Flash Flood Warning 4, NWS Chicago, IL

142 
WGUS73 KLOT 180002
FFSLOT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
702 PM CDT WED APR 17 2013

ILC031-INC089-180130-
/O.CON.KLOT.FF.W.0004.000000T0000Z-130418T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COOK IL-LAKE IN-
702 PM CDT WED APR 17 2013

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHWESTERN LAKE AND
SOUTHEASTERN COOK COUNTIES UNTIL 830 PM CDT...

AT 654 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL CONTINUING TO MOVE ACROSS THE 
WARNED AREA. THIS IS A PARTICULARLY FLASH FLOOD PRONE REGION...WITH 
HEAVY RAINFALL LIKELY RESULTING IN CONTINUED FLOODING OF STREETS AND 
VIADUCTS THIS EVENING. ADDITIONAL THUNDERSTORMS AND MORE HEAVY 
RAINFALL ARE LIKELY TONIGHT...WHICH COULD LEAD TO MORE POSSIBLE 
FLASH FLOODING. 

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...BLUE
ISLAND...BURNHAM...CALUMET CITY...CHATHAM...CHICAGO HEIGHTS...
DOLTON...EAST CHICAGO...FLOSSMOOR...GARY...GLENWOOD...GRIFFITH...
HAMMOND...HIGHLAND...LANSING AND LYNWOOD.

LOCAL MEDIA REPORTS HAD NOTED STREET FLOODING NEAR CLINE AVENUE AND 
CHICAGO AVENUE IN GARY INDIANA...WITH SOME STREETS REPORTED BEING 
IMPASSABLE.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE ELEVATED LEVELS ON SMALL
CREEKS AND STREAMS...PONDING OF WATER ON ROADS...URBAN AREAS...
HIGHWAYS... UNDERPASSES AND LOW LYING AREAS.

&&

LAT...LON 4152 8731 4148 8777 4162 8776 4172 8766
      4176 8754 4175 8752 4171 8752 4169 8749
      4168 8745 4169 8743 4168 8741 4165 8742
      4163 8732

$$

RODRIGUEZ

205 
WGUS73 KLOT 180129
FFSLOT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
829 PM CDT WED APR 17 2013

ILC031-INC089-180141-
/O.EXP.KLOT.FF.W.0004.000000T0000Z-130418T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COOK IL-LAKE IN-
829 PM CDT WED APR 17 2013

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHWESTERN LAKE
AND SOUTHEASTERN COOK COUNTIES WILL BE ALLOWED TO EXPIRE AT 830 PM
CDT...

RAPID EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. 
ALTHOUGH THREAT OF RAPID FLASH FLOODING HAS GREATLY DIMINISHED... 
STREAMS AND CREEKS IN THE WARNED AREA WILL REMAIN AT HIGH LEVELS AND 
ADDITIONAL MODERATE TO LOCALLY HEAVY RAINFALL IS POSSIBLE INTO 
THURSDAY. AN AERIAL FLOOD WARNING REMAINS IN EFFECT FOR THE AREA 
UNTIL NOON THURSDAY. 

LAT...LON 4152 8731 4148 8777 4162 8776 4172 8766
      4176 8754 4175 8752 4171 8752 4169 8749
      4168 8745 4169 8743 4168 8741 4165 8742
      4163 8732

$$

RATZER

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
422 PM CDT WED APR 17 2013

.DISCUSSION...
342 PM CDT

.SHORT TERM...THROUGH FRIDAY...

HAZARDOUS WEATHER ISSUES FROM SEVERE THUNDERSTORMS TO EXCESSIVE
RAINFALL TO TORNADIC POTENTIAL WILL IMPACT THE REGION THROUGH
THURSDAY NIGHT.

FOR THE REMAINDER OF THE AFTERNOON AND INTO THIS EVENING...AT 230PM
CDT...STRONG THUNDERSTORMS EXTEND ALONG A LINE FROM NEAR
WAUKEGAN...SOUTHWEST THROUGH OTTAWA.  WEST OF THIS LINE...AN
EXTENSIVE AREA OF OVERRUNNING PCPN WITH EMBEDDED THUNDER EXTENDED
BACK THROUGH ERN IOWA AND MISSOURI.  MUCH OF THE ACTIVITY OVER NRN
IL HAS FORMED ALONG AN ELEVATED WARM FRONT...BUT A MORE SOLID LINE
HAS DEVELOPED IN THE WARM SECTOR.  EXPECT THAT THE THUNDERSTORMS
WILL SAG SEWD THROUGH THE EVENING...BRINGING SHOWERS AND
THUNDERSTORMS INTO EAST-CENTRAL ILLINOIS AND NORTHWESTERN INDIANA.
WITH COPIOUS AMOUNTS OF MOISTURE STREAMING INTO THE REGION...THE
STORMS HAVE BEEN VERY EFFICIENT RAIN PRODUCERS...WITH 0.81 INCHES OF
RAIN MEASURED AT THE ROCKFORD AIRPORT BTWN 12-18Z THIS MORNING.
STORMS HAVE ALSO BEEN MARGINALLY SEVERE WITH NUMEROUS REPORTS OF
SMALL HAIL RECEIVED...AND A FEW REPORTS OF LARGER HAIL AS WELL.
THIS WILL BE THE CONVECTIVE MODE FOR THE REMAINDER OF THE EVENING
AND OVERNIGHT TONIGHT...WITH MODERATE TO HEAVY RAIN AND SMALL HAIL
AND OCCASIONAL STRONG WINDS GUSTS.

