Special Weather Statement, NWS Chicago, IL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1254 AM CDT MON MAY 7 2012

.DISCUSSION...
743 PM CDT

MESOSCALE UPDATE...

CLUSTER OF SEVERE THUNDERSTORMS WHICH HAD FORMED ALONG WARM FRONTAL
BOUNDARY DURING THE AFTERNOON HAVE MOVED SOUTHEAST OF THE CWA AS OF
645 PM CDT. OUTFLOW BOUNDARY FROM THIS CLUSTER OF STORMS HAS PUSHED
THE EFFECTIVE SURFACE FRONT SOUTH OF THE CWA...TO AN APPROXIMATELY
GALESBURG...PEORIA...SOUTH OF CHAMPAIGN LINE PER RADAR FINE LINE
ECHO AND METAR OBSERVATIONS. FARTHER WEST...THE FRONT THEN EXTENDS
WEST INTO FAR SOUTHEAST IOWA TO A 1008 MB AREA OF SURFACE LOW
PRESSURE. ALOFT...SIGNIFICANT ELEVATED CAPE APPEARS TO BE PRESENT
STILL ACROSS EASTERN IA/NORTHERN IL PER SPC RAP OBJECTIVE ANALYSIS
FIELDS...AND INDEED THE 00Z RAOB FROM DVN AND RECENT AMDAR ASCENT
SOUNDINGS FROM ORD INDICATE LITTLE INHIBITION AND IN EXCESS OF 2000
J/KG FOR PARCELS FORCED FROM AROUND 900 MB. SURFACE/NEAR SURFACE
INSTABILITY REMAINS ALONG/SOUTH OF SURFACE FRONT PARTICULARLY FROM
SOUTHEAST IA/NORTHEAST MO INTO WEST CENTRAL IL WITH 3000 J/KG MLCAPE
ANALYZED IN SPC/RAP.

IN THE NEAR TERM...NEXT 1-2 HOURS...THE FORECAST AREA APPEARS TO BE
SOMEWHAT BETWEEN AREAS OF LARGER SCALE FORCING FOR ASCENT. ANALYSIS
OF LATE AFTERNOON PROFILER/VWP DATA SUGGESTS ONE MID-LEVEL SHORT
WAVE TROUGH AND ASSOCIATED 35 KT MID-LEVEL SPEED MAXIMA TRANSLATING
EAST ACROSS NORTHERN INDIANA AND LOWER MICHIGAN...WHILE ANOTHER WAS
LOCATED UPSTREAM ACROSS THE LOWER MISSOURI RIVER VALLEY REGION OF
WESTERN MO/SOUTHWEST IA WHERE ADDITIONAL CLUSTERS OF CONVECTION WERE
NOTED PER SATELLITE/RADAR/LIGHTNING DATA. ISOLATED THUNDERSTORMS
WERE DEVELOPING HOWEVER ACROSS FAR SOUTHEAST IOWA...IN
AFOREMENTIONED LOW LEVEL CAPE MAXIMA WHICH ALSO COINCIDES WITH
LOWEST ANALYZED LFC HEIGHTS. WEAK BUT PERSISTENT WARM/MOIST ASCENT
ATOP THE LOW LEVEL BOUNDARY/FRONT AND FALLING SURFACE PRESSURES
ACROSS WESTERN IL SUGGEST THIS CONVECTIVE ACTIVITY MAY EXPAND IN
COVERAGE OVER THE NEXT FEW HOURS...AND WILL LIKELY SPREAD BACK INTO
THE WEST/SOUTH PORTIONS OF THE CWA DURING THE MID-LATE EVENING HOURS
AS LOWER MISSOURI VALLEY SHORT WAVE APPROACHES FROM THE SOUTHWEST.
OTHER ELEVATED STORMS ACROSS SOUTHERN WI/LAKE MICHIGAN APPEAR TO BE
ASSOCIATED WITH CONVERGENT AXIS NOTED IN 925-850 MB VWP/PROFILER
ANALYSIS WHERE STRONGER SOUTH/SOUTHEAST FLOW IS NOTED... BUT WE MAY
SEE SOME OF THIS FILL BACK TO THE SOUTHWEST AS OVERALL FORCING FOR
DEEP ASCENT BECOMES MORE FAVORABLE BACK ACROSS WESTERN ILLINOIS.

