Hail in Illinois, May 7, 2010

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
308 AM CDT FRI MAY 7 2010

.DISCUSSION...
805 PM CDT

GOING FORECAST APPEARS TO BE IN GOOD SHAPE OVERALL. DID SEND A MINOR
UPDATE TO ACCOUNT FOR NEAR TERM TEMPS TRENDS AS RELATIVELY FRIGID
MIGHTY MICHIGAN HAS ONCE AGAIN FLEXED HER MIGHT AND SENT A LAKE
BREEZE SOARING WEST. CAN ACTUALLY SEE THE LAKE BREEZE IN CARROLL
COUNTY IL BEGINNING TO APPROACH THE MISSISSIPPI RIVER ON KDVN
WSR-88D...PRETTY IMPRESSIVE WORK FOR A LAKE LESS THAN 100 MILES
ACROSS!

OBVIOUSLY MOST OF THE ATTENTION TONIGHT IS FOCUSED ON CONVECTIVE
POTENTIAL OVERNIGHT INTO FRIDAY MORNING. WATER VAPOR IMAGERY SHOWS A
DEEPENING TROUGH OVER THE WESTERN CONUS WITH STRENGTHENING LOW LEVEL
SOUTHERLY FLOW OVER THE CENTRAL AND SOUTHERN PLAINS IN RESPONSE TO
SIZABLE HEIGHT FALLS IN ADVANCE OF THIS TROUGH. THE STRENGTHENING
SOUTHERN FLOW IS RESULTING IN A HEALTHY NORTHWARD SURGE OF HIGHER
THETA-E AIR MASS...WHICH HAS RECENTLY RESULTED IN A RAPID EXPANSION
OF STRATUS/ALTO-STRATUS OVER NORTHEAST KS/NORTHWEST MO AS THIS
RICHER THETA-E AIRMASS IS ISENTROPICALLY LIFTED OVER TOP THE WARM
FRONT STRETCHING FROM SOUTHERN KS INTO CENTRAL MO.

THERE WILL NOT ONLY BE A CONTINUATION OF THE LOW LEVEL THETA-E
ADVECTION TONIGHT...BUT WOULD EXPECT THIS PROCESS TO RAMP UP WITH
THE DEVELOPMENT OF SOUTHERLY NOCTURNAL LOW LEVEL JET OVER THE NEXT
HOUR OR TWO. MODELS ARE IN SURPRISINGLY GOOD AGREEMENT THAT ELEVATED
CONVECTION WILL BREAK OUT BETWEEN 02-04Z OVER NE KS/NW MO WITH SOME
INDICATIONS OF THIS ALREADY EVIDENT WITH THE RECENT BLOSSOMING OF
SOME ACCAS WITHIN THE STRATUS DECK. THIS CONVECTION SHOULD
DEVELOP/EXPAND EAST-NORTHEASTWARD OVERNIGHT MOVING INTO WESTERN IL
TOWARD MIDNIGHT BEFORE SPREADING INTO THE CHGO METRO AREA PRIOR TO
SUNRISE.

KILX/KTOP EVENING RAOBS BOTH SAMPLED SOME STEEP MID LEVEL LAPSE
RATES...WHICH SHOULD MAKE THE LOW LEVEL THETA-E ADVECTION ALL THAT
MUCH MORE EFFECTIVE AT DESTABILIZING THE ATMOSPHERE. GIVEN THE STEEP
LAPSE RATES AND FAIRLY LOW WET BULB ZERO HEIGHTS IT WOULDNT BE
SURPRISING TO SEE SOME OF THE MORE ROBUST UPDRAFTS PRODUCE SOME HAIL
OVERNIGHT...THOUGH AS LOW LEVEL JET WEAKENS/VEERS AND CONVECTION
BECOMES MORE WIDESPREAD THAT THREAT SHOULD TEND TO DIMINISH AS OR
SHORTLY AFTER THE CONVECTION IS MOVES INTO OUR CWA.

NO FURTHER EVENING UPDATES TO FORECAST PLANNED AT THIS
TIME...PENDING ANY COMPELLING OBSERVATIONAL DATA THAT WOULD ARGUE
FOR SOMETHING OTHERWISE!