THE FLOODING AND SEVERE WEATHER POTENTIAL WILL RAMP UP EVEN FURTHER
TOMORROW AS THE UPPER TROUGH MOVES OUT OVER THE CENTRAL PLAINS AND A
SFC LOW DEEPENS.  THE SFC LOW WILL SWING THROUGH THE SOUTH HIGH
PLAINS EARLY THIS EVENING BEFORE TURNING NEWD...RIPPLING ALONG A
QUASI-STATIONARY COLD FRONT AND WARM FRONT.  BY THURSDAY
MORNING...THE LOW WILL ELONGATE FROM NWRN IL THROUGH NWRN MO...WITH
THE SFC WARM FRONT EXTENDING NEWD ACROSS CENTRAL LAKE MICHIGAN.
THIS WILL PUT THE CWA FIRMLY IN THE WARM SECTOR.  WITH A WIDE OPEN
GLFMEX...DEEP LAYER MOISTURE WILL STREAM NWD INTO THE REGION...WITH
PWATS EXCEEDING 1.5 INCHES FOR AN EXTENDED PERIOD OF TIME...LEADING
TO THE POTENTIAL FOR SIGNIFICANT WIDESPREAD RIVER AND AREAL
FLOODING.  SEE THE HYDROLOGY SECTION FOR FURTHER DETAILS.

THE SEVERE WEATHER MODE SHOULD FOCUS ON STRONG...DAMAGING WINDS AND
POSSIBLE TORNADOES.  THE LATEST SPC DAY 2 CONVECTIVE OUTLOOK HAS
INCREASED THE AREA SOUTH OF A LINE FROM EVANSTON TO PONTIAC TO A
MODERATE RISK...WITH THE REMAINDER OF THE AREA IN A SLIGHT RISK.
INCREASING HEAT AND MOISTURE...TEMPERATURES REACHING INTO THE LOW TO
MIDDLE 70S AND DEWPOINTS IN THE LOW TO MIDDLE 60S IN THE WARM
SECTOR...INSTABILITY WILL BE AMPLE.  WHILE THE GENERAL CONVECTIVE
MODE WILL BE LINEAR WITH SMALL LINES AND BOWS POSSIBLE...PRODUCING
DAMAGING WINDS...THE MODEL GUIDANCE IS IN GOOD AGREEMENT ON A STRONG
LOW LEVEL JET...WITH SWLY WINDS OF 55-65KT ACROSS THE REGION.  WHILE
SFC WINDS ARE GENERALLY PROGGED TO BE SOUTHERLY...THERE WILL BE
OPPORTUNITY FOR SFC WINDS TO BACK A LITTLE MORE EAST OF SOUTH AS THE
SFC LOW TRACKS THROUGH NWRN IL AND INTO SRN WI.  GIVEN THE AMPLE
INSTABILITY...COMBINED WITH CLOCKWISE TURNING HODOGRAPHS...DISCRETE
SUPERCELLS MAY DEVELOP OUT IN THE WARM SECTOR AHEAD OF THE LINEAR
CONVECTION...WHICH WOULD BRING THE TORNADIC POTENTIAL TO THE
REGION.

THE POTENTIAL FOR SEVERE WEATHER AND HEAVY RAINFALL WILL CONTINUE
UNTIL THE ASSOCIATED COLD FRONT PUSHES THROUGH THE REGION...BRINGING
IN MUCH COOLER AIR.  THE GUIDANCE IS IN GOOD AGREEMENT ON PUSHING
THE FRONT ACROSS THE AREA THURSDAY EVENING.  AS THE SFC LOW PUSHES
OFF TO THE NORTHEAST...THE UPPER TROUGH WILL ALSO CROSS THE AREA.
WITH PLENTY OF RESIDUAL SFC MOISTURE AND COOLER AIR AND CYCLONIC
CURVATURE ALOFT...SOME LINGERING INSTABILITY SHOWERS SHOULD PERSIST
INTO FRIDAY. HIGHS ON FRIDAY SHOULD DROP BACK INTO THE MIDDLE TO
UPPER 40S.