DECREASING MID-LEVEL FLOW AND RESULTING DEEP LAYER SHEAR WILL LIKELY
REDUCE THE OVERALL SEVERE THREAT ACROSS THE AREA...WITH AREAS
CLOSER TO THE SURFACE WARM FRONT AND OUTFLOW BOUNDARIES IN THE FAR
SOUTH/SOUTHWEST CWA PERHAPS ABLE TO MAINTAIN SOME MINIMAL THREAT FOR
HAIL/DAMAGING WINDS FOR STORMS ROOTED CLOSER TO THE SURFACE/BOUNDARY
LAYER. OTHERWISE THE MAIN THREATS INTO THE OVERNIGHT HOURS FOCUS ON
THE POTENTIAL FOR ADDITIONAL HEAVY RAINFALL...PARTICULARLY WHERE
PREVIOUS STORMS HAVE PRODUCED VERY HEAVY RAINFALL SOUTH OF I-80 THIS
AFTERNOON. AXIS OF VERY MOIST 925-850 MB LAYER WITH DEW POINTS 16-20
DEG C...PWATS OF 1.5-1.8...DIFFLUENT DEEP LAYER THICKNESS FIELD
ACROSS THE SOUTHEAST CWA...AND APPROACHING SHORT WAVE ALL POINT TO
CONTINUED HEAVY RAIN THREAT.

BASED ON ABOVE...AND IN COORDINATION WITH SPC AND WFO ILX...WILL GO
AHEAD AND CANCEL SEVERE THUNDERSTORM WATCH 258 AT THIS TIME BUT
WILL MAINTAIN FLASH FLOOD WATCH.

RATZER

//PREV DISCUSSION...
358 PM CDT

FORECAST CONCERNS HAVE BEEN CENTERED ON THE SHORT TERM...FROM NOW
THROUGH MONDAY WITH ONGOING CONVECTIVE AND HEAVY RAIN THREAT.

TONIGHT...A VERY CHALLENGING FORECAST AS ONGOING CONVECTION MAY
ALTER THE ATMOSPHERE ENOUGH TO HAVE A MAJOR IMPACT ON HOW
WIDESPREAD THE ACTIVITY TONIGHT MAY BE. IN GENERAL...THE TREND
WITH THE FORECAST WAS TO FOCUS THE HIGHER RAINFALL AMOUNTS FOR
TONIGHT FURTHER SOUTH IN THE FORECAST AREA...MAINLY SOUTH OF
INTERSTATE 88...WITH AN EMPHASIS SOUTH OF INTERSTATE 80.

CONVECTIVE COMPLEX EVOLVING FROM THE LACON AREA EASTWARD TOWARD
JUST SOUTH OF KANKAKEE HAS BEEN VERY SLOW MOVING...AND IS ROOTED
ALONG THE LOW-LEVEL THERMAL BOUNDARY WHERE CONVERGENCE IS
MAXIMIZED. A GRADUAL MCV OR COLD POOL EVOLUTION IS FAVORED...WHICH
SHOULD HELP TO PROGRESS THIS SOUTHEAST. CONTINUED MOISTURE
TRANSPORT INTO THE REGION THROUGH THIS EVENING WILL LIKELY OFFSET
THIS OVERALL MOTION SOME...LEADING TO POTENTIALLY VERY HEAVY
RAINFALL AMOUNTS TOWARD 4-5 INCHES IN PLACES. BULK SHEAR IS
MARGINAL...HOWEVER THE STORMS HAVE ALREADY THIS AFTERNOON SHOWN
THEMSELVES AS BEING ORGANIZED AND ROOTED IN THE SURFACE. SO A
SUSTAINED COLD POOL WILL LIKELY HELP IN POTENTIALLY PRODUCING
WIND...AS WELL AS AN ONGOING HAIL THREAT...ESPECIALLY THIS
EVENING.

