTS 25-28 KT THROUGH THE REST OF
  AFTERNOON AND NIGHT...WITH A BIT OF A LULL IN THE EVENING.
  WINDS TURNING E ON MONDAY WITH GUSTS 30-35 KT IN THE MORNING...
  AND GUSTS 35-40 KT IN THE AFTERNOON.
* SLEET AND FREEZING RAIN OVERSPREAD ORD-MDW AROUND 13Z MONDAY...
  PATCHY LIGHT SNOW AND FREEZING DRIZZLE POSSIBLE AHEAD OF THE
  MAIN PRECIPTATION AREA IN THE 10-12Z TIME FRAME FROM SOUTH TO
  NORTH.

ED F

//DISCUSSION...UPDATED 18Z...

WINTRY MIXED PRECIPITATION EVENT WILL MOVE INTO THE TERMINAL AREAS
AROUND SUNRISE MONDAY (13-14Z) WITH A 6-8 HOUR PERIOD OF SLEET
AND FREEZING RAIN EXPECTED DURING THE MORNING INTO EARLY
AFTERNOON. PRECIPITATION TYPE WILL CHANGE TO PLAIN RAIN AROUND MID
AFTERNOON ON MONDAY WITH RAIN CONTINUING OVERNIGHT MONDAY NIGHT.
SLEET MAY ACCUMULATE UP TO 1/4 TO 1/2 INCH AND ICE MAY ACCUMULATE
UP TO A TENTH OF AN INCH BEFORE PRECIPITATION CHANGES OVER TO RAIN
DURING THE MID AFTERNOON. INTERESTS SHOULD MONITOR LATER FORECASTS
AS SMALL CHANGES IN EXPECTED TEMPERATURES BOTH SURFACE AND ALOFT
CAN RESULT IN SIGNIFICANT CHANGES IN EXPECTED PRECIPITATION TYPE
AND HENCE IMPACTS.

WINDS WILL STAY STRONG THIS AFTERNOON AND INCREASE MONDAY AS
STRONG LOW PRESSURE MOVES TOWARD THE AREA. GUSTS AS HIGH AS 40 KT
MAY BE EXPERIENCED MONDAY AT THE TERMINALS.

ED F

//ORD AND MDW CONFIDENCE...UPDATED 20Z...

* HIGH CONFIDENCE IN GENERAL CIGS TREND.
* HIGH CONFIDENCE IN WINDS.
* HIGH CONFIDENCE IN A PERIOD OF MIXED PRECIP MONDAY... MEDIUM TO
  HIGH CONFIDENCE IN TIMING.

ED F

//OUTLOOK FOR ORD/MDW FOR 00Z TUESDAY-12Z SUNDAY...UPDATED 12Z...

MONDAY NIGHT...E WINDS TURNING S THEN SW OVERNIGHT. -RA TURNING TO -
DZ OVERNIGHT.

TUESDAY...MVFR CIGS...ESPECIALLY EARLY. SW WINDS. LIGHT RAIN/SNOW
MIX POSSIBLE.

WEDNESDAY...MVFR CIGS. CHANCE -SN WITH IFR POSSIBLE. SW WINDS.

THURSDAY...MVFR CIGS POSSIBLE. W WINDS.

FRIDAY...VFR PROBABLE. W WINDS.

SATURDAY...MVFR PSBL. W WINDS TURNING NW.

KMD

&&

.MARINE...
104 PM CST

A POWERFUL LOW PRESSURE AREA WILL LIFT NORTHWARD THROUGH MISSOURI
AND NEAR OR ALONG THE MISSISSIPPI RIVER VALLEY ON MONDAY. STRONG
1040+ MB HIGH PRESSURE SPREADING IN FROM THE NORTHERN PLAINS
ALREADY RESULTING IN NORTHERLY WINDS UP TO 30 KT ON THE LAKE TODAY
WILL SLIDE EAST TO JUST NORTH OF THE GREAT LAKES ON MONDAY. THE
EXTREMELY TIGHT PRESSURE GRADIENT BETWEEN THE APPROACHING LOW
PRESSURE AND STRONG HIGH PRESSURE WILL RESULT IN EXTREMELY STRONG
EASTERLY WINDS...STARTING ON THE SOUTHERN PART OF THE LAKE AND
THEN SPREADING NORTHWARD MONDAY EVENING AND NIGHT. WILL BE
UPGRADING THE CURRENT STORM WATCH TO A WARNING FOR THE SOUTH HALF
OPEN WATERS AND ILLINOIS NEARSHORE...WHERE THE EASTERLY FETCH WILL
ALSO YIELD PEAK WAVE HEIGHTS OF 15-20 FT OR SO. WILL ALSO UPGRADE
GALE WATCH FOR NORTH HALF AND INDIANA NEARSHORE TO A WARNING.
WINDS/GUSTS MAY FLIRT WITH STORM FORCE ON THE NORTH HALF MONDAY
EVENING INTO THE EARLY PART OF THE OVERNIGHT AND LATER SHIFTS MAY
NEED TO CONSIDER UPGRADING TO A BRIEF STORM WARNING FOR THIS.