KREIN

.LONG TERM - SATURDAY THROUGH WEDNESDAY...

SPRAWLING SURFACE HIGH PRESSURE TO BUILD INTO THE AREA SATURDAY
BEHIND DEPARTING SURFACE LOW/UPPER LEVEL TROUGH.  A RETURN TO
UNSEASONABLY COOL TEMPS WITH A NEEDED BREAK IN PRECIPITATION WILL BE
SHORT LIVED HOWEVER AS THE UPPER FLOW QUICKLY RETURNS SOUTHWESTERLY
AS ANOTHER POWERFUL SHORTWAVE TROUGH DIGS INTO WESTERN NORTH AMERICA
ON SUNDAY.  THIS SHORTWAVE CARVES OUT A TROUGH ACROSS THE MOUNTAIN
WEST SUNDAY NIGHT INTO MONDAY.

A SERIES OF UPPER LEVEL SHORT WAVE TROUGHS WILL THEN RIPPLE
NORTHEAST IN THE SW FLOW ALOFT.  SPECIFIC FEATURES ARE POORLY
RESOLVED BY MEDIUM RANGE MODELS BUT OVERALL TREND WILL BE A RETURN
TO INCREASING MOISTURE AS GULF OPENS BACK UP AGAIN. MEDIUM RANGE
MODELS ARE IN FAIRLY GOOD AGREEMENT IN CONCEPT IN SAGGING THE
SURFACE FRONTAL BOUNDARY SOUTH ACROSS THE LOCAL AREA MONDAY NIGHT
AND STALLING IT OUT TUESDAY SETTING THE STAGE FOR ANOTHER PROLONGED
PERIOD OF WET WEATHER TUESDAY INTO WEDNESDAY AS RIPPLES OF LOW
PRESSURE LIFT NORTHEAST ALONG THE BOUNDARY.

EF

&&

.HYDROLOGY...
350 PM CDT

WITH SFC DEWPOINTS EXPECTED TO REACH INTO THE LOWER TO MIDDLE 60S
AND PWATS POSSIBLY REACHING AS HIGH AS 1.75 INCHES...ANY
THUNDERSTORMS THAT DEVELOP WILL BE EFFICIENT RAIN PRODUCERS. BASED
ON THE MATT BUNKERS PWAT CLIMATOLOGY...THESE VALUES APPROACH
RECORD LEVELS. SO...FLOODING WILL BE A MAJOR CONCERN FOR THE
ENTIRE CWA...WITH STORM TOTAL PCPN AMOUNTS OF 2-3 INCHES OVER THE
SERN PORTIONS OF THE CWA...GENERALLY SOUTH OF I-80...AND 3-4
INCHES TO THE NORTH. LATEST LOCAL QPF WOULD SUGGEST AN AREA OF
PCPN OF 4-5 INCHES IS POSSIBLE ALONG OVER NORTHERN ILLINOIS. THIS
REPRESENTS AN INCREASE OVER PREVIOUS FORECASTS...BUT GIVEN THE
RECORD LEVEL PWATS FOR AN EXTENDED PERIOD OF TIME...CONFIDENCE IS
INCREASING FOR THIS SIGNIFICANT RAINFALL. WITH MANY RIVERS AND
STREAMS ARE ALREADY NEAR OR ABOVE MINOR FLOOD STAGE...THIS AMOUNT
OF RAIN WILL BRING ADDITIONAL RISES TO MODERATE AND MAJOR FLOOD
LEVEL. IN ADDITION TO RIVER FLOODING...AREAL FLOODING OR
RURAL...SUBURBAN AND URBAN AREAS IS LIKELY...WITH LOW LYING ROADS
AND VIADUCTS FLOODING...AS WELL AS...ROADSIDE DRAINAGE DITCHES AND
DRAINAGE PONDS EXCEEDING CAPACITY. AREAS NOT SEEING FLOODING WILL
AT LEAST SEE AREAS OF STANDING OR PONDING WATER ON ROADS.

KREIN

&&

.AVIATION...

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

* SHOWERS AND THUNDERSTORMS CONTINUING THROUGH THE EVENING.
  SHOWERS CONTINUING INTO THE OVERNIGHT HOURS.
* GUSTY EASTERLY WINDS THE REST OF THIS AFTERNOON AND
  EVENING...SHIFTING TO SOUTHERLY OVERNIGHT.
* IFR CEILINGS CONTINUING AT ORD...AND DEVELOPING AT MDW BY
  EVENING.

