Flash Flood Warning 7, NWS Chicago, IL

181 
WGUS73 KLOT 110135
FFSLOT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
835 PM CDT WED JUN 10 2015

ILC093-197-110345-
/O.CON.KLOT.FF.W.0007.000000T0000Z-150611T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WILL IL-KENDALL IL-
835 PM CDT WED JUN 10 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT FOR
NORTHWESTERN WILL AND SOUTHEASTERN KENDALL COUNTIES...

AT 830 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS CONTINUE TO 
PRODUCE HEAVY RAIN ACROSS THE WARNED AREA. RADAR RAINFALL ESTIMATES 
INDICATE THAT BETWEEN ONE TO THREE INCHES OF RAIN HAS OCCURRED 
WITHIN THE PAST FEW HOURS. ADDITIONAL BRIEF HEAVY DOWNPOURS MAY 
CONTINUE FOR AREAS ALONG AND SOUTH OF A ROCKDALE TO FRANKFORT LINE. 

SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE... 
JOLIET...ORLAND PARK...TINLEY PARK...ROMEOVILLE...PLAINFIELD... 
LOCKPORT...NEW LENOX...MOKENA...FRANKFORT...CHANNAHON...MINOOKA... 
INGALLS PARK...SHOREWOOD...MANHATTAN...ELWOOD...ROCKDALE...GOODINGS 
GROVE...CREST HILL...FAIRMONT AND CRYSTAL LAWNS.

INCLUDING THE FOLLOWING INTERSTATES...
 I-55 BETWEEN MILE MARKERS 247 AND 262.
 I-80 BETWEEN MILE MARKERS 120 AND 148.
 I-355 BETWEEN MILE MARKERS 1 AND 6.

THIS INCLUDES...  
UNIVERSITY OF ST. FRANCIS...CHICAGOLAND SPEEDWAY ROUTE 66 RACEWAY...
JOLIET JUNIOR COLLEGE...JOLIET SLAMMERS BASEBALL...AND LEWIS
UNIVERSITY.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4141 8785 4144 8825 4146 8825 4146 8844
      4156 8844 4165 8813 4161 8791 4156 8791
      4156 8779

$$

BEACHLER

952 
WGUS73 KLOT 110341
FFSLOT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1041 PM CDT WED JUN 10 2015

ILC093-197-110350-
/O.EXP.KLOT.FF.W.0007.000000T0000Z-150611T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WILL IL-KENDALL IL-
1041 PM CDT WED JUN 10 2015

...THE FLASH FLOOD WARNING FOR NORTHWESTERN WILL AND SOUTHEASTERN
KENDALL COUNTIES WILL EXPIRE AT 1045 PM CDT...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT.

IF YOU RECEIVED FLASH FLOODING...PLEASE REPORT TO YOUR LAW 
ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER SERVICE.

LAT...LON 4141 8785 4144 8825 4146 8825 4146 8844
      4156 8844 4165 8813 4161 8791 4156 8791
      4156 8779

$$

MTF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
520 PM CDT WED JUN 10 2015

.SHORT TERM...
245 PM CDT

THROUGH THURSDAY...

A RATHER TOASTY AND UNCOMFORTABLE AFTERNOON FOR MANY LOCATIONS WITH
READINGS IN THE UPPER 80S TO LOW 90S AND DEWPOINTS IN THE MID 60S TO
LOW 70S. THE EXCEPTION IS IN FAR NORTH CENTRAL ILLINOIS NEAR A COLD
FRONT... AND LAKEFRONT LOCATIONS IN LAKE COUNTY ILLINOIS WHERE A
LAKE BREEZE BROUGHT SOME COOLING. HEAT INDEX READINGS ARE INTO THE
MID AND UPPER 90S...LOCALLY NEAR 100 GIVEN THESE MOIST DEWPOINTS IN
PLACE.

