Storm Warning 1, NWS Chicago, IL

472 
WHUS73 KLOT 030352
MWWLOT

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
952 PM CST FRI MAR 2 2012

LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-031200-
/O.CON.KLOT.SR.W.0001.000000T0000Z-120303T0900Z/
/O.CON.KLOT.GL.W.0018.120303T0900Z-120303T2100Z/
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 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-
952 PM CST FRI MAR 2 2012

...STORM WARNING REMAINS IN EFFECT UNTIL 3 AM CST SATURDAY...
...GALE WARNING REMAINS IN EFFECT FROM 3 AM TO 3 PM CST
SATURDAY...

* WINDS...NORTHWEST STORM FORCE TO 50 KT DIMINISHING TO WEST GALES
  TO 45 KT OVERNIGHT.

* WAVES...14 TO 18 FT. OCCASIONAL WAVES TO 24 FT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR
OCCURRING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.

A STORM WARNING MEANS WINDS OF 48 TO 63 KNOTS ARE IMMINENT OR
OCCURRING. RECREATIONAL BOATERS SHOULD REMAIN IN PORT...OR TAKE
SHELTER UNTIL WINDS AND WAVES SUBSIDE. COMMERCIAL VESSELS SHOULD
PREPARE FOR VERY STRONG WINDS AND DANGEROUS SEA CONDITIONS...AND
CONSIDER REMAINING IN PORT OR TAKING SHELTER IN PORT UNTIL WINDS
AND WAVES SUBSIDE.

&&

$$

LMZ744-745-031200-
/O.CON.KLOT.SR.W.0001.000000T0000Z-120303T0900Z/
/O.CON.KLOT.GL.W.0017.120303T0900Z-120303T1500Z/
GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY-
952 PM CST FRI MAR 2 2012

...STORM WARNING REMAINS IN EFFECT UNTIL 3 AM CST SATURDAY...
...GALE WARNING REMAINS IN EFFECT FROM 3 AM TO 9 AM CST
SATURDAY...

* WINDS...WEST STORM FORCE TO 50 KT DIMINISHING TO GALES TO 40 KT
  OVERNIGHT.

* WAVES...10 TO 14 FT. OCCASIONAL WAVES TO 20 FT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WINDS OF 22 TO 33 KNOTS AND/OR
WAVES GREATER THAN 4 FT WILL PRODUCE HAZARDOUS WAVE CONDITIONS
FOR SMALL CRAFT. INEXPERIENCED MARINERS...ESPECIALLY THOSE
OPERATING SMALLER VESSELS SHOULD AVOID NAVIGATING IN THESE
CONDITIONS.

A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR
OCCURRING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.

A STORM WARNING MEANS WINDS OF 48 TO 63 KNOTS ARE IMMINENT OR
OCCURRING. RECREATIONAL BOATERS SHOULD REMAIN IN PORT...OR TAKE
SHELTER UNTIL WINDS AND WAVES SUBSIDE. COMMERCIAL VESSELS SHOULD
PREPARE FOR VERY STRONG WINDS AND DANGEROUS SEA CONDITIONS...AND
CONSIDER REMAINING IN PORT OR TAKING SHELTER IN PORT UNTIL WINDS
AND WAVES SUBSIDE.

&&

$$

LMZ261-362-364-366-563-565-031200-
/O.CON.KLOT.GL.W.0016.000000T0000Z-120303T2100Z/
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-
952 PM CST FRI MAR 2 2012

...GALE WARNING REMAINS IN EFFECT UNTIL 3 PM CST SATURDAY...

* WINDS...NORTH GALES TO 35 KT INCREASING TO NORTHWEST GALES TO 45
  KT OVERNIGHT.

* WAVES...12 TO 16 FT. OCCASIONAL WAVES TO 22 FT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR
OCCURRING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.

&&

$$

LMZ740>743-031200-
/O.CON.KLOT.GL.W.0016.000000T0000Z-120303T1500Z/
WINTHROP HARBOR TO WILMETTE HARBOR-
WILMETTE HARBOR TO NORTHERLY ISLAND-
NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY-
952 PM CST FRI MAR 2 2012

...GALE WARNING REMAINS IN EFFECT UNTIL 9 AM CST SATURDAY...

* WINDS...WEST GALES TO 45 KT DIMINISHING TO 35 KT OVERNIGHT.

* WAVES...7 TO 10 FT. OCCASIONAL WAVES TO 14 FT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WINDS OF 22 TO 33 KNOTS AND/OR
WAVES GREATER THAN 4 FT WILL PRODUCE HAZARDOUS WAVE CONDITIONS
FOR SMALL CRAFT. INEXPERIENCED MARINERS...ESPECIALLY THOSE
OPERATING SMALLER VESSELS SHOULD AVOID NAVIGATING IN THESE
CONDITIONS.

A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR
OCCURRING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.