PAW

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

FRONTAL BOUNDARY IS ACROSS CENTRAL ILLINOIS AND INDIANA AT 18Z.
A SERIES OF LOW PRESSURE CENTERS MOVING NORTHWARD THROUGH THE
MISSISSIPPI VALLEY THROUGH THURSDAY WILL HELP TO MOVE THE FRONTAL
BOUNDARY TO THE NORTH...PASSING THE TERMINALS DURING THE OVERNIGHT
HOURS. AN INITIAL AREA OF SHOWERS AND THUNDERSTORMS THAT DEVELOPED
TO THE NORTH OF THE FRONTAL BOUNDARY LINGERS IN THE TERMINAL
AREAS AT MIDDAY. ANOTHER ROUND OF MORE NUMEROUS AND STRONGER
SHOWERS AND THUNDERSTORMS IS APPROACHING FROM THE WEST...AND WILL
GET INTO RFD EARLY THIS AFTERNOON AND THE CHICAGO AREA TERMINALS
BY MID AFTERNOON. THEN ADDITIONAL AREAS OF SHOWERS AND
THUNDERSTORMS CAN BE EXPECTED WHILE THE FRONTAL BOUNDARY IS IN THE
VICINITY THROUGH THURSDAY.

WINDS WILL SHIFT TO THE SOUTH WHEN THE FRONTAL BOUNDARY PASSES
TONIGHT. CEILINGS AND VISIBILITIES WILL SLOWLY LOWER TO IFR OR LOW
END MVFR VALUES WITH THE SHOWERS AND THUNDERSTORMS THIS
EVENING...WITH LITTLE IMPROVEMENT INTO THE DAY THURSDAY.

PAW

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

* MEDIUM CONFIDENCE IN TIMING AND DETAILS OF SHOWERS AND
  THUNDERSTORMS THROUGH THE EVENING.
* HIGH CONFIDENCE IN WIND TREND.
* MEDIUM CONFIDENCE IN CEILING DETAILS.

PAW

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

THURSDAY NIGHT...TSRA LIKELY MAINLY IN THE EVENING. PERIODS OF IFR.

FRIDAY...CHANCE SHRA. PERIODS OF MVFR.

SATURDAY...VFR.

SUNDAY...VFR.

MONDAY AND TUESDAY...VFR. CHANCE SHRA.

KJB

&&

.MARINE...
420 PM CDT

A PAIR OF LOW PRESSURE CENTERS OVER NORTHERN MISSOURI AND THE
TEXAS PANHANDLE WILL MOVE NORTHEAST TONIGHT AND THURSDAY AND
OVERSPREAD THE GREAT LAKES AREA. A BRIEF PERIOD OF OCCASIONALLY
GALE FORCE GUSTS WILL OCCUR ACROSS SOUTHERN LAKE MICHIGAN
THURSDAY AS THE SURFACE PRESSURE GRADIENT INTENSIFIES SOUTH OF THE
ELONGATED LOW PRESSURE AREA FROM THE SAULT TO GREEN BAY.

AS LOW PRESSURE LOCATES NEAR MILWAUKEE THURSDAY EVENING AND THEN
MOVES NORTHEAST TO THE STRAITS OF MACKINAC BY DAYBREAK FRIDAY... A
POWERFUL COLD FRONT WILL SURGE EAST ACROSS THE LAKE WITH WINDS
INCREASING RAPIDLY BEHIND THE FRONT DURING THE PREDAWN HOURS
FRIDAY. WINDS WILL RAPIDLY REACH GALE FORCE TO 45 KTS FRIDAY WITH
A DIMINISHING TREND BEGINNING AFTER DARK FRIDAY EVENING. SURFACE
HIGH PRESSURE WILL BUILD INTO THE AREA SATURDAY BRINGING A PERIOD
OF LIGHT WINDS LASTING ONLY UNTIL DAYBREAK SUNDAY WHEN SOUTHERLY
FLOW WILL AGAIN INCREASE AHEAD OF AN APPROACHING FRONTAL BOUNDARY.

ED F

&&

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

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

LM...GALE WATCH...LMZ080-LMZ261-LMZ362-LMZ364-LMZ366-LMZ563-LMZ565-
     LMZ567-LMZ669-LMZ671-LMZ673-LMZ675-LMZ777-LMZ779-LMZ868-
     LMZ870-LMZ872-LMZ874-LMZ876-LMZ878...7 AM FRIDAY TO 4 AM
     SATURDAY.

     GALE WARNING...LMZ740-LMZ741-LMZ742...7 AM THURSDAY TO 7 PM
     THURSDAY.

     GALE WARNING...LMZ743-LMZ744-LMZ745...7 AM THURSDAY TO 10 PM
     THURSDAY.

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
430 PM CDT WED APR 17 2013

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
182130-
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-
430 PM CDT WED APR 17 2013 /530 PM EDT WED APR 17 2013/

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

.DAY ONE...TONIGHT.

  WEATHER HAZARDS EXPECTED:

  THUNDERSTORMS...A FEW MAY PRODUCE:
  HAIL TO ONE INCH.
  STRONG DAMAGING WIND GUSTS IN EXCESS OF 60 MPH.
  HEAVY RAINFALL PRODUCING LOCALIZED FLOODING.
  ISOLATED TORNADOES.