RECENT AMDAR SOUNDINGS OUT OF MDW AND SPC MESOANALYSIS SUGGEST
CONTINUED INSTABILITY DEVELOPING DUE TO STRONG HEATING AND LOW LEVEL
MOISTENING...ROUGHLY 3000 J/KG...BUT STILL SOME LEVEL OF CAPPING IN
PLACE. THERE IS A SUBTLE SHORTWAVE PROGRESSING INTO FAR NORTHERN
ILLINOIS WHERE THERE IS SOME ALTOCUMULUS NOTED ON VISIBLE SATELLITE
ALONG WITH A SLOWLY SOUTHEASTWARD MOVING COLD FRONT THAT IS
SOMEHWERE ALONG A THE ROCHELLE (KRPJ) TO OHARE (KORD ) LINE.
ADDITIONALLY...A LAKE BREEZE HAS FORMED ACROSS FAR NORTHEAST
ILLINOIS EARLY THIS AFTERNOON...AND IT IS EXPECTED TO CONTINUE
INLAND THROUGH THE AFTERNOON AND EVENING.

THESE ARE THE MECHANISMS THAT WILL BE NEEDED IN CONJUNCTION WITH THE
CONTINUED BOUNDARY LAYER WARMING FOR THUNDERSTORM DEVELOPMENT LATER
THIS AFTERNOON AND EVENING. A PLETHORA OF GUIDANCE STILL CONTINUES
TO SUGGEST THAT AREAS MAINLY ALONG AND SOUTH OF I-80 STAND THE BEST
CHANCE OF THESE FACTORS COMING TOGETHER. STORM BASES WILL BE RATHER
HIGH...AND WITH STRONG LOWER LEVEL LAPSE RATES GUSTY WINDS WILL BE
THE MOST SIGNIFICANT HAZARD WITH ANY STRONGER THUNDERSTORMS.
PRECIPITABLE WATER VALUES ARE NOT AS HIGH AS THOUGHT...BUT ARE STILL
IN THE 75TH PERCENTILE...SO LOCALLY HEAVY RAINFALL IS STILL A
CONCERN. THERE MAY BE SOME TRAINING GIVEN THE SLOWER MOVING COLD
FRONT...SLOWER MOVING SOMEWHAT BOUNDARY PARALLEL STORM MOTION
VECTIONS...BUT THE WINDOW FOR FORCING COINCIDING WITH THE BOUNDARY
LAYER DESTABILITIZATION DOES NOT APPEAR TO BE SUPER LONG. WE WILL
CONTINUE THE ESF TO MENTION LOCALLY HEAVY RAINFALL THIS EVENING IN
ALREADY SATURATED AREAS.

THE LOW LEVEL FRONTAL BOUNDARY HANGS UP OVER THE SOUTHERN CWA
TONIGHT WHERE WE WILL HANG ONTO SOME LOWER CHANCES FOR
SHOWERS/STORMS...BUT A GENERAL DOWNWARD TREND IS EXPECTED.

FOR AREAS AWAY FROM LAKE MICHIGAN...THE AIRMASS WILL ONLY COOL A
LITTLE ON THURSDAY...ESPECIALLY SOUTH AND WESTERN LOCATIONS WHERE
UPPER 80S TO LOW 90S ARE AGAIN EXPECTED. WITH MORE 80S
ELSEWHERE...AND MUCH COOLER LAKESIDE CONDITIONS DUE TO ONSHORE FLOW.
LOW LEVEL SW FLOW STRENGTHENS ON THURSDAY AHEAD OF A STRONGER UPPER
LEVEL DISTURBANCE MOVING THROUGH THE CENTRAL PLAINS WHICH WILL DRIVE
A FAIRLY STRONG SURFACE LOW PRESSURE SYSTEM INTO WESTERN IOWA LATE
THURSDAY AND ACROSS IOWA THURSDAY NIGHT. AHEAD OF THIS SYSTEM THE
LOW LEVEL BOUNDARY WILL LIFT NORTHWARD DURING THE DAY...BUT THE
BOUNDARY IS EXPECTED TO STRENGTHEN AS THE WARM MOIST SOUTHERLY FLOW
ENCOUNTERS COOLER ONSHORE FLOW. THERE LOOKS TO BE SOME MORNING
ELEVATED ACTIVITY OVER THE STALLED OUT WARM FRONT WITH BEST CHANCES
IN NORTHERN ILLINOIS. ADDITIONAL AND MORE SIGNIFICANT CONCERNS ARISE
AS THE AFTERNOON PROGRESSES. WE SHOULD DESTABILIZE AGAIN ALONG AND
SOUTH OF THE BOUNDARY AGAIN THURSDAY. STRONG BOUNDARY LAYER/LOWER
LEVEL FLOW COUPLED WITH LEAD DISTURBANCES AHEAD OF THE PLAINS LOW
WILL ALLOW FOR ORGANIZED STORMS CAPABLE OF SEVERE WINDS AND LARGE
HAIL ALONG WITH A NON-ZERO TORNADO THREAT IN NORTH CENTRAL ILLINOIS
LATE AFTERNOON. ALTHOUGH THE BETTER FORCING IS OFF TO OUR
WEST...ENOUGH SIGNALS ARE PRESENT SUCH THAT SPC HAS UPDATED THE DAY
2 CONVECTIVE OUTLOOK TO INCLUDE MUCH OF THE AREA IN A SLIGHT RISK
FOR SEVERE STORMS.