IZZI

PREV DISCUSSION...
312 PM CDT

FORECAST CONCERNS ARE WITH AN APPROACHING SYSTEM FROM THE CENTRAL
PLAINS WHICH WILL BRING SHOWER AND THUNDERSTORM CHANCES TONIGHT
AND FRIDAY.

A VERY BEAUTIFUL DAY IN THE CHICAGOLAND AREA TODAY WITH AN
ABUNDANT AMOUNT OF SUNSHINE WHICH HELPED TEMPS RISE TO THE MID AND
UPPER 60S. THIS COUPLED WITH LIGHT WINDS IS PROVIDING VERY
PLEASANT CONDITIONS. THIS IS ONGOING AS LONG WAVE TROUGH/CLOSED
CIRCULATION CONTINUES TO PROGRESS OFF TO THE EAST TODAY WITH UPPER
LEVEL RIDGING OCCURRING ACROSS THE MIDWEST. WITHIN THIS RIDGE...A
WEAK MID LEVEL WAVE HAS BEEN PROGRESSING THROUGH PORTIONS OF
WISCONSIN AND ILLINOIS WHICH IS PROVIDING SOME MID TO HIGH LEVEL
CLOUD COVER. EXPECT HIGH LEVEL CLOUD COVER TO MOVE IN FROM THE
WEST...AS A FAIR AMOUNT OF MOISTURE CAN BE SEEN MOVING ACROSS THE
CENTRAL PLAINS ON WATER VAPOR IMAGERY. THIS MOISTURE WILL CONTINUE
TO INCREASE CLOUD COVER OVER THE CWA THIS EVENING.

ATTENTION THEN SHIFTS TOWARDS DEVELOPING SYSTEM IN THE CENTRAL
PART OF THE CONUS. LATEST WATER VAPOR IMAGERY SHOWING LONGWAVE
TROUGH OUT IN THE WEST. OUR RISING HEIGHTS TODAY WILL BE REPLACED
WITH HEIGHT FALLS AS AN 100+ KT JET ROUNDS THE BASE OF THIS
TROUGH...AND EMBEDDED SHORT WAVE TROUGHS TRAVERSE THIS FLOW. LEE
CYCLOGENESIS WILL OCCUR IN THE WAKE OF THIS UPPER LEVEL FEATURE
WITH A SURFACE LOW DEVELOPING OVER THE CENTRAL PLAINS TONIGHT.
WITH OVERALL UPPER LEVEL SYSTEM MOVING EAST TONIGHT...A GOOD
AMOUNT OF WAA HELPED BY 35+ KT LLJ WILL OCCUR OVER MUCH OF THE
CENTRAL PLAINS AND MIDWEST PUSHING AN UPPER LEVEL FRONT OVER THE
AREA LATE TONIGHT. THIS MOISTURE AND TEMPERATURE ADVECTION OVER
THIS FRONT WILL HELP SPREAD PRECIP INTO THE CWA TONIGHT...MAINLY
AFTER MIDNIGHT. CHANCES INCREASE SIGNIFICANTLY FOR PRECIP OVER
NIGHT THROUGH THE EARLY MORNING HOURS ON FRIDAY AS SURFACE LOW
CONTINUES TO APPROACH. EVEN WITH BETTER THETAE ADVECTION TO THE
SOUTH...PRECIPITABLE WATER VALUES WILL INCREASE. THIS WILL HELP
BRING RAINFALL TOTALS OF AN INCH TO AN INCH AND HALF ACROSS THE
CWA...WITH THE NORTHWEST TWO THIRDS OBSERVING THE MORE SIGNIFICANT
RAINFALL. INSTABILITY WILL BE TRYING TO INCREASE DURING THE NIGHT
TONIGHT BUT IT STILL LOOKS AS IF THE BETTER INSTABILITY WILL
REMAIN TO THE SOUTH OF THE CWA. SO AM STILL NOT CONVINCED OF AN
OVERALL THUNDERSTORM THREAT...JUST MAINLY RAIN WITH THE EXCEPTION
OF AREAS SOUTH OF INTERSTATE 80. ALTHOUGH...THERE MAY BE A BRIEF
TIME WHERE AREAS IN NORTHERN HALF OF THE CWA OBSERVE A BRIEF
RUMBLE OF THUNDER AS NOSE OF LLJ WILL BE OVERHEAD.