  AREAS AFFECTED AND TIMING:

  THUNDERSTORMS WERE OCCURRING ACROSS MUCH OF THE OUTLOOK AREA
  THIS AFTERNOON...AND WILL CONTINUE TO AFFECT MUCH OF THE
  OUTLOOK AREA THROUGH THE REMAINDER OF THE AFTERNOON AND EARLY
  EVENING HOURS. THE STRONGEST STORMS CAPABLE OF PRODUCING
  DAMAGING WIND GUSTS...HAIL AND POSSIBLY ISOLATED TORNADOES
  WILL MAINLY AFFECT AREAS SOUTHEAST OF THE INTERSTATE 55 CORRIDOR
  ACROSS EAST CENTRAL ILLINOIS AND PARTS OF NORTHWEST INDIANA.
  ADDITIONAL ROUNDS OF THUNDERSTORMS AND LOCALLY HEAVY RAINFALL
  CAN BE EXPECTED THROUGH THE EVENING AND EARLY OVERNIGHT HOURS.

  DISCUSSION:

  A WAVE OF LOW PRESSURE WAS OVER WESTERN MISSOURI THIS AFTERNOON
  WITH A WARM FRONT EXTENDING EAST ACROSS CENTRAL ILLINOIS AND
  CENTRAL INDIANA. THIS WARM FRONT WILL CONTINUE TO LIFT NORTH
  ACROSS SOUTHERN PARTS OF THE OUTLOOK AREA INTO THIS EVENING
  AS THE LOW DEEPENS TO OUR WEST. THE FRONT WILL EVENTUALLY LIFT
  NORTH OF THE OUTLOOK AREA...ALONG THE ILLINOIS AND WISCONSIN
  BORDER THURSDAY MORNING. A SERIES OF UPPER LEVEL DISTURBANCES
  WILL RIPPLE NORTHEAST ACROSS THE AREA THROUGH THE NIGHT...
  MAINTAINING THE THREAT OF HEAVY RAIN AND ELEVATED HAIL
  PRODUCING STORMS WELL NORTH OF THE SURFACE WARM FRONT.
  SEVERE THUNDERSTORMS ARE MOST LIKELY LATE THIS AFTERNOON INTO
  EARLY THIS EVENING ACROSS THE SOUTHERN PORTIONS OF THE OUTLOOK
  AREA WHERE MORE NEAR SURFACE INSTABILITY WILL BE PRESENT CLOSER
  TO THE APPROACHING SURFACE WARM FRONT. ANY OF THESE STORMS WILL
  BE CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL...WITH REPEATED
  TRAINING OF HEAVY RAIN PRODUCING STORMS LEADING TO AREAS OF
  FLOODING.

PORTIONS OF MANY AREA RIVERS AND STREAMS WILL REMAIN NEAR OR
ABOVE FLOOD STAGE DUE TO RECENT RAINFALL.

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

THERE IS A SIGNIFICANT POTENTIAL FOR SEVERE WEATHER ACROSS THE
OUTLOOK AREA THURSDAY AND THURSDAY EVENING...PARTICULARLY ACROSS
AREAS ROUGHLY ALONG AND EAST OF THE INTERSTATE 55 CORRIDOR WHERE
THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS. THE GREATEST
THREATS ARE EXPECTED TO BE DAMAGING THUNDERSTORM WINDS IN EXCESS
OF 60 MPH AND HAIL LARGER THAN 1 INCH IN DIAMETER...THOUGH THE
POTENTIAL FOR ISOLATED TORNADOES WILL ALSO EXIST ESPECIALLY
ACROSS THE MODERATE RISK AREA.

SEVERAL ROUNDS OF HEAVY RAIN PRODUCING THUNDERSTORMS WILL ALSO
CONTINUE TO PRODUCE A SIGNIFICANT FLOODING THREAT...WITH MANY
AREA RIVERS ALREADY AT OR ABOVE FLOOD STAGE. LOCALLY HEAVY
RAINFALL WILL ALSO LIKELY CONTINUE TO RESULT IN FLOODING OF LOW
LYING URBAN AREAS.

PORTIONS OF MANY AREA RIVERS AND STREAMS WILL REMAIN NEAR OR
ABOVE FLOOD STAGE FOR MANY DAYS DUE TO RECENT RAINFALL.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE NEEDED THIS AFTERNOON AND THIS EVENING IN CURRENT
SEVERE WEATHER WATCH AREAS. REPORTS OF FLOODING...RAINFALL
MEASUREMENTS AND HAIL ARE WELCOME.

&&

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

LMZ740>745-182130-
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-
430 PM CDT WED APR 17 2013

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

.DAY ONE...TONIGHT.