KMD

&&

.LONG TERM...
236 PM CDT

THURSDAY NIGHT THROUGH WEDNESDAY...

A VERY ACTIVE PATTERN IS SETTING UP FOR THE EXTENDED FORECAST
PERIOD.  THE SUBTROPICAL UPPER RIDGE WILL EXTEND ACROSS THE SERN
CONUS THROUGH THE WRN GLFMEX WITH A FAST...PROGRESSIVE NORTHERN
STREAM WITH A SERIES UP STRONG UPPER LOWS MOVING ACROSS SRN CANADA
WHILE A SERIES OF PACIFIC MIDDLE STREAM AND SOUTHERN STREAM
SHORTWAVES CROSS THE UPPER MIDWEST AND GREAT LAKES REGIONS.  THIS
WILL LEAD TO A RELATIVELY HIGH CONFIDENCE FORECAST OF PERIODIC AND
ALMOST DAILY TSRA/SHRA CHANCES FOR THE PERIOD.  HOWEVER...IN A FAST
FLOW PATTERN...CONFIDENCE IS LOWER ON THE EXACT TIMING OF THE
SHORTWAVES EXPECTED TO IMPACT THE THUNDERSTORM FORECAST DETAILS FOR
THE LOCAL AREA.  SO...THE SCREAMING MESSAGE OF THE LONGER TERM MODEL
GUIDANCE...WHICH IS RELATIVELY CONSISTENT IN TRENDS...BUT
NECESSARILY IN TIMING OF INDIVIDUAL SHORTWAVES...IS THAT THE
EXTENDED FORECAST PERIOD WILL...GENERALLY...BE WET.

THE GENERAL TEMPERATURE TREND THROUGH THE EXTENDED PERIOD WILL BE
FOR ABOVE NORMAL TEMPERATURES WITH FEWER OPPORTUNITIES FOR LAKE
BREEZE DEVELOPMENT.  SO...EVEN LOCATIONS ALONG THE LAKE WILL SEE THE
MORE SUMMER-LIKE CONDITIONS.  THE ONE DAY THAT WILL LIKELY BE AN
EXCEPTION TO THE RELATIVELY WARM WEATHER WILL BE SATURDAY.  THE
STRONG SYSTEM THAT IS EXPECTED TO BRING A PERIOD OF HEAVY RAIN TO
THE UPPER MIDWEST AND UPPER MISSISSIPPI VALLEY WILL MOVE OFF TO THE
EAST AS A COOL...CANADIAN HIGH PRESSURE SYSTEM BUILDS SOUTH ACROSS
THE GREAT LAKES FRIDAY NIGHT AND SPREAD ACROSS THE SRN GREAT LAKES
AND NRN IL/IN ON SATURDAY.  THE HIGH PRESSURE BUILDING FROM THE
NORTH WILL SET UP GENERALLY EASTERLY FLOW ACROSS THE REGION...
DRAWING COOLER AIR OFF OF LAKE MICHIGAN.  ALSO...DEWPOINTS WILL BE
MUCH LOWER WITH THIS AIRMASS...SO TEMPS SATURDAY MORNING SHOULD ONLY
BE IN THE MIDDLE TO UPPER 50S ACROSS THE NRN PORTIONS OF THE
CWA...WITH LOWER TO MIDDLE 60S OVER THE SOUTHERN LOCATION. BY
SATURDAY NIGHT...THE HIGH WILL MOVE OFF TO THE EAST...SETTING UP A
RETURN FLOW OF MOISTURE AND WARMER AIR...SO BY SUNDAY...TEMPERATURES
ACROSS THE AREA SHOULD REBOUND BACK INTO THE LOWER TO MIDDLE 80S.
IF SOME RESIDUAL SELY FLOW CAN LINGER OVER NERN IL...THE NERN IL
LAKESHORE AREA MAY STILL EXPERIENCE SOME LAKE COOLING WITH TEMPS
ONLY IN THE LOWER TO MIDDLE 70S.