&&

$$

517 
WHUS73 KLOT 030901
MWWLOT

URGENT - MARINE WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHICAGO IL
301 AM CST SAT MAR 3 2012

LMZ080-567-669-671-673-675-777-779-868-870-872-874-876-878-031715-
/O.EXP.KLOT.SR.W.0001.000000T0000Z-120303T0900Z/
/O.CON.KLOT.GL.W.0018.000000T0000Z-120303T2100Z/
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 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-
301 AM CST SAT MAR 3 2012

...GALE WARNING REMAINS IN EFFECT UNTIL 3 PM CST THIS AFTERNOON...
...STORM WARNING WILL EXPIRE AT 3 AM CST EARLY THIS MORNING...

* WINDS...WEST GALES TO 40 KT.

* WAVES...12 TO 16 FT. OCCASIONAL WAVES TO 24 FT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR
OCCURRING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.

&&

$$

LMZ744-745-031500-
/O.EXP.KLOT.SR.W.0001.000000T0000Z-120303T0900Z/
/O.CON.KLOT.GL.W.0017.000000T0000Z-120303T1500Z/
GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY-
301 AM CST SAT MAR 3 2012

...GALE WARNING REMAINS IN EFFECT UNTIL 9 AM CST THIS MORNING...
...STORM WARNING WILL EXPIRE AT 3 AM CST EARLY THIS MORNING...

* WINDS...WEST WINDS TO 35 KT.

* WAVES...8 TO 12 FT. OCCASIONAL WAVES TO 16 FT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR
OCCURRING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.

&&

$$

LMZ261-362-364-366-563-565-031715-
/O.EXT.KLOT.GL.W.0016.000000T0000Z-120303T1800Z/
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-
301 AM CST SAT MAR 3 2012

...GALE WARNING NOW IN EFFECT UNTIL NOON CST TODAY...

* WINDS...NORTHWEST GALES TO 35 KT.

* WAVES...8 TO 12 FT. OCCASIONAL WAVES TO 16 FT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR
OCCURRING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.

&&

$$

LMZ740>743-031500-
/O.CON.KLOT.GL.W.0016.000000T0000Z-120303T1500Z/
WINTHROP HARBOR TO WILMETTE HARBOR-
WILMETTE HARBOR TO NORTHERLY ISLAND-
NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY-
301 AM CST SAT MAR 3 2012

...GALE WARNING REMAINS IN EFFECT UNTIL 9 AM CST THIS MORNING...

* WINDS...WEST GALES TO 35 KT.

* WAVES...5 TO 8 FT. OCCASIONAL WAVES TO 12 FT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SMALL CRAFT ADVISORY MEANS THAT WINDS OF 22 TO 33 KNOTS AND/OR
WAVES GREATER THAN 4 FT WILL PRODUCE HAZARDOUS WAVE CONDITIONS
FOR SMALL CRAFT. INEXPERIENCED MARINERS...ESPECIALLY THOSE
OPERATING SMALLER VESSELS SHOULD AVOID NAVIGATING IN THESE
CONDITIONS.

A GALE WARNING MEANS WINDS OF 34 TO 47 KNOTS ARE IMMINENT OR
OCCURRING. OPERATING A VESSEL IN GALE CONDITIONS REQUIRES
EXPERIENCE AND PROPERLY EQUIPPED VESSELS. IT IS HIGHLY
RECOMMENDED THAT MARINERS WITHOUT THE PROPER EXPERIENCE SEEK SAFE
HARBOR PRIOR TO THE ONSET OF GALE CONDITIONS.

&&

$$

MTF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
223 PM CST FRI MAR 2 2012

.DISCUSSION...
210 PM CST

.SHORT TERM...TONIGHT THROUGH MONDAY...

A VERY DYNAMIC EARLY SPRING STORM SYSTEM IS CURRENTLY LIFTING
NORTHEASTWARD ACROSS EAST CENTRAL ILLINOIS EARLY THIS AFTERNOON. THE
SEVERE WEATHER THREAT HAS REMAINED JUST SOUTH OF MY AREA THIS
AFTERNOON. THE MAIN ATTENTION IS NOW SHIFTING TO THREAT FOR HEAVY
SNOW ACROSS FAR NORTHERN ILLINOIS...AND THE THREAT FOR SOME VERY
STRONG WINDS ACROSS EAST CENTRAL ILLINOIS AND NORTHWEST INDIANA BY
THIS EVENING.