TO THE NORTH OF THIS AREA...THE MOISTURE TRANSPORT IS
LESS...HOWEVER SHORT CONTINUED BROAD QG FORCING AND SHORT WAVE
RIPPLES ARE LIKELY TO TRIGGER AT LEAST SOME ELEVATED ACTIVITY.
MUCAPE VALUES ARE DIAGNOSED AT OVER 2000 J/KG PER THE RAP MODEL
BACK INTO NW AND NORTH CENTRAL IL. WHILE THE LOW-LEVEL AIR IS
SOMEWHAT WORKED OVER...THIS UPPER INSTABILITY AND CONTINUE HIGH
PWAT AIR IS ENOUGH TO HAVE HEAVY RAIN WITH A SCATTERED SEVERE
THREAT. HIGH RES MODELS VARY SIGNIFICANTLY ON HOW THIS WILL PAN
OUT. SO HOW WIDESPREAD THE CONVECTION FURTHER NORTH WILL BECOME IS
HIGHLY UNCERTAIN...ESPECIALLY DUE TO THE ONGOING CONVECTION TO THE
SOUTH. A CONTINUED HEAVY RAIN THREAT WILL EXIST WITH ANY
CONVECTION TO THE NORTH AS WELL...SO WILL CONTINUE THE FLASH FLOOD
WATCH ALL THE WAY TO THE WI BORDER.

MONDAY...SOME CONVECTION WILL LIKELY LINGER MONDAY MORNING AND
POSSIBLY EARLY AFTERNOON AS THE SYNOPTIC COLD FRONT EVOLVES EAST.
THE LOW-LEVEL JET FOCUS WILL BE MORE TO THE SOUTHEAST
HOWEVER...SO THE EMPHASIS FOR HEAVY RAIN AND THE SEVERE THREAT
SHOULD BE DIMINISHING. LINGERING CLOUD COVER WILL LIKELY IMPEDE
TEMPERATURES FROM CLIMBING MUCH THROUGH THE MORNING. A STRONGER
NORTHWEST PUSH IS LIKELY IN THE AFTERNOON...AIDING IN SCOURING OF
THE CLOUD COVER.

TUESDAY AND BEYOND...LITTLE CHANGES MADE TO THE GOING FORECAST FOR
THIS PERIOD DUE TO ONGOING SEVERE AND HEAVY RAIN THREATS. THE
POSTIIVELY TITLED UPPER TROUGH CENTERED OVER SOUTHERN MANITOBA
WILL GRADUALLY WORK EAST ACROSS THE WESTERN GREAT LAKES TUESDAY
NIGHT INTO WEDNESDAY...POSSIBLY BRINGING SOME SHOWERS.

MTF

&&

.AVIATION...

//ORD AND MDW CONCERNS...UPDATED 06Z...

* THUNDERSTORMS THROUGH SUNRISE.
* SHOWERS THROUGH EARLY AFTERNOON.
* MVFR CIGS THROUGH EARLY AFTERNOON.
* POSSIBLE IFR CIGS TOWARD SUNRISE THROUGH MID MORNING.
* POSSIBLE WIND SHIFT TO THE EAST LATE THIS AFTERNOON. CMS

//DISCUSSION...UPDATED 06Z...