THE MOST TRICKY FORECAST FOR THE EXTENDED FORECAST PERIOD WILL BE
FOR THURSDAY NIGHT INTO FRIDAY. AS THE LOW PRESSURE SYSTEM LIFTS OUT
OF THE CENTRAL PLAINS...AN ASSOCIATED WARM FRONT WILL LIFT NORTH
ACROSS THE REGION.  BY THURSDAY EVENING...EXPECT THE SFC LOW TO BE
OVER IOWA...WITH THE WARM FRONT EXTENDING TO THE EAST ACROSS NRN
IL/SRN LAKE MICHIGAN/NRN INDIANA.  EXACTLY HOW FAR NORTHERLY THE SFC
LOW TRACKS WILL DETERMINE THE NRN EXTENT OF THE THE WARM FRONT...AND
WITH IT...HOW FAR NORTH VERY WARM/MOIST AIR WILL SPREAD OVER THE
CWA.  THE MODELS ARE ACTUALLY IN VERY GOOD AGREEMENT ON TRACKING THE
SFC LOW CENTER LIFTING NEWD OUT OF THE SRN PLAINS TO CNTRL IOWA BY
THURSDAY EVENING AND THEN TURNING MORE EWD AS THE HIGH PRESSURE
BEGINS TO BUILD OUT OF CANADA.  SHOWERS AND THUNDERSTORMS PRODUCING
AN AREA OF HEAVY RAINFALL IS EXPECTED WITH THIS SYSTEM...BUT THE
HEAVIEST RAIN WILL LIKELY BE NORTH AND WEST OF THE CWA.  WITH THE
EXPECTED PATH OF THE LOW PRESSURE AND WITH THE WARM FRONT STALLING
OUT NEAR THE IL/WI BORDER...MUCH OF THE CWA SOUTH OF THE I-88
CORRIDOR WILL REMAIN IN A WARM/MOIST AIRMASS WHILE TO THE
NORTH...COOLER AIR SHOULD FILTER IN OVERNIGHT.  SO...LOCATIONS SOUTH
OF THE WARM FRONT SHOULD SEE LOW TEMPS FRIDAY MORNING IN THE LOWER
70S...WHILE LOCATIONS NEAR THE WI BORDER SHOULD SEE LOWS IN THE
UPPER 50S TO LOWER 60S.  A COLD FRONT TRAILING FROM THE LOW SHOULD
PUSH ACROSS THE AREA THROUGH THE DAY ON FRIDAY...SO LOCATIONS EAST
OF THE I-55 CORRIDOR COULD STILL SEE MAX TEMPS IN THE UPPER
80S...WHILE LOCATIONS ALONG AND WEST OF THE I-39 CORRIDOR TOP OUT IN
THE MIDDLE TO UPPER 70S.

KREIN

&&

.CLIMATE...

HIGHS OF 90 DEGREES PLUS ARE FORECAST ALONG AND SOUTH OF I-88
TODAY AND ARE POSSIBLE FOR THE ENTIRE FORECAST AREA. THIS IS
BASICALLY RIGHT ON PAR WITH NORMAL. FOR CHICAGO...THE NORMAL FIRST
90 DEGREE DAY IS JUNE 8 AND FOR ROCKFORD IS JUNE 11. DESPITE BEING
AT NORMAL...IF 90 WERE REACHED TODAY IT WOULD BE THE LATEST FIRST
90 DEGREE DAY FOR BOTH CITIES SINCE 2009.

MTF/KJB

&&

.AVIATION...

//ORD AND MDW CONCERNS...UPDATED 22Z...

* TSRA THRU EARLY EVENING.
* NORTHEAST WINDS 10-12KTS THRU EARLY EVENING.
* LOW MVFR CIGS THURSDAY MORNING.
* NORTHEAST WINDS 10KT THURSDAY.
* CHANCE OF SHRA/TSRA THURSDAY. CMS

//DISCUSSION...UPDATED 22Z...