LOW THEN CONTINUES TO THE NORTHEAST ON FRIDAY WITH IT OVER THE CWA
BY MID DAY. AS THIS OCCURS...RAIN CHANCES WILL DECREASE FROM WEST
TO EAST THROUGH THE EARLY AFTERNOON. ALTHOUGH...QUESTIONS ARISE
FOR THE POTENTIAL FOR RENEWED THUNDERSTORM DEVELOPMENT ACROSS THE
SOUTHEAST PORTION OF THE CWA...MAINLY AREAS FROM FORD AND IROQUOIS
COUNTIES IN ILLNOIS TO THE NEWTON...JASPER...AND BENTON COUNTIES
IN INDIANA. THE QUESTION AT HAND WILL BE HOW MUCH THAT AREA CAN
DESTABLIZE...WHICH WILL BE DUE IN PART TO LINGERING CLOUD COVER.
WITH STRONG SOUTHERLY FLOW STILL OCCURRING DURING THE AFTERNOON
WITH THE PASSAGE OF A WARM FRONT...MOISTURE ADVECTION WILL STILL
BE ONGOING. SREF GUIDANCE IS INDICATING THAT WITH MID LEVEL LAPSE
RATES INCREASING IN THIS GENERAL AREA ON FRIDAY...SURFACE BASE
CAPE IN UPWARDS OF A 1000 J/KG OR MORE WILL BE POSSIBLE. THIS
COUPLED WITH LARGE SCALE FORCING DUE TO MID LEVEL FLOW OF AROUND
60 KT ROUNDING UPPER LEVEL TROUGH AND SURFACE COLD FRONT MOVING
THROUGH THE CWA...CHANCES FOR THUNDERSTORMS WILL INCREASE. ALTHOUGH
THIS WOULD MAINLY BE FOR THE AFTERNOON THROUGH EARLY EVENING TIME
FRAME...AS ATMOSPHERE QUICKLY STABILIZES WITH PASSAGE OF COLD
FRONT. IT DOES STILL APPEAR AS THE BETTER CHANCES FOR SEVERE
WEATHER WILL BE JUST TO THE SOUTHEAST OF THE CWA...BUT THIS WILL
HAVE TO CONTINUE TO BE MONITORED AS THE POTENTIAL FOR THE
SOUTHEAST PART OF THE CWA TO OBSERVE SEVERE IS THERE.

RODRIGUEZ

&&

.AVIATION...

ORD/MDW CONCERNS...UPDATED 08Z...MULTIPLE FORECAST CONCERNS THIS
PERIOD. THUNDERSTORMS WILL CONTINUE THRU MID MORNING WITH ANOTHER
BRIEF CHANCE OF THUNDER AGAIN THIS AFTERNOON. WIND DIRECTIONS FROM
LATE MORNING THRU MID AFTERNOON THEN WIND SPEEDS THIS EVENING AND
OVERNIGHT. IFR CIGS ALSO EXPECTED WITH THE POTENTIAL FOR LIFR
CIGS.

08Z TAFS...COVERAGE OF SHOWERS AND THUNDERSTORMS CONTINUES TO
INCREASE...BUT IS A BIT FURTHER SOUTH THAN PREVIOUSLY EXPECTED.
STILL MAY NEED TO GO PREVAILING THUNDER FOR A FEW HRS...ESPECIALLY
AT ORD AND MDW BUT OPTED TO STAY WITH TEMPO FOR THIS AMENDMENT.
CIGS REMAIN VFR THOUGH A FEW LOCATIONS REPORTING SOME CLOUDS IN
THE 3-4KFT RANGE. HEAVIEST RAINS COULD EASILY LOWER VISIBILITIES
INTO IFR.