SHOWERS AND THUNDERSTORMS WIDESPREAD ACROSS NORTHERN IL AND
NORTHWEST INDIANA EARLY THIS MORNING WITH ADDITIONAL ACTIVITY
STILL DEVELOPING FURTHER TO THE WEST AND EXPECT THIS TO CONTINUE
FOR SEVERAL MORE HRS THOUGH WITH TIME THE THUNDER THREAT MAY SAG
SOUTH OF THE TERMINALS TOWARD SUNRISE. BULK OF THIS ACTIVITY IS
ELEVATED AND EVEN IN THE HEAVIEST RAINS CIGS/VIS ONLY BRIEFLY
DIPPING INTO IFR WITH PREVAILING MVFR/VFR. SHOWERS THEN EXPECTED
TO CONTINUE THIS MORNING THOUGH COVERAGE/INTENSITY SHOULD BE
DECREASING BY MID/LATE MORNING.

LOW PRESSURE WILL SLOWLY LIFT EAST/NORTHEAST REACHING NORTHERN
INDIANA BY LATE MORNING. BUT AS THE LOW PASSES JUST SOUTH OF THE
TERMINALS...THERE COULD BE A PERIOD OF IFR CIGS. CONFIDENCE OF
THIS OCCURRING IS FAIRLY LOW AND FOR NOW HAVE JUST SCATTERED
MENTION IN THE TAFS. AS THE LOW SHIFTS EAST CIGS SHOULD SLOWLY
IMPROVE...ESPECIALLY IF IFR CIGS DEVELOP.

WINDS SHOULD REMAIN NORTHERLY THROUGH THIS AFTERNOON AND THEN
POSSIBLY SHIFT TO THE NORTHEAST OR EVEN EAST SHOULD A LAKE
BREEZE DEVELOP. CONFIDENCE REMAINS LOW AND EVENTUALLY WINDS WILL
SHIFT BACK NORTHWESTERLY LATER THIS EVENING. CMS

//ORD AND MDW CONFIDENCE...UPDATED 06Z...

* HIGH CONFIDENCE SHRA/TSRA WILL CONTINUE THROUGH 09Z-10Z.
* HIGH CONFIDENCE SHRA WILL CONTINUE THROUGH MID MORNING...LOW
  CONFIDENCE REGARDING TSRA POTENTIAL.
* MEDIUM CONFIDENCE REGARDING CIGS...LOW CONFIDENCE REGARDING IFR
  POTENTIAL.
* MEDIUM CONFIDENCE REGARDING WINDS...LOW CONFIDENCE REGARDING
  LAKE BREEZE/SHIFT TO THE EAST LATE THIS AFTERNOON. CMS

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

TUESDAY...VFR...SLIGHT CHANCE OF SHOWERS.

WEDNESDAY...VFR...CHANCE OF SHOWERS.

THURSDAY...VFR.

FRIDAY...VFR.

SATURDAY...VFR...CHANCE OF SHOWERS.

LENNING

&&

.MARINE...
256 AM CDT

HIGH PRESSURE CONTINUES TO STRETCH FROM WESTERN HUDSON BAY SOUTHEAST
INTO NORTHERN NEW ENGLAND. LOW PRESSURE CENTERED OVER THE OK/TX
PANHANDLE REGION WILL DRIFT EASTWARD TODAY WITH AN INVERTED TROUGH
STRETCHING TO ITS NORTH. THIS TROUGH AXIS THEN ARCS NORTHWESTWARD TO
A DEVELOPING LOW OVER SOUTHERN SASKATCHEWAN. EASTERLY WINDS WILL
CONTINUE THIS MORNING BEFORE A WARM FRONTAL BOUNDARY SETS UP ACROSS
THE CENTRAL PART OF THE LAKE. THIS WILL ALLOW WINDS ACROSS THE NORTH
TO TURN NORTHEASTERLY AND TO A MORE SOUTHEASTERLY DIRECTION ACROSS
THE SOUTHERN PART OF THE LAKE. THE SURFACE LOW WILL WEAKEN AS IT
CROSSES THE SOUTHERN PART OF THE LAKE MONDAY MORNING. WINDS WILL
TURN NORTHERLY ACROSS THE ENTIRE LAKE AS THE LOW MOVES TO THE EAST
MONDAY AFTERNOON. THE SASKATCHEWAN LOW WILL THEN CROSS THE LAKE AS
MORE OF AN OPEN TROUGH THAN A CLOSED LOW. FAIRLY STRONG HIGH
PRESSURE WILL FOLLOW IN ITS WAKE LEADING TO A PERIOD OF ELEVATED
WINDS WEDNESDAY THANKS TO AN INCREASED PRESSURE GRADIENT. THE HIGH
WILL THEN SLOWLY MOVE EAST ACROSS THE REGION THROUGH THE END OF THE
WEEK KEEPING A NORTHERLY WIND THROUGH THURSDAY WITH A FLIP TO A
SOUTHERLY DIRECTION FRIDAY. THERE IS THEN GOOD AGREEMENT ON A FRONT
CROSSING THE REGION AGAIN SATURDAY WITH ANOTHER AREA OF HIGH
PRESSURE BUILDING IN BEHIND IT.