TSRA DEVELOPING BETWEEN ORD/MDW AND THEN TO THE SOUTHWEST THRU JOT
TO VYS. THIS ACTIVITY WILL CONTINUE TO MOVE SOUTHEAST AND AWAY
FROM THE TERMINALS THRU EARLY THIS EVENING. PREVAILING NORTHEAST
WINDS 10-12KT WILL GRADUALLY DIMINISH UNDER 10 KT THIS EVENING.
CMS

PREVIOUS 18Z DISCUSSION...

GENERALLY QUIET CONDITIONS ACROSS THE TERMINALS AT THIS
TIME...WITH VFR CONDITIONS AND WESTERLY WINDS IN PLACE. STILL
ANTICIPATING CONDITIONS TO BECOME MORE COMPLICATED AROUND THE
TERMINALS LATER THIS AFTERNOON...WITH TSRA DEVELOPMENT AND
SHIFTING WINDS. LAKE BREEZE CAN BE OBSERVED PUSHING INLAND ACROSS
SOUTHERN WISCONSIN BUT STRONGER WESTERLY COMPONENT OVER NORTHEAST
ILLINOIS SHOULD HELP KEEP THE LAKE BREEZE NEAR THE SHORE FOR A
GOOD PORTION OF THE AFTERNOON. INCREASING MOISTURE/INSTABILITY
AHEAD OF SOUTHWARD MOVING FRONT AND MID LEVEL DISTURBANCE SHOULD
ALLOW FOR THUNDERSTORM DEVELOPMENT THIS AFTERNOON. THINK THIS
DEVELOPMENT WILL LIKELY OCCUR OVER THE TERMINALS...WITH A TREND
FOR THIS PRECIP TO SAG SOUTH AHEAD OF FRONT/LAKE BREEZE. DID MOVE
UP START TIME OF VCTS AS WELL AS DELAYED THE WIND SHIFT...AS THIS
SHIFT WILL LIKELY OCCUR ON THE BACKSIDE OF THE PRECIP. LATER THIS
EVENING...FURTHER PRECIP DEVELOPMENT WILL BE SOUTH OF THE
TERMINALS. ADDITIONAL PRECIP LIKELY DURING THE DAY THURSDAY...BUT
CONFIDENCE LOWER WITH REGARDS TO COVERAGE/DURATION AND ANY TS
TRENDS. DESPITE LOW CONFIDENCE...HAVE MAINTAINED MVFR CEILINGS
FOR THURSDAY AS WELL.

RODRIGUEZ

//ORD AND MDW CONFIDENCE...UPDATED 22Z...

* HIGH FOR TSRA THRU EARLY EVENING.
* HIGH FOR WINDS THRU THE PERIOD.
* LOW FOR MVFR CIGS THURSDAY MORNING.
* LOW FOR SHRA/TSRA THURSDAY. CMS

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

THURSDAY NIGHT...GOOD CHANCE OF TSRA. EAST WINDS.

FRIDAY...TSRA LIKELY. SOUTHWEST WINDS.

SATURDAY...IFR TO MVFR CIGS. NORTHEAST WINDS.

SUNDAY...GOOD CHANCE OF TSRA. SOUTH WINDS.

MONDAY AND TUESDAY...CHANCE OF TSRA. WEST-SOUTHWEST WINDS BECOMING
SOUTH ON TUESDAY.

KJB

&&

.MARINE...
245 PM CDT

CONDITIONS OVER LAKE MICHIGAN WILL LIKELY CONTINUE TO SUPPORT FOG
AT TIMES OVER THE NEXT SEVERAL DAYS...WITH MORE PERIODS OF DENSE
FOG POSSIBLE.