...PREVIOUS 06Z DISCUSSION...

06Z TAFS...SHOWERS INCREASING IN COVERAGE AND INTENSITY ACROSS THE
AREA WITH MOST OF THE ACTIVITY HAVING AT LEAST A FEW LIGHTNING
STRIKES. MODELS IN GOOD AGREEMENT WITH THIS ACTIVITY CONTINUING TO
INCREASE OVER THE NEXT FEW HRS AS A SHORT WAVE OVER IOWA/MISSOURI
SHIFTS EAST ACROSS THE AREA. EXPECT MORE OF A PREVAILING THREAT
FOR THUNDER IN A FEW HRS AND HAVE INCLUDED TEMPO THUNDER. IF
COVERAGE BECOMES WIDESPREAD ENOUGH...MAY NEED TO TIME PREVAILING
THUNDER FOR A FEW HRS. LINGERING SHOWERS/LIGHT RAIN WILL CONTINUE
THRU MID MORNING WITH A BREAK EXPECTED MID DAY.

AS AN AREA OF LOW PRESSURE MOVES NORTHEAST ACROSS NORTHWEST
INDIANA THIS AFTERNOON INTO THIS EVENING ADDITIONAL THUNDERSTORMS
ARE EXPECTED TO DEVELOP ALONG A COLD FRONT...MAINLY SOUTH OF THE
LOW. THUS THE GREATEST CHANCE FOR THUNDER WILL BE AT GYY/MDW.
HOWEVER...IF THE LOW TRACKS A LITTLE FURTHER NORTH...THREAT OF
THUNDER MAY ALSO DRIFT INTO ORD AND DPA. ANY STORMS THAT DO FORM
THIS AFTERNOON SHOULD QUICKLY SHIFT EAST...ENDING THE THREAT OF
THUNDER.

WITH THE LOW TRACKING SO CLOSE OR EVEN OVER THE TERMINALS LATER
TODAY...WIND DIRECTIONS WILL BE DIFFICULT TO PREDICT. EXPECT AN
EASTERLY WIND TO INCREASE SOME OVERNIGHT...WITH GUSTS TO 20KTS
POSSIBLE. WITH THE EXPECTED TRACK OF THE LOW...EXPECT WINDS TO
TURN SOUTHEAST BY LATE MORNING THEN SWING AROUND NORTHERLY FOR A
FEW HRS BY MID/LATE AFTERNOON...FINALLY TURNING BACK WEST/
NORTHWEST THIS EVENING. WIND DIRECTIONS WILL NEED TO REFINED WITH
LATER FORECASTS.

CONVECTION OVERNIGHT WILL BE ELEVATED WITH CURRENT CIGS 6 TO 7KFT
OR HIGHER. EVENTUALLY...AS PRECIP SATURATES THE LOW LEVELS...
EXPECT LOWER CIGS TO FORM AND WITH EASTERLY FLOW OFF THE LAKE...
CIGS SHOULD LOWER INTO IFR. HOWEVER...IF WINDS TURN MORE SOUTHEAST
THEN SOUTH BEFORE SWITCHING NORTH WITH THE PASSAGE OF THE LOW...
LOWER CIGS MAY SCATTER OUT...BEFORE LOWERING BACK INTO LOW MVFR OR
EVEN IFR AGAIN FOR A FEW HRS ON THE BACK SIDE OF THE LOW...WITH
MVFR CIGS EXPECTED THRU MUCH OF THE NIGHT.

ORD/MDW CONFIDENCE...UPDATED 08Z...HIGH CONFIDENCE THUNDER WILL
AFFECT THE TERMINALS THRU MID MORNING. MEDIUM CONFIDENCE ON END
TIME. MEDIUM CONFIDENCE HEAVIEST STORMS COULD PRODUCE BRIEF IFR
VISIBILITY. LOW CONFIDENCE ON THUNDER THREAT THIS AFTERNOON. HIGH
CONFIDENCE ON VFR CIGS THRU 12Z. MEDIUM CONFIDENCE ON IFR CIGS
THIS MORNING. LOW CONFIDENCE ON IFR CIGS THIS AFTERNOON. HIGH
CONFIDENCE ON MVFR CIGS THIS EVENING AND OVERNIGHT. MEDIUM
CONFIDENCE ON EASTERLY WINDS GUSTING UP TO 20 KTS FROM NOW THRU
MID MORNING. LOW CONFIDENCE ON WIND DIRECTIONS AND SPEEDS FROM
MID MORNING THROUGH LATE AFTERNOON. HIGH CONFIDENCE WINDS WILL
BECOME WEST/NORTHWEST BY EARLY EVENING.