PERIODIC THUNDERSTORMS ARE LIKELY TONIGHT. A FEW THUNDERSTORMS
COULD PRODUCE STRONG...GUSTY WINDS.

GALE FORCE WINDS ARE LIKELY TOWARD MORNING.

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

PERIODIC THUNDERSTORMS ARE LIKELY THURSDAY INTO THURSDAY EVENING.
SOME STORMS MAY BE SEVERE WITH STRONG GUSTY WINDS AND LARGE HAIL.

GALE FORCE WINDS ARE LIKELY THURSDAY INTO THURSDAY EVENING...AND
AGAIN DURING THE DAY FRIDAY. HIGH WAVES WILL LIKELY CONTINUE TO
PRODUCE HAZARDOUS CONDITIONS FOR SMALL CRAFT THROUGH FRIDAY NIGHT
PARTICULARLY ALONG THE INDIANA SHORE.

&&

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-
870-872-874-876-878-182130-
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-
430 PM CDT WED APR 17 2013

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

.DAY ONE...TONIGHT.

PERIODIC THUNDERSTORMS ARE LIKELY TONIGHT ACROSS THE SOUTHERN
HALF OF LAKE MICHIGAN. A FEW THUNDERSTORMS MAY PRODUCE STRONG
GUSTY WINDS. A FEW GALE FORCE GUSTS MAY OCCUR THIS EVENING
THROUGH TONIGHT MAINLY FOR THE SOUTHERN TIP OF LAKE MICHIGAN.

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

THUNDERSTORMS ARE LIKELY ACROSS MUCH OF LAKE MICHIGAN THROUGH
THURSDAY. SOME STORMS COULD BE SEVERE WITH GUSTY WINDS AND HAIL
ESPECIALLY ACROSS THE SOUTHERN PART OF THE LAKE.

GALE FORCE WINDS ARE LIKELY FROM LATE THURSDAY NIGHT INTO
FRIDAY NIGHT.

&&

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

RATZER

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
350 PM CDT WED APR 17 2013

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

0245 PM     FLOOD            WILMINGTON              41.30N 88.16W
04/17/2013                   WILL               IL   EMERGENCY MNGR

            2 TO 3 INCHES OF STANDING WATER ON NORTHBOUND LANES OF
            ROUTE 53 BETWEEN WILMINGTON AND ELWOOD.

&&

BN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
409 PM CDT WED APR 17 2013

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

0300 PM     HEAVY RAIN       HUNTLEY                 42.17N 88.42W
04/17/2013  M2.02 INCH       MCHENRY            IL   TRAINED SPOTTER

            STORM TOTAL SO FAR SINCE THIS MORNINGS READING. MINOR
            FLOODING ON AREA ROADS.

&&

BN

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
420 PM CDT WED APR 17 2013

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

0723 AM     HAIL             SYCAMORE                41.98N 88.70W
04/17/2013  E0.25 INCH       DEKALB             IL   TRAINED SPOTTER

0747 AM     HAIL             AMBOY                   41.72N 89.33W
04/17/2013  M0.25 INCH       LEE                IL   TRAINED SPOTTER

0846 AM     HAIL             PAW PAW                 41.69N 88.98W
04/17/2013  M0.88 INCH       LEE                IL   TRAINED SPOTTER

0920 AM     HAIL             OSWEGO                  41.70N 88.33W
04/17/2013  M0.75 INCH       KENDALL            IL   TRAINED SPOTTER

0944 AM     HAIL             6 N BOLINGBROOK         41.78N 88.07W
04/17/2013  E0.25 INCH       DUPAGE             IL   COCORAHS

0947 AM     HAIL             DOWNERS GROVE           41.80N 88.02W
04/17/2013  E0.75 INCH       DUPAGE             IL   TRAINED SPOTTER

            NEAR 88 AND HIGHLAND

0953 AM     HAIL             OAK BROOK               41.84N 87.95W
04/17/2013  M0.25 INCH       DUPAGE             IL   CO-OP OBSERVER

0957 AM     HAIL             LOMBARD                 41.87N 88.01W
04/17/2013  E0.25 INCH       DUPAGE             IL   NWS EMPLOYEE

            REPORTED ON I-88 BETWEEN I-294 AND I-355

1001 AM     HAIL             BELLWOOD                41.88N 87.88W
04/17/2013  E0.25 INCH       COOK               IL   PUBLIC

1011 AM     HAIL             WESTMONT                41.80N 87.97W
04/17/2013  M0.25 INCH       DUPAGE             IL   EMERGENCY MNGR

1030 AM     HAIL             WALTON                  41.72N 89.44W
04/17/2013  E0.25 INCH       LEE                IL   PUBLIC