A COLD FRONT PUSHING ACROSS THE LAKE THIS AFTERNOON AND EVENING
COULD PROVIDE SOME TEMPORARY RELIEF FROM THE DENSEST FOG AS
COOLER/DRIER AIR FILERS IN BEHIND THE FRONT...ANOTHER STORM
SYSTEM IS EXPECTED TO APPROACH SOUTHERN LAKE MICHIGAN BY FRIDAY.
THIS SYSTEM WILL BRING PERIODS OF THUNDERSTORMS...BUT ALSO MAY
BRING SOME WARMER/MOISTER AIR BACK OVER THE COOL LAKE WATERS.
BRISK NELY WINDS SHOULD SET UP OVER THE LAKE IN ADVANCE OF THE
APPROACHING LOW PRESSURE SYSTEM... THE WARM FRONT...ASSOCIATED
WITH THE APPROACHING LOW...WILL THEN LIKELY LIFT OVER THE FAR
SOUTHERN END OF THE LAKE BY EARLY FRIDAY. THIS WILL RESULT IN THE
DEVELOPMENT OF A PERIOD OF GUSTY SLY TO SWLY WINDS OVER THE
SOUTHERN END OF THE LAKE...WITH NELY FLOW CONTINUING ON THE
NORTHERN PORTIONS OF THE LAKE.

PERIODS OF ACTIVE WEATHER WILL CONTINUE INTO NEXT WEEK PERIODIC
CHANCES FOR THUNDERSTORMS AND LOCALLY HIGHER WINDS AND WAVES.

KREIN

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...NONE.
&&

VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)

FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/NWSCHICAGO
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
336 PM CDT WED JUN 10 2015

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
112045-
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-
336 PM CDT WED JUN 10 2015

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

  WEATHER HAZARDS EXPECTED:

  THUNDERSTORMS...THE STRONGEST OF WHICH MAY PRODUCE:
   HEAVY RAINFALL AND LOCALIZED FLOODING.
   QUARTER SIZE HAIL OR LARGER.
   WIND GUSTS IN EXCESS OF 60 MPH.

  AREAS AFFECTED AND TIMING:

 AFTER 4 PM...THE CHANCE FOR STORMS WILL BE SOUTH OF I-88...WITH
 THE HIGHEST LIKELIHOOD ALONG AND SOUTH OF A PERU TO CHICAGO
 LINE. STORMS ARE EXPECTED TO INCREASE IN COVERAGE THROUGH
 SUNSET... THEN GRADUALLY FADE INTO THE OVERNIGHT. THE CHANCE FOR
 SEVERE STORMS AND HEAVY RAINFALL IS MAINLY BETWEEN 3 PM AND
 MIDNIGHT.

  DISCUSSION:

 A COLD FRONT IS MOVING SOUTHEAST THROUGH NORTHEAST ILLINOIS THIS
 AFTERNOON...AND A LAKE BREEZE IS MOVING INLAND AS WELL. THESE
 FEATURES WILL ENCOUNTER A VERY A WARM AND HUMID AIR MASS...AND
 LOOK TO SERVE AS A FOCUS FOR SCATTERED TO NUMEROUS STORMS. SOME
 OF THESE STORMS COULD BECOME SEVERE. SLOW STORM MOTIONS WILL
 ALSO SUPPORT THE THREAT FOR LOCALIZED FLOODING...ESPECIALLY FOR
 AREAS THAT HAVE HAD A HIGH AMOUNT OF RAINFALL SINCE LAST
 WEEKEND.

HEAT INDEX READINGS WILL HOLD CLOSE TO 100 DEGREES FOR SOME
ILLINOIS LOCATIONS MAINLY SOUTH OF INTERSTATE 88 AND AWAY FROM THE
LAKE THROUGH EARLY EVENING.

PORTIONS OF THE IROQUOIS AND KANKAKEE RIVERS WILL REMAIN IN FLOOD
STAGE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

PERIODS OF THUNDERSTORMS ARE PROBABLE THURSDAY THROUGH MONDAY.
WHILE THERE IS UNCERTAINTY ON SPECIFICS...THE PATTERN INDICATES
HEAVY RAINFALL WILL AT LEAST BE POSSIBLE MUCH OF THE TIME...AND
GIVEN AN ACTIVE PATTERN COULD PRESENT FLOODING CONCERNS. STRONG
WINDS...LARGE HAIL AND ISOLATED TORNADOES REMAIN A CONCERN ON
THURSDAY.

PORTIONS OF THE IROQUOIS AND KANKAKEE RIVERS WILL REMAIN IN FLOOD
STAGE THROUGH LATE THIS WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS MAY BE NEEDED THIS AFTERNOON AND EVENING.