MDB

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...FLASH FLOOD WATCH...ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-
     ILZ011-ILZ012-ILZ013-ILZ014-ILZ019-ILZ020-ILZ021-ILZ022-
     ILZ023-ILZ032-ILZ033-ILZ039 UNTIL 7 AM MONDAY.

IN...FLASH FLOOD WATCH...INZ001-INZ002-INZ010-INZ011-INZ019 UNTIL 7
     AM MONDAY.

LM...NONE.
&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
901 PM CDT SUN MAY 6 2012

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
080215-
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-
901 PM CDT SUN MAY 6 2012 /1001 PM EDT SUN MAY 6 2012/

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

.DAY ONE...TONIGHT.

  WEATHER HAZARDS EXPECTED:

  THUNDERSTORMS...SOME MAY PRODUCE...
   HEAVY RAINFALL...PRODUCING LOCALIZED FLASH FLOODING
   HAIL TO THE SIZE OF GOLF BALLS
   WIND GUSTS IN EXCESS OF 60 MPH
   CLOUD TO GROUND LIGHTNING

  AREAS AFFECTED AND TIMING:

   ISOLATED THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS EVENING
   ACROSS NORTHERN ILLINOIS AND NORTHWEST INDIANA AND CONTINUE
   THROUGH THE OVERNIGHT PERIOD.

  DISCUSSION:

  VERY MOIST ATMOSPHERE REMAINS OVER NORTHERN ILLINOIS AND
  NORTHWEST INDIANA THIS EVENING...AND WILL CONTINUE THROUGH
  THE OVERNIGHT PERIOD. THE MAIN FOCAL POINT FOR ADDITIONAL
  THUNDERSTORMS TO DEVELOP WILL BE ALONG A FRONTAL BOUNDARY
  THAT HAS PUSHED SOUTH OF U.S. HIGHWAY 24 OR ALONG AND SOUTH
  OF A FAIRBURY ILLINOIS TO KENTLAND INDIANA LINE. ISOLATED
  THUNDERSTORMS ARE EXPECTED TO DEVELOP NORTH OF THIS BOUNDARY
  THIS EVENING AND MAY STRENGTHEN TO ISOLATED SUPERCELLS.
  THE THREAT FOR HEAVY RAINFALL IS HIGH WITH THIS ACTIVITY.

  HIGHER AMOUNTS ARE LIKELY...ESPECIALLY IN SOUTHERN AREAS.
  LOCALIZED FLASH FLOODING MAY RESULT IN THOSE COMMUNITIES THAT
  SEE THESE MAXIMUM RAINFALL AMOUNTS.

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

THUNDERSTORMS ARE LIKELY DURING THE DAY ON MONDAY ACROSS A LARGE
PORTION OF THE AREA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT.

&&

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

LMZ740>745-080215-
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-
901 PM CDT SUN MAY 6 2012

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 CHANCE OF THUNDERSTORMS TONIGHT. SOME OF THESE STORMS
MAY PRODUCE WIND GUSTS ABOVE 34 KNOTS.