A VERY IMPRESSIVE BAND OF HEAVY SNOW HAS DEVELOPED OVER THE PAST
FEW HOURS ACROSS EASTERN IOWA. THIS BAND OF SNOW IS ASSOCIATED WITH
A STRONG BAND OF MID LEVEL FRONTOGENESIS WITHIN A TROWAL FEATURE TO
THE NORTH AND WEST OF THE SURFACE LOW. THIS IS ACTING AS THE
PRIMARILY FOCUS FOR THIS HEAVY SNOW WITHIN THE LEFT EXIT REGION OF A
130+ KT UPPER LEVEL JET. THE LATEST GUIDANCE SUGGESTS
THAT THIS TROWAL FEATURE WILL QUICKLY LIFT NORTHEASTWARD ACROSS
NORTH CENTRAL ILLINOIS AND SOUTHEASTERN WI LATE THIS AFTERNOON AND
EVENING. THIS MOVEMENT WILL FAVOR THE AREA FOR THE HEAVIEST SNOW
ACROSS NORTH CENTRAL AND PORTIONS OF NORTHEASTERN ILLINOIS THROUGH
THIS EVENING. THERE IS STILL SOME UNCERTAINTY ON HOW QUICKLY THE
TRANSITION TO SNOW WILL ACROSS ACROSS NORTHEASTERN ILLINOIS.
HOWEVER...IT STILL APPEARS POSSIBLE FOR A QUICK TRANSITION BY EARLY
EVENING AS STRONG DYNAMICAL COOLING OCCURS.

WE UPDATED THE WATCH AREA TO A WARNING THIS MORNING AND ALSO ADDED A
WINTER WEATHER ADVISORY JUST TO THE SOUTH OF THE WARNING. I AM
EXPECTING 4 TO 7 INCHES WITHIN THE HEAVIEST BAND OF SNOW.  THE
SYSTEM IS MOVING QUICK...SO MUCH OF THIS SNOW WILL FALL WITHIN A 4
TO 6 HOUR PERIOD. THE INCREASING THREAT FOR THUNDERSNOW LATE THIS
AFTERNOON AND EVENING SHOULD ALLOW FOR SNOWFALL OF THESE AMOUNTS TO
FALL WITHIN A SHORT WINDOW. THERE HAVE EVEN ALREADY BEEN SEVERAL
AREAS OF LIGHTNING WITHIN THIS BAND OF RAIN AND SNOW OUT WEST. THIS
CONVECTIVE NATURE WILL LIKELY LEAD TO 1 TO 2 INCH PER HOUR RATES AT
TIMES...ESPECIALLY ACROSS NORTH CENTRAL ILLINOIS.
BECAUSE OF THESE HEAVY SNOW RATES OCCURRING DURING PORTIONS OF THE
AFTERNOON AND EVENING RUSH...WE FELT IT PRUDENT TO UPGRADE THE WATCH
TO A WARNING THIS MORNING. THIS BAND OF SNOW WILL LIFT ACROSS
NORTHEASTERN ILLINOIS THIS EVENING BEFORE QUICKLY EXITING THE AREA
LATER THIS EVENING. SOME ADDITIONAL ACCUMULATIONS ARE POSSIBLE THIS
EVENING...PRIMARILY ACROSS FAR NORTHEASTERN ILLINOIS. IT APPEARS THE
BEST CHANCES FOR SNOW ACCUMULATION WILL REMAIN MAINLY ALONG AND NORTH
OF I 88 IN NORTHEASTERN ILLINOIS.

THE OTHER MAJOR CONCERN THIS EVENING IS THE WINDS...ESPECIALLY
ACROSS EAST CENTRAL ILLINOIS AND NORTHWEST INDIANA. AS THE LOW LIFTS
NORTHEAST AND RAPIDLY DEEPENS ACROSS LOWER MICHIGAN THIS EVENING
THERE WILL BE STRONG ISALLOBARIC PRESSURE RISES IN ITS WAKE. THE
LATEST GUIDANCE SUGGESTS UP TO A 13 MB PRESSURE RISE IN A 6 HOUR
PERIOD THIS EVENING ACROSS EAST CENTRAL ILLINOIS AND NORTHWEST
INDIANA. THIS COMBINED WITH A STRONG PUSH OF COLDER AIR BEHIND THE
SYSTEM SHOULD RESULT IN A PERIOD OF STRONG WESTERLY WINDS DEVELOPING
LATE THIS AFTERNOON AND THIS EVENING. OVERALL THE STRONGEST WINDS
WILL BE ACROSS MY FAR SOUTHEASTERN COUNTIES...WHERE WINDS OF 20 TO
30 MPH WITH GUSTS UP TO 50 MPH ARE EXPECTED THROUGH THIS EVENING. I
WOULD NOT BE SURPRISED TO SEE A FEW GUSTS UP TO 55 MPH EARLY THIS
EVENING AS THE COLD AIR QUICKLY SPILLS IN ACROSS THIS REGION. BUFFER
SOUNDINGS INDICATE UP TO 48 KT AT THE TOP OF THE MIXING LAYER THAT
COULD MIX DOWN WITH THIS COLD AIR ADVECTION AND STRONG PRESSURE
RISES.