&&

LMZ740>745-112045-
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-
336 PM CDT WED JUN 10 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.

THERE IS A GOOD CHANCE OF THUNDERSTORMS THIS AFTERNOON THROUGH
EARLY THIS EVENING...ESPECIALLY OVER THE CHICAGO AND NORTHERN
INDIANA NEAR SHORES. SOME OF THESE STORMS COULD PRODUCE WINDS IN
EXCESS OF 40 KT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

PERIODIC CHANCES FOR THUNDERSTORMS ARE POSSIBLE MUCH OF THIS
TIME...WITH THE EXCEPTION OF FRIDAY NIGHT AND SATURDAY.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-112045-
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-
336 PM CDT WED JUN 10 2015

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

AREAS OF DENSE FOG MAY REDEVELOP LATER TODAY OR TONIGHT.

THERE IS A CHANCE OF THUNDERSTORMS THIS AFTERNOON AND EVENING
ACROSS THE FAR SOUTHERN TIP OF THE LAKE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

DENSE FOG COULD PERSIST AT TIMES OVER PORTIONS OF THE LAKE ON
THURSDAY AND FRIDAY.

WINDS MAY BECOME HAZARDOUS TO SMALL CRAFT ON FRIDAY.

PERIODIC CHANCES FOR THUNDERSTORMS ARE POSSIBLE MUCH OF THIS
TIME...WITH THE EXCEPTION OF FRIDAY NIGHT AND SATURDAY.

&&

KMD

VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)

FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
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WWW.YOUTUBE.COM/NWSCHICAGO

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
625 PM CDT WED JUN 10 2015

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

0624 PM     HAIL             3 SW MIDWAY AIRPORT     41.75N 87.79W
06/10/2015  M0.25 INCH       COOK               IL   CO-OP OBSERVER

            0.51 RAIN FELL FROM 610 PM TO 619 PM.

&&

C

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
628 PM CDT WED JUN 10 2015

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

0615 PM     HAIL             ROMEOVILLE              41.65N 88.09W
06/10/2015  M0.50 INCH       WILL               IL   OFFICIAL NWS OBS

            QUARTER OF AN INCH TO HALF INCH HALF AT THE OFFICE.

&&

C

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
644 PM CDT WED JUN 10 2015

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

0635 PM     HEAVY RAIN       3 SW MIDWAY AIRPORT     41.75N 87.79W
06/10/2015  M1.10 INCH       COOK               IL   CO-OP OBSERVER

            RAIN SINCE 530 PM. 1/2 INCH HAIL.

&&

C

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
645 PM CDT WED JUN 10 2015

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

0635 PM     HAIL             CREST HILL              41.57N 88.11W
06/10/2015  E1.25 INCH       WILL               IL   TRAINED SPOTTER

&&

C

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
648 PM CDT WED JUN 10 2015

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

0647 PM     HAIL             ROMEOVILLE              41.65N 88.09W
06/10/2015  M1.00 INCH       WILL               IL   OFFICIAL NWS OBS

            NICKEL TO QUARTER SIZE HAIL. AT THE OFFICE.

&&

C

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
648 PM CDT WED JUN 10 2015

INZ002-110030-
PORTER IN-
648 PM CDT WED JUN 10 2015

...SPECIAL WEATHER STATEMENT FOR CENTRAL PORTER COUNTY UNTIL 730 PM
CDT...

AT 647 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
VALPARAISO...MOVING EAST AT 25 MPH.

HALF INCH HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
PORTAGE...             VALPARAISO...          CHESTERTON...
PORTER...              BURNS HARBOR...        SOUTH HAVEN...
LINCOLN HILLS...       KVPZ...                DUNE ACRES...

INCLUDING THE FOLLOWING INTERSTATES...
 INDIANA I-90 BETWEEN MILE MARKERS 26 AND 37.
 INDIANA I-94 BETWEEN MILE MARKERS 22 AND 32.

THIS INCLUDES...
VALPARAISO UNIVERSITY...INDIANA DUNES STATE PARK...AND PORTER COUNTY
FAIRGROUNDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 4146 8718 4165 8712 4168 8702 4166 8693
      4140 8693
TIME...MOT...LOC 2347Z 276DEG 24KT 4151 8707

BEACHLER