ORD/MDW OUTLOOK FOR 12Z SATURDAY THROUGH 12Z WEDNESDAY...

...UPDATED 18Z THURSDAY...

SATURDAY...MVFR BECOMING VFR.
SUNDAY...VFR.
MONDAY...VFR.
TUESDAY...SHOWERS/THUNDERSTORMS WITH POSSIBLE MVFR.

CMS

&&

.MARINE...
248 PM CDT

MAIN CONCERN FOR MARINE FORECAST IS BRIEF PERIOD OF GUSTY
EAST/NORTHEAST WINDS FRIDAY...THEN POTENTIAL FOR NORTHERLY GALES
LATE FRIDAY NIGHT INTO SATURDAY.

SFC RIDGE AXIS EXTENDS FROM LAKE SUPERIOR SOUTH ACROSS LAKE
MICHIGAN THIS AFTERNOON. THIS RIDGE WILL MOVE EAST TONIGHT...
AS LOW PRESSURE CONTINUES TO DEVELOP ACROSS SOUTHEAST COLORADO.
THIS LOW WILL MOVE QUICKLY TO WESTERN IL BY FRIDAY MORNING...
THEN WILL TRACK ALONG THE SOUTH SHORE OF LAKE MICHIGAN EARLY
FRIDAY AFTERNOON BEFORE MOVING OFF TO THE EAST AND DEEPENING OVER
NEW ENGLAND FRIDAY NIGHT. COLD AIR THEN PLUNGES SOUTH ACROSS LAKE
MICHIGAN LATE FRIDAY NIGHT/SATURDAY WITHIN TIGHT SFC PRESSURE
GRADIENT BETWEEN LOW OFF TO THE EAST AND HIGH PRESSURE BUILDING
ACROSS THE PLAINS. FORECAST SOUNDINGS FROM BOTH WRF-NAM AND GFS
MODELS SUGGEST A PERIOD OF GALE FORCE NORTHERLY WINDS LIKELY FROM
BEFORE SUNRISE TO PERHAPS LATE MORNING/EARLY AFTN. WILL HOIST GALE
WATCH FOR THIS PERIOD AT THIS TIME. WINDS THEN DIMINISH FAIRLY
QUICKLY LATE SATURDAY AS SFC HIGH CONTINUES TO SPREAD EAST ACROSS
THE MIDWEST BY SUNDAY.

RATZER

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...SMALL CRAFT ADVISORY...LMZ740-LMZ741...10 AM FRIDAY TO 7 PM
     FRIDAY.

     GALE WATCH...LMZ080-LMZ261-LMZ362-LMZ364-LMZ366-LMZ563-LMZ565-
     LMZ567-LMZ669-LMZ671-LMZ673-LMZ675-LMZ777-LMZ779-LMZ868-
     LMZ870-LMZ872-LMZ874-LMZ876-LMZ878...4 AM SATURDAY TO 3 PM
     SATURDAY.

&&

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
505 PM CDT THU MAY 6 2010

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
072215-
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-
505 PM CDT THU MAY 6 2010 /605 PM EDT THU MAY 6 2010/

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

.DAY ONE...TONIGHT.

  WEATHER HAZARDS EXPECTED:

  SCATTERED THUNDERSTORMS...THE STRONGEST MAY PRODUCE:
   HEAVY RAIN.
   HAIL TO THE SIZE OF DIMES.
   WIND GUSTS OVER 40 MPH.
   CLOUD TO GROUND LIGHTNING.