BECAUSE OF THE ABOVE MENTIONED CONCERNS A WIND ADVISORY WAS ALSO
ISSUED FOR THE SOUTHEASTERN SECTIONS OF MY AREA THIS MORNING. THIS
IS IN EFFECT FROM 4 PM THIS AFTERNOON THROUGH 12 PM CST TONIGHT.

ANOTHER MID LEVEL DISTURBANCE WILL DROP SOUTHEASTWARD FROM THE UPPER
MISSISSIPPI RIVER VALLEY ON SATURDAY AS CYCLONIC FLOW ALOFT
CONTINUES. THIS WILL COMBINE WITH SOME STEEP LOW LEVEL LAPSE RATES
TO LEAD TO SOME SNOW SHOWERS ACROSS NORTHERN ILLINOIS DURING THE
AFTERNOON ON SATURDAY. A SECONDARY COLD FRONT WILL DROP SOUTH ACROSS
LAKE MICHIGAN SATURDAY NIGHT. THE AIRMASS MOVING ACROSS LAKE
MICHIGAN BEHIND THIS FRONT WILL SET UP SOME FAVORABLE THERMODYNAMICS
FOR SOME LAKE EFFECT/LAKE ENHANCED SNOW SHOWERS ON SUNDAY AND SUNDAY
NIGHT. THEREFORE...I PLAN ON HOLDING ON TO THE CHANCE POPS DURING
THIS PERIOD. THERE COULD BE SOME ACCUMULATIONS FROM THIS ACTIVITY.

KJB

.LONG TERM...MONDAY NIGHT THROUGH FRIDAY...

COMING SOON.

&&

.AVIATION...

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

* DETERIORATING IFR CIGS IN RAIN THIS AFTERNOON.

* POTENTIAL FOR A BRIEF PERIOD OF THUNDER THRU ABOUT 22Z...WITH
  SOME GRAUPEL/SOFT HAIL IN CONVECTIVE SHOWER CORES.

* PRECIPITATION CHANGING TO WET SNOW 22-24Z...WITH LIFR/VLIFR
  CONDITIONS LIKELY IN A PERIOD OF MODERATE/HEAVY WET SNOW INTO
  EARLY EVENING.

* NORTHEAST WINDS BACKING TO WEST-NORTHWEST DURING THE LATE
  AFTERNOON AND EVENING...WITH GUSTS INCREASING TO AROUND 30 KTS
  AND CONTINUING FROM THE WEST OVERNIGHT. WEST WINDS GUSTING 25
  KTS SATURDAY.

* POTENTIAL FOR SNOW SHOWERS WITH MVFR CEILINGS SATURDAY.

RATZER

//DISCUSSION...UPDATED 20Z...

AREA OF ELEVATED CONVECTION HAS DEVELOPED OVER NORTHEAST IL AT
20Z...WITH HIGHEST CONCENTRATION FROM VYS-MDW CORRIDOR. LOOKS LIKE
THIS WILL BE THRU THE TERMINAL AIRSPACE PRIOR TO 22Z...BUT MAY
PRODUCE SOME LIGHTNING/SMALL HAIL FOR THE NEXT 1-1.5 HOURS
ESPECIALLY FOR MDW/GYY. FARTHER WEST...DEFORMATION BAND SNOW STILL
ADVANCING ACROSS NORTHWEST/NORTH CENTRAL IL...WITH RFD CHANGING
OVER TO ALL SNOW RECENTLY. STRONG FORCING AND AMPLE MOISTURE STILL
SUGGESTS THE POSSIBILTY FOR A 2-3 HOUR PERIOD OF MODERATE/HEAVY
WET SNOW INTO EARLY THIS EVENING...WITH MANY 1/4-1/2SM VSBY OBS
FROM MLI NORTHEAST TO MSN AT 20Z.

RATZER

PREVIOUS DISCUSSION FROM 18Z...

SEVERAL AVIATION WEATHER CONCERNS THIS AFTERNOON INTO SATURDAY AS
STRONG LOW PRESSURE SYSTEM OVER DOWNSTATE ILLINOIS CONTINUES TO
DEEPEN RAPIDLY THIS AFTERNOON...AND MOVING QUICKLY NORTHEAST INTO
LOWER MICHIGAN THIS EVENING. DETERIORATING CEILING/VIS WITH RAIN
CHANGING TO A BRIEF PERIOD OF HEAVY WET SNOW TOWARD EVENING...AND
NORTHEAST WINDS SHIFTING NORTHWEST-WEST AND GUSTING AROUND 30 KTS
ARE THE MAIN PROBLEMS.