WINDS WILL SHIFT TO SOUTHERLY AND DIMINISH MONDAY NIGHT ON THE
SOUTHERN PART OF THE LAKE AS LOW PRESSURE TRACKS NEAR OR JUST WEST
OF THE LAKE...WHILE STRONG EASTERLY WINDS CONTINUE FOR NORTHERN
LAKE MICHIGAN. AFTER THE WEAKENING LOW SHIFTS NORTH OF THE LAKE ON
TUESDAY...MODERATE WESTERLY FLOW WILL SET UP OVER THE LAKE FOR THE
SECOND HALF OF THE WEEK INTO THE WEEKEND.

RC

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...WINTER STORM WATCH...ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-
     ILZ011-ILZ012-ILZ019-ILZ020...6 AM MONDAY TO 6 PM MONDAY.

     LAKESHORE FLOOD WATCH...ILZ006-ILZ014...9 AM MONDAY TO 9 PM
     MONDAY.

     FLASH FLOOD WATCH...ILZ033-ILZ039 UNTIL 6 PM MONDAY.

IN...FLASH FLOOD WATCH...INZ010-INZ011-INZ019 UNTIL 6 PM MONDAY.

LM...SMALL CRAFT ADVISORY...NEARSHORE WATERS
     UNTIL 6 AM MONDAY.

     STORM WATCH...LMZ740-LMZ741-LMZ742-LMZ777-LMZ779...6 AM MONDAY
     TO MIDNIGHT TUESDAY.

     GALE WARNING...LMZ743-LMZ744-LMZ745...6 AM MONDAY TO MIDNIGHT
     TUESDAY.

&&

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HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1116 AM CST SUN DEC 27 2015

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
281730-
WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE-
DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-
IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON-
1116 AM CST SUN DEC 27 2015 /1216 PM EST SUN DEC 27 2015/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

WATER LEVELS REMAIN ELEVATED ON MANY AREA CREEKS AND RIVERS.

LIGHT FREEZING RAIN OR SLEET IS LIKELY OVERNIGHT...MAINLY SOUTH
OF INTERSTATE 80.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

ANOTHER STORM SYSTEM WILL MOVE OVER THE AREA MONDAY...WITH THE
LIKELIHOOD FOR A MIX OF SLEET AND FREEZING RAIN THAT WILL LIKELY
TRANSITION TO ALL RAIN FROM SOUTH TO NORTH ON MONDAY AFTERNOON.
THOUGH THERE REMAINS SOME UNCERTAINTY ON DURATION AND AMOUNT OF
ICING...IT APPEARS THAT AT LEAST MINOR ICE ACCUMULATIONS ARE
LIKELY ACROSS A GOOD PART OF THE OUTLOOK AREA...AND SIGNIFICANT
ACCUMULATIONS POSSIBLE OVER MAINLY NORTH CENTRAL ILLINOIS.

WATER LEVELS WILL REMAIN ELEVATED ON AREA RIVERS AND CREEKS AND
LIKELY RISE MIDWEEK. LOCALIZED FLOODING WILL ALSO BE POSSIBLE
MONDAY AND MONDAY EVENING DUE TO HEAVY RAINFALL ON SATURATED
GROUND.

IN ADDITION TO THE PRECIPITATION...THIS STORM SYSTEM WILL PRODUCE
STRONG WINDS GUSTING TO 45 TO 55 MPH MONDAY AND MONDAY EVENING.
GUSTS TO 50 TO 60 MPH ARE EXPECTED ALONG THE IMMEDIATE NORTHEAST
ILLINOIS LAKE SHORE...WHICH WILL LIKELY LEAD TO LAKESHORE FLOODING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.

&&

LMZ740>745-281730-
WINTHROP HARBOR TO WILMETTE HARBOR-
WILMETTE HARBOR TO NORTHERLY ISLAND-
NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY-
GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY-
1116 AM CST SUN DEC 27 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE
WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE
MICHIGAN.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

STRONG WINDS AND HIGH WAVES WILL LEAD TO HAZARDOUS CONDITIONS FOR
SMALL CRAFT THROUGH TONIGHT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

A PERIOD OF HIGH END GALES IS EXPECTED MONDAY AND MONDAY EVENING.
STORM FORCE WINDS OR AT LEAST GUSTS ALSO ARE POSSIBLE ON MONDAY
AFTERNOON AND EVENING...ESPECIALLY FOR THE ILLINOIS NEARSHORE
WATERS.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-281730-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE
MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH
FOX ISLAND 5 NM OFFSHORE-
LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI-
LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE
TO MID LAKE-
LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO
MID LAKE-
1116 AM CST SUN DEC 27 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

EAST GALE FORCE WINDS ARE LIKELY FROM EARLY MONDAY THROUGH
MONDAY EVENING ON THE SOUTHERN PART OF THE LAKE...AND MONDAY
AFTERNOON AND MONDAY NIGHT IN THE NORTH. STORM FORCE GUSTS ALSO
ARE POSSIBLE MONDAY AFTERNOON AND EVENING FOR THE SOUTHERN PART
OF THE LAKE.

&&

RC

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