  AREAS AFFECTED AND TIMING:

  SCATTERED THUNDERSTORMS WILL OVERSPREAD THE OUTLOOK AREA FROM
  THE SOUTHWEST AFTER MIDNIGHT.

  DISCUSSION:

  THUNDERSTORMS WILL DEVELOP OVER IOWA AND NORTHERN MISSOURI THIS
  EVENING...SPREADING EASTWARD INTO NORTHERN AND CENTRAL ILLINOIS
  LATE TONIGHT IN ADVANCE OF AN APPROACHING WARM FRONT.
  INSTABILITY IS FORECAST TO REMAIN RATHER LOW...SO THE PRIMARY
  THREAT FROM ANY THUNDERSTORMS WILL BE HEAVY RAINFALL AND CLOUD
  TO GROUND LIGHTNING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

  THUNDERSTORMS WILL LINGER INTO THE MORNING HOURS FRIDAY...WITH
  THE POTENTIAL FOR LOCALLY HEAVY RAINFALL TOTALS.

  ADDITIONAL THUNDERSTORMS MAY DEVELOP FRIDAY AFTERNOON...MAINLY
  EAST OF INTERSTATE 55. SHOULD SUFFICIENT INSTABILITY DEVELOP
  THEN THESE STORMS WOULD HAVE THE POTENTIAL TO BECOME SEVERE
  GIVEN THE EXPECTED STRONG WIND FIELDS ALOFT.

  THERE IS A CHANCE OF FROST IN OUTLYING AREA SATURDAY NIGHT INTO
  EARLY SUNDAY MORNING.

  ADDITIONAL THUNDERSTORMS ARE POSSIBLE BEGINNING LATE MONDAY
  NIGHT AND CONTINUING INTO TUESDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

  SPOTTERS ARE ENCOURAGED TO RELAY ANY REPORTS OF HEAVY RAINFALL
  FRIDAY MORNING.

  SPOTTERS SHOULD ALSO MONITOR WEATHER DEVELOPMENTS FRIDAY
  AFTERNOON FOR THE POTENTIAL FOR ACTIVATION...ESPECIALLY EAST OF
  INTERSTATE 55.

&&

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

LMZ740>745-072215-
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-
505 PM CDT THU MAY 6 2010

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

.DAY ONE...TONIGHT.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THUNDERSTORMS ARE POSSIBLE FRIDAY MORNING.

STRONG WINDS AND HIGH WAVES WILL LEAD TO HAZARDOUS CONDITIONS FOR
SMALL CRAFT ALONG THE ILLINOIS SHORE FRIDAY INTO FRIDAY
EVENING...THEN AGAIN SATURDAY.

THUNDERSTORMS ARE POSSIBLE BEGINNING LATE MONDAY NIGHT AND
CONTINUING INTO TUESDAY NIGHT.

&&

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-
870-872-874-876-878-072215-
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 TOW 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-
505 PM CDT THU MAY 6 2010

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

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THERE IS A CHANCE OF THUNDERSTORMS OVER SOUTHERN PORTIONS OF THE
LAKE FRIDAY.

GALE FORCE WINDS ARE POSSIBLE LATE FRIDAY NIGHT INTO SATURDAY.

THUNDERSTORMS ARE POSSIBLE AGAIN BEGINNING LATE MONDAY NIGHT AND
CONTINUING INTO TUESDAY NIGHT.

&&

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

IZZI

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
347 AM CDT FRI MAY 07 2010

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

0341 AM     HAIL             STREATOR                41.13N 88.83W
05/07/2010  M1.00 INCH       LA SALLE           IL   TRAINED SPOTTER

0341 AM     TSTM WND GST     STREATOR                41.13N 88.83W
05/07/2010  E45.00 MPH       LA SALLE           IL   TRAINED SPOTTER

            ESTIMATED WIND GUSTS TO 45 MPH.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
418 AM CDT FRI MAY 07 2010

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

0417 AM     HAIL             WILMINGTON              41.30N 88.16W
05/07/2010  E0.25 INCH       WILL               IL   TRAINED SPOTTER

&&