WITH LOW LIFTING NORTHEAST THROUGH THE REGION AT MIDDAY... AREA
OF STRONG THUNDERSTORMS OVER SOUTHEAST ILLINOIS AND CENTRAL AND
NORTHERN INDIANA WILL CONTINUE TO MOVE OFF TO THE EAST/SOUTHEAST
OF THE TERMINALS THROUGH EARLY AFTERNOON. FARTHER WEST...
DEVELOPING DEFORMATION PRECIPITATION AXIS FROM NORTHEAST MO INTO
NORTHWEST IL/SOUTHWEST WI IS THE AREA TO WATCH FOR LATER THIS
AFTERNOON. VERY STRONG/DEEP ASCENT DEVELOPING WITH THIS SYSTEM IS
EXPECTED TO RESULT IN THIS AREA OF PRECIPITATION EXPANDING AND
SHIFTING EAST ACROSS THE AREA THROUGH EARLY THIS EVENING. MORNING
HRRR RUNS SEEM TO BE VERIFYING FAIRLY WELL...WITH NEW DEVELOPMENT
ON LEADING EDGE FROM KUIN-KSQI LAST HOUR OR TWO...AND THIS
EXPECTED TO SPREAD NORTHEAST OVER THE NEXT SEVERAL HOURS. FORECAST
SOUNDINGS CONTINUE TO INDICATE PRECIPITATION WILL INITIALLY FALL
AS RAIN AS LOW LEVELS ARE MOIST/ABOVE FREEZING...THOUGH MODELS
REMAIN CONSISTENT IN DEPICTING QUICK COOLING OF COLUMN DURING LATE
AFTERNOON HOURS WITH PRECIPITATION EXPECTED TO CHANGE OVER TO WET
SNOW. THIS ALREADY OCCURRING OVER FAR EASTERN IOWA...WITH SEVERAL
METAR OBS SHOWING 1/4-1/2SM VISIBILITIES IN A NARROW BAND OF
MODERATE TO HEAVY SNOW JUST WEST OF THE MISSISSIPPI RIVER AT 18Z.
EXPECT THIS TO SPREAD INTO KRFD LATE AFTERNOON...AND CHICAGO
TERMINALS TOWARD EVENING...WITH THE POTENTIAL FOR A 2-3 HOUR
PERIOD OF LIFR/VLIFR VIS/CIG IN SNOW. GOOD NEWS IS THAT THIS
SYSTEM IS MOVING QUICKLY...WITH RATHER NARROW DEFORMATION BAND OF
SNOW EXPECTED TO LIFT NORTHEAST OF AREA BY MID-LATE EVENING. NOT
MUCH IN THE WAY OF CLOUD COVER UPSTREAM BEHIND DEFORMATION BAND...
THOUGH COLD ADVECTION AND STEEPENING LOW LEVEL LAPSE RATES MAY
SUPPORT SCT/BKN MVFR CIGS INTO THE OVERNIGHT HOURS. DIURNAL
INCREASE IN LOW LEVEL INSTABILITY SATURDAY MORNING...COMBINED WITH
ANOTHER MID-LEVEL DISTURBANCE SPREADING OVER THE AREA WILL LIKELY
SUPPORT SOME SCATTERED SNOW SHOWERS/FLURRIES WITH AT LEAST A
BROKEN MVFR CEILING DURING THE DAY SATURDAY.

ENOUGH ELEVATED INSTABILITY DOES APPEAR TO EXIST DURING THE
MID/LATE AFTERNOON HOURS AHEAD OF MAIN MID-LEVEL WAVE TO SUPPORT
ISOLATED THUNDERSTORMS OVER THE CHICAGO AREA TERMINALS...THROUGH
CONFIDENCE AND ANTICIPATED COVERAGE IS TOO LOW FOR TAF INCLUSION
OTHER THAN A CB MENTION AT GYY. GREATER THREAT FOR TSRA EXPECTED
TO BE SOUTH/SOUTHEAST OF IMMEDIATE CHI TERMINALS.

WINDS WILL BE THE OTHER BIG CONCERN THROUGH THIS FORECAST PERIOD.
NORTHEAST WINDS WITH GUSTS AROUND 20 KTS THIS AFTERNOON WITH
SURFACE LOW CENTER TO OUR SOUTH...WILL SHIFT TO THE NORTHWEST AND
EVENTUALLY MORE WEST-NORTHWEST DURING THE VERY LATE AFTERNOON AND
EARLY EVENING HOURS...THEN MAINTAIN A WESTERLY DIRECTION OVERNIGHT
AND SATURDAY. DEEPENING OF THE SURFACE LOW THIS AFTERNOON/EVENING
WILL LEAD TO A RAPID TIGHTENING OF THE PRESSURE GRADIENT...WHICH
ALONG WITH STEEPENING LOW LEVEL LAPSE RATES WILL COMBINE TO
PRODUCE VERY WINDY CONDITIONS. SUSTAINED SPEEDS NEAR 20 KTS AND
GUSTS TO/ABOVE 30 KTS EXPECTED BY EARLY-MID EVENING FROM THE
NORTHWEST-WEST...GRADUALLY TAPERING TO 15-25 KTS BY SATURDAY
MORNING.