1054 AM     HAIL             SSE CAROL STREAM        41.91N 88.13W
04/17/2013  E0.25 INCH       DUPAGE             IL   COCORAHS

1110 AM     HAIL             DE KALB                 41.93N 88.75W
04/17/2013  E0.88 INCH       DEKALB             IL   TRAINED SPOTTER

1114 AM     HAIL             DE KALB                 41.93N 88.75W
04/17/2013  M0.88 INCH       DEKALB             IL   TRAINED SPOTTER

1119 AM     HAIL             SCHAUMBURG              42.03N 88.08W
04/17/2013  E0.75 INCH       COOK               IL   TRAINED SPOTTER

            DIME TO PENNY SIZE

1120 AM     HAIL             4 WSW GILBERTS          42.08N 88.43W
04/17/2013  E0.25 INCH       KANE               IL   COCORAHS

1120 AM     HAIL             2 W MAPLE PARK          41.91N 88.63W
04/17/2013  E0.88 INCH       DE KALB            IL   TRAINED SPOTTER

            NICKEL SIZED HAIL COVERING THE GROUND.

1123 AM     HAIL             3 NNE HAMPSHIRE         42.14N 88.51W
04/17/2013  E0.88 INCH       KANE               IL   AMATEUR RADIO

            NEAR I-90 AND ROUTE 20.

1126 AM     HAIL             1 SSE CARPENTERSVILLE   42.11N 88.26W
04/17/2013  E0.88 INCH       KANE               IL   TRAINED SPOTTER

1132 AM     HAIL             INVERNESS               42.12N 88.10W
04/17/2013  E0.25 INCH       COOK               IL   TRAINED SPOTTER

1137 AM     HAIL             ELGIN                   42.04N 88.29W
04/17/2013  E0.75 INCH       KANE               IL   TRAINED SPOTTER

1148 AM     HAIL             NNW WALTON              41.72N 89.44W
04/17/2013  E0.88 INCH       LEE                IL   PUBLIC

            NICKEL SIZED HAIL COVERING THE GROUND.

1153 AM     HEAVY RAIN       2 SE ALGONQUIN          42.14N 88.28W
04/17/2013  U0.00 INCH       KANE               IL   911 CALL CENTER

            WATER RUSHING OVER THE ROAD AT SANDBLOOM RD AND BOLZ RD.

1153 AM     HEAVY RAIN       4 SW PINGREE GROVE      42.02N 88.46W
04/17/2013  U0.00 INCH       KANE               IL   911 CALL CENTER

            INTERSECTION OF ROUTE 47 AND PLATO ROAD IS COMPLETELY
            FLOODED.

1155 AM     HAIL             SCHAUMBURG              42.03N 88.08W
04/17/2013  E0.25 INCH       COOK               IL   TRAINED SPOTTER

1200 PM     HAIL             INVERNESS               42.12N 88.10W
04/17/2013  E0.50 INCH       COOK               IL   TRAINED SPOTTER

1205 PM     HAIL             ARLINGTON HEIGHTS       42.09N 87.98W
04/17/2013  E0.50 INCH       COOK               IL   TRAINED SPOTTER

1210 PM     HEAVY RAIN       5 SSW ALGONQUIN         42.10N 88.34W
04/17/2013  U0.00 INCH       KANE               IL   911 CALL CENTER

            STANDING WATER IN THE ROADWAY AT ROUTE 72 AND RANDALL
            ROAD.

1214 PM     HAIL             NORTH BARRINGTON        42.21N 88.13W
04/17/2013  E1.00 INCH       LAKE               IL   TRAINED SPOTTER

            TIME ESTIMATED BASED ON RADAR DATA.

1230 PM     HAIL             CARY                    42.21N 88.25W
04/17/2013  E0.25 INCH       MCHENRY            IL   TRAINED SPOTTER

            HAIL COVERING GROUND. RAIN 0.65 IN PAST HOUR.

1242 PM     HAIL             4 NE GURNEE             42.43N 87.88W
04/17/2013  E0.25 INCH       LAKE               IL   COCORAHS

1245 PM     HAIL             WAUKEGAN                42.37N 87.87W
04/17/2013  E0.88 INCH       LAKE               IL   TRAINED SPOTTER

            SOME ROOF DAMAGE, SEVERE DOWNPOUR WITH HEAVY DOWNPOUR OF
            HAIL COATING GROUND. SOME POWER LOSS IN NEIGHORHOOD.

1245 PM     HAIL             WAUKEGAN                42.37N 87.87W
04/17/2013  E0.88 INCH       LAKE               IL   TRAINED SPOTTER

            SOME ROOF DAMAGE, HEAVY DOWNPOUR WITH HAIL COATING THE
            GROUND. SOME POWER LOSS IN NEIGHBORHOOD. WINDS 40 MPH.