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

THERE IS A CHANCE OF THUNDERSTORMS MONDAY.

&&

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-
870-872-874-876-878-080215-
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-
901 PM CDT SUN MAY 6 2012

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

.DAY ONE...TONIGHT.

THERE IS A CHANCE OF THUNDERSTORMS TONIGHT...MAINLY ACROSS THE
SOUTHERN HALF OF THE LAKE. SOME OF THESE STORMS MAY PRODUCE WIND
GUSTS ABOVE 34 KNOTS...MAINLY ACROSS FAR SOUTHERN LAKE MICHIGAN.

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

THERE IS A CHANCE OF THUNDERSTORMS MONDAY.

&&

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

BEACHLER

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1235 AM CDT MON MAY 07 2012

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

1230 AM     FLASH FLOOD      3 SW MORRIS             41.34N 88.47W
05/07/2012                   GRUNDY             IL   LAW ENFORCEMENT

            WEST SOUTHMOR ROAD SOUTHWEST OF THE TOWN CENTER
            IMPASSABLE DUE TO FLOODING.

&&

RC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1255 AM CDT MON MAY 07 2012

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

1250 AM     FLASH FLOOD      CEDAR LAKE              41.37N 87.44W
05/07/2012                   LAKE               IN   LAW ENFORCEMENT

            ROADS CLOSED DUE TO FLASH FLOODING. 133RD AVENUE HAS
            ABOUT 3.5 OF WATER COVERING ROAD...WITH 2.5 TO 3 FEET OF
            WATER COVERING LAKESHORE DRIVE.

&&

RC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1259 AM CDT MON MAY 07 2012

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

1257 AM     HEAVY RAIN       HEBRON                  41.32N 87.20W
05/07/2012  M2.87 INCH       PORTER             IN   TRAINED SPOTTER

            2.87 INCHES SINCE 1030 PM CDT. STILL RAINING VERY
            HEAVILY.

&&

RATZER

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
138 AM CDT MON MAY 07 2012

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

0137 AM     HEAVY RAIN       HEBRON                  41.32N 87.20W
05/07/2012  M4.47 INCH       PORTER             IN   TRAINED SPOTTER

            4.47 INCHES SINCE 1030 PM CDT. 1.60 INCHES IN THE LAST 40
            MINUTES.

&&

RATZER

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
210 AM CDT MON MAY 7 2012

ILZ033-INZ010-011-019-070815-
BENTON IN-IROQUOIS IL-JASPER IN-NEWTON IN-
210 AM CDT MON MAY 7 2012

...SPECIAL WEATHER STATEMENT...

AT 207 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM GIFFORD TO REMINGTON TO
STOCKLAND...MOVING EAST AT 30 MPH.

ONE HALF INCH DIAMETER HAIL...WINDS UP TO 50 MPH...FREQUENT CLOUD TO
GROUND LIGHTNING... AND TORRENTIAL RAINFALL ARE POSSIBLE WITH THIS
LINE OF THUNDERSTORMS.

LOCATIONS IMPACTED INCLUDE...GIFFORD...MOODY...AND PLEASANT RIDGE
AROUND 215 AM...TALBOT...BARCE...AND FOWLER AROUND 330 AM...ATKINSON
AND TEMPLETON AROUND 345 AM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE
OBJECTS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS
TREES. HEAVY RAINFALL COULD LEAD TO STANDING WATER ON ROADWAYS AND
POOR VISIBILITY. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE
STORMS HAVE PASSED.

LAT...LON 4091 8698 4084 8699 4083 8709 4047 8710
      4047 8750 4054 8783 4083 8731 4115 8713
      4111 8693 4091 8693
TIME...MOT...LOC 0709Z 286DEG 25KT 4104 8705 4081 8718
          4057 8761

RATZER