RATZER

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

* HIGH CONFIDENCE OF DETERIORATING TO IFR/LIFR BY EVENING. MEDIUM-
  HIGH CONFIDENCE OF A BRIEF 2-3 HOUR PERIOD OF LIFR IN SNOW INTO
  EARLY EVENING.

* HIGH CONFIDENCE IN TSRA IN TERMINAL AIRSPACE NEXT HOUR OR
  SO...ESPECIALLY SOUTHERN/EASTERN CHI TRACON AIRSPACE.

* MEDIUM-HIGH CONFIDENCE IN TIMING CHANGEOVER TO SNOW.

* HIGH CONFIDENCE IN GENERAL WIND TRENDS...MEDIUM CONFIDENCE IN
  DETAILS OF TIMING WIND SHIFT LATE TODAY.

* MEDIUM CONFIDENCE IN SNOW SHOWERS SATURDAY.

RATZER

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

* SUNDAY...CHANCE OF MVFR WITH SNOW SHOWERS.
* MONDAY AND TUESDAY...VFR.
* WEDNESDAY...GUSTY SOUTHERLY WINDS. CHANCE OF RAIN SHOWERS.
* THURSDAY...CHANCE OF MVFR IN RAIN.

MTF

&&

.MARINE...
205 PM CST

MAIN CONCERN IS FOR STORM FORCE GUSTS ACROSS THE SOUTHEAST HALF OF
LAKE MICHIGAN LATE THIS EVENING THROUGH EARLY SATURDAY MORNING. GALE
WARNING HAS BEEN EXPANDED FURTHER NORTH TO COVER THE NORTHERN THIRD
OF LAKE MICHIGAN.

POTENT LOW PRESSURE CONTINUES TO RAPIDLY DEEPEN AND LIFT NORTHEAST
ACROSS THE OHIO VALLEY THIS AFTERNOON...EXPECTED TO SLIDE ACROSS
NORTHEAST LOWER MICHIGAN THIS EVENING. THE PRESSURE GRADIENT WILL
CONTINUE TO TIGHTEN...ALLOWING WINDS TO PUSH TOWARDS GALES. THEN FOR
A PERIOD OF TIME THIS EVENING THROUGH THE OVERNIGHT...GUIDANCE IS
SUGGESTING THAT STORM FORCE WINDS WILL DEVELOP ACROSS THE SOUTHERN
TWO THIRDS OF LAKE MICHIGAN AND FOR THE INDIANA NEARSHORE WATERS OF
LAKE MICHIGAN. GUSTS FOR THOSE AREAS APPEAR TO BE IN THE 48 TO 52
KT...WITH A FEW GUSTS POSSIBLE TO 55 KT. THE PRESSURE RISES ON THE
BACKSIDE OF THIS LOW PRESSURE CONTINUE TO BE RATHER IMPRESSIVE...THROUGH
DAYBREAK SAT. THEN THIS LOW QUICKLY DEPARTS TO THE NORTHEAST
ACROSS ONTARIO...AS WINDS STEADILY DIMINISH SATURDAY EVENING
THROUGH SUNDAY. WEAK SURFACE RIDGE SLIDES ACROSS THE REGION
MONDAY...THEN FLOW TURNS SOUTHWESTERLY. IT APPEARS GALES MAY
RETURN TUESDAY/WEDNESDAY AS THE PRESSURE GRADIENT TIGHTENS YET
AGAIN.

BEACHLER

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...WINTER STORM WARNING...ILZ003-ILZ004-ILZ008 UNTIL 9 PM FRIDAY.

     WINTER STORM WARNING...ILZ005-ILZ006 UNTIL MIDNIGHT SATURDAY.

     WINTER WEATHER ADVISORY...ILZ013-ILZ014 UNTIL MIDNIGHT SATURDAY.

     WINTER WEATHER ADVISORY...ILZ010-ILZ011-ILZ012 UNTIL 9 PM FRIDAY.

     WIND ADVISORY...ILZ023-ILZ033-ILZ039 UNTIL MIDNIGHT SATURDAY.

IN...WIND ADVISORY...INZ001-INZ002-INZ010-INZ011-INZ019 UNTIL
     MIDNIGHT SATURDAY.

LM...GALE WARNING...LMZ080-LMZ567-LMZ669-LMZ671-LMZ673-LMZ675-LMZ744-
     LMZ745-LMZ777-LMZ779-LMZ868-LMZ870-LMZ872-LMZ874-LMZ876-
     LMZ878 UNTIL 8 PM FRIDAY.

     GALE WARNING...LMZ080-LMZ567-LMZ669-LMZ671-LMZ673-LMZ675-LMZ777-
     LMZ779-LMZ868-LMZ870-LMZ872-LMZ874-LMZ876-LMZ878...3 AM
     SATURDAY TO 3 PM SATURDAY.