1252 PM     TSTM WND GST     NEW MILLFORD            42.17N 89.07W
04/17/2013  E50.00 MPH       WINNEBAGO          IL   TRAINED SPOTTER

            WINDS ESTIMATED AT 45-50 MPH JUST SOUTH OF NEW MILFORD.

1253 PM     HAIL             ZION                    42.46N 87.84W
04/17/2013  E0.25 INCH       LAKE               IL   PUBLIC

0110 PM     HAIL             SPRING GROVE            42.44N 88.24W
04/17/2013  E0.50 INCH       MCHENRY            IL   TRAINED SPOTTER

            UP TO HALF INCH IN DIAMETER HAIL.

0112 PM     HAIL             CRYSTAL LAKE            42.23N 88.33W
04/17/2013  E1.00 INCH       MCHENRY            IL   TRAINED SPOTTER

0122 PM     HAIL             POPLAR GROVE            42.37N 88.82W
04/17/2013  E0.25 INCH       BOONE              IL   TRAINED SPOTTER

            SOUTHEAST OF 173 AND HIGHWAY 76

0125 PM     HAIL             5 S ROCKFORD AIRPORT    42.13N 89.10W
04/17/2013  E0.25 INCH       OGLE               IL   PUBLIC

            NEAR ROSWELL ROAD

0130 PM     HEAVY RAIN       2 SSW ALGONQUIN         42.14N 88.32W
04/17/2013  M0.93 INCH       KANE               IL   MESONET

            SINCE MIDNIGHT

0130 PM     HEAVY RAIN       NNE ISLAND LAKE         42.28N 88.20W
04/17/2013  M0.83 INCH       MCHENRY            IL   MESONET

            SINCE MIDNIGHT

0135 PM     HAIL             ROCKFORD                42.27N 89.06W
04/17/2013  E0.25 INCH       WINNEBAGO          IL   TRAINED SPOTTER

            AND SOUTHEAST OF ROCKFORD PEA SIZE HAIL ALONG WITH
            PONDING OF WATER.

0139 PM     HEAVY RAIN       ROCKFORD AIRPORT        42.20N 89.10W
04/17/2013  M1.58 INCH       WINNEBAGO          IL   OFFICIAL NWS OBS

            SINCE MIDNIGHT

0140 PM     HEAVY RAIN       ROCKFORD                42.27N 89.06W
04/17/2013  E1.50 INCH       WINNEBAGO          IL   TRAINED SPOTTER

            NEAR I90 AND BUSINESS 20.

0140 PM     FLASH FLOOD      ROCKFORD                42.27N 89.06W
04/17/2013                   WINNEBAGO          IL   TRAINED SPOTTER

            ON SOUTH ALPINE ROAD, CAR STALLED IN WATER ESTIMATED AT 8
            INCHES DEEP.

0144 PM     HAIL             SE ROCKFORD             42.27N 89.06W
04/17/2013  E0.25 INCH       WINNEBAGO          IL   PUBLIC

            HAIL COVERING THE GROUND NEAR HARRISON AND MILFORD IN
            SOUTHEAST ROCKFORD. REPORT RELAYED BY WREX.

0150 PM     HAIL             ZION                    42.46N 87.84W
04/17/2013  E0.25 INCH       LAKE               IL   PUBLIC

            NEAR 16TH STREET.

0151 PM     HEAVY RAIN       3 NW DIXON              41.87N 89.52W
04/17/2013  M2.12 INCH       LEE                IL   MESONET

0200 PM     HEAVY RAIN       2 SW DIXON              41.83N 89.51W
04/17/2013  M2.17 INCH       LEE                IL   COCORAHS

            7 HOUR RAINFALL FROM 7 AM TO 2 PM. 1/4 INCH HAIL FELL AT
            105 PM WHICH COVERED THE GROUND BUT HAS SINCE MELTED.

0200 PM     HEAVY RAIN       3 NE GURNEE             42.41N 87.89W
04/17/2013  M0.85 INCH       LAKE               IL   COCORAHS

            RAINFALL IN 90 MINUTES STILL RAINING - HEAVY AT TIMES.
            EARLIER HAD HAIL RANGING IN SIZE FROM RICE TO MARBLE
            SIZE.

0200 PM     HEAVY RAIN       OREGON                  42.01N 89.34W
04/17/2013  E2.00 INCH       OGLE               IL   CO-OP OBSERVER

            RAIN HAS FILLED RAIN GAGE AND SPILLED INTO THE OUTER
            TUBE...EXACT AMOUNT IS NOT KNOWN BUT IT IS OVER 2 INCHES
            WHEN IT SPILLS INTO THE BIG TUBE

0218 PM     FLOOD            OREGON                  42.01N 89.34W
04/17/2013                   OGLE               IL   EMERGENCY MNGR

            FLOODING AT NURSING HOME IN OREGON. SANDBAGS