     STORM WARNING...LMZ080-LMZ567-LMZ669-LMZ671-LMZ673-LMZ675-LMZ744-
     LMZ745-LMZ777-LMZ779-LMZ868-LMZ870-LMZ872-LMZ874-LMZ876-
     LMZ878...8 PM FRIDAY TO 3 AM SATURDAY.

     GALE WARNING...LMZ261-LMZ362-LMZ364-LMZ366-LMZ563-LMZ565 UNTIL 3
     PM SATURDAY.

     GALE WARNING...NEARSHORE WINTHROP HARBOR TO GARY IN UNTIL 9 AM SATURDAY.

     SMALL CRAFT ADVISORY...ILLINOIS NEARSHORE WATERS UNTIL 5 PM FRIDAY.

     SMALL CRAFT ADVISORY...INDIANA NEARSHORE WATERS UNTIL 5 PM FRIDAY.

     GALE WARNING...LMZ744-LMZ745...3 AM SATURDAY TO 9 AM SATURDAY.

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1153 AM CST FRI MAR 2 2012

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
031800-
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-
1153 AM CST FRI MAR 2 2012 /1253 PM EST FRI MAR 2 2012/

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

  WEATHER HAZARDS EXPECTED:

 STRONG TO SEVERE THUNDERSTORMS...THE STRONGEST MAY PRODUCE:

  HAIL TO ONE INCH.
  DAMAGING WIND GUSTS IN EXCESS OF 60 MPH.
  LOCALLY HEAVY RAINFALL.
  FREQUENT CLOUD TO GROUND LIGHTNING.

 HEAVY SNOW...
  FOUR TO SEVEN INCHES...WITH LOCALLY HIGHER AMOUNTS.

  AREAS AFFECTED AND TIMING:

  THUNDERSTORMS ARE EXPECTED TO CONTINUE MOVING THROUGH THE AREA
  SOUTH OF A LINE FROM PONTIAC TO RENSSELAER EARLY THIS
  AFTERNOON...WITH THIS THUNDERSTORM ACTIVITY POSSIBLY SPREADING
  AS FAR NORTH AS THE INTERSTATE 80 CORRIDOR. MOST LIKELY LOCATION
  FOR SEVERE THUNDERSTORMS WILL BE OVER THE FAR SOUTHEASTERN
  PORTIONS OF THE OUTLOOK AREA...SOUTH OF A LINE FROM HEBRON IN
  INDIANA...TO FAIRBURY IN ILLINOIS.

  RAIN WILL TRANSITION OVER TO SNOW THIS AFTERNOON ACROSS
  NORTHWESTERN ILLINOIS...WITH THE TRANSITION LINE FROM RAIN TO
  SNOW SPREADING TO THE SOUTH AND EAST THROUGH THE LATE AFTERNOON
  AND INTO THE EVENING. SEVERAL INCHES...POTENTIALLY GREATER THAN
  SIX INCHES...ARE EXPECTED IN FAR NORTHERN ILLINOIS. THE SNOW
  SHOULD COME TO AN END BY AROUND MIDNIGHT.

  DISCUSSION:

  A RAPIDLY DEEPENING LOW PRESSURE SYSTEM WILL TRACK THROUGH
  CENTRAL ILLINOIS THIS AFTERNOON AND THEN CONTINUE TO THE
  NORTHEAST LATER THIS EVENING. THERE IS A RISK THAT SOME
  THUNDERSTORMS MAY BECOME SEVERE. FARTHER NORTH...A BAND OF
  HEAVY SNOW IS POSSIBLE AS THIS LOW PRESSURE SYSTEM LIFTS
  NORTHEASTWARD...DRAWING COLDER AIR INTO NORTHERN ILLINOIS. SNOW
  MAY BECOME HEAVY AT TIMES...WITH ACCUMULATION RATES OF ONE INCH
  PER HOUR POSSIBLE.

  ADDITIONALLY STRONG WINDS ARE EXPECTED TO DEVELOP ACROSS CENTRAL
  ILLINOIS AND SPREAD NORTHEAST ACROSS PORTIONS OF NORTHEAST
  ILLINOIS AND NORTHWEST INDIANA. WIND GUSTS UP TO 45 MPH ARE
  EXPECTED TO OCCUR LATER THIS AFTERNOON THROUGH THE EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ACROSS THE SOUTHEAST PART OF THE OUTLOOK AREA MAY BE
NEEDED THIS AFTERNOON.

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

LMZ740>745-031800-
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-
1153 AM CST FRI MAR 2 2012

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.

GALE FORCE WINDS TO 40 KT ARE EXPECTED THIS AFTERNOON THROUGH LATE
TONIGHT FOR THE ILLINOIS NEARSHORE WATERS. GALE FORCE WINDS TO 45
KT ARE EXPECTED THIS AFTERNOON THROUGH LATE TONIGHT FOR THE
INDIANA NEARSHORE WATERS.

THERE IS A CHANCE FOR THUNDERSTORMS TODAY FOR THE ILLINOIS AND
INDIANA NEARSHORE WATERS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

WINDS AND WAVES HAZARDOUS TO SMALL CRAFT ARE LIKELY TO CONTINUE
THROUGH SATURDAY EVENING FOR THE ILLINOIS NEARSHORE WATERS AND
THROUGH LATE SATURDAY NIGHT FOR THE NORTHWEST INDIANA NEARSHORE
WATERS.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-031800-
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-
1153 AM CST FRI MAR 2 2012

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

NORTHERLY GALE FORCE WINDS TO 35 KT ARE EXPECTED TO OVERSPREAD
THE SOUTHERN HALF OF LAKE MICHIGAN BY THIS AFTERNOON. THIS
EVENING AND TONIGHT...GALES WILL BECOME WESTERLY AND INCREASE TO
45 KT. A FEW STORM FORCE GUSTS TO 50 KT ARE POSSIBLE.

THERE IS A CHANCE FOR THUNDERSTORMS FOR FAR SOUTHERN PORTIONS OF
LAKE MICHIGAN TODAY.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

GALE FORCE WINDS WILL CONTINUE THROUGH SATURDAY AFTERNOON FOR THE
SOUTHERN HALF OF LAKE MICHIGAN.

GALE FORCE WINDS ARE POSSIBLE AGAIN ON TUESDAY.

&&

COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO
WEBPAGE: WEATHER.GOV/CHICAGO

RODRIGUEZ

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
242 PM CST FRI MAR 02 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0215 PM     HAIL             PARK RIDGE              42.01N 87.84W
03/02/2012  E0.25 INCH       COOK               IL   COCORAHS

            HAIL MELTED ALMOST IMMEDIATELY ON DRIVEWAY BUT REMAINS ON
            GRASS.

&&

CM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
243 PM CST FRI MAR 02 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0228 PM     HAIL             WILMETTE                42.08N 87.73W
03/02/2012  E0.25 INCH       COOK               IL   TRAINED SPOTTER

&&

CM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
251 PM CST FRI MAR 02 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0250 PM     HAIL             OAK BROOK               41.84N 87.95W
03/02/2012  M0.25 INCH       DUPAGE             IL   CO-OP OBSERVER

            PEA SIZED HAIL REPORTED

&&

JEE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
306 PM CST FRI MAR 02 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0237 PM     HAIL             MOUNT PROSPECT          42.07N 87.94W
03/02/2012  M0.25 INCH       COOK               IL   TRAINED SPOTTER

            PEA SIZED GRAUPEL MIXED WITH RAIN

0237 PM     HAIL             WARRENVILLE             41.82N 88.19W
03/02/2012  M0.25 INCH       DUPAGE             IL   TRAINED SPOTTER

            PEA SIZED GRAUPEL MIXED WITH RAIN.

0235 PM     HAIL             2 SW LISLE              41.77N 88.12W
03/02/2012  M0.25 INCH       DUPAGE             IL   TRAINED SPOTTER

            GRAUPEL MIXED WITH RAIN.

0215 PM     HAIL             WNW PARK RIDGE          42.01N 87.84W
03/02/2012  M0.25 INCH       COOK               IL   COCORAHS

            PEA SIZED GRAUPEL MIXED WITH RAIN.

0230 PM     HAIL             ESE WINNETKA            42.11N 87.74W
03/02/2012  M0.25 INCH       COOK               IL   COCORAHS

            PEA SIZED GRAUPEL MIXED WITH RAIN AND THUNDER.

0250 PM     HAIL             2 WNW BULL VALLEY       42.32N 88.39W
03/02/2012  M0.25 INCH       MCHENRY            IL   COCORAHS

            PEA SIZED GRAUPEL MIXED WITH RAIN FEEL AT 215 PM CST THEN
            TRANSITION TO SNOW BY 250 PM CST.

0305 PM     HAIL             LISLE                   41.79N 88.09W
03/02/2012  M0.25 INCH       DUPAGE             IL   TRAINED SPOTTER

            PEA SIZED GRAUPEL MIXED WITH RAIN.

&&

JEE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
308 PM CST FRI MAR 02 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0250 PM     HEAVY SNOW       MENDOTA                 41.55N 89.12W
03/02/2012  U0.0 INCH        LA SALLE           IL   PUBLIC

            HEAVY THUNDERSNOW.

&&

RC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
309 PM CST FRI MAR 02 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0308 PM     SNOW             ROSCOE                  42.42N 89.01W
03/02/2012  M1.0 INCH        WINNEBAGO          IL   PUBLIC

            SNOW TOTAL SO FAR. RELAYED BY WREX.

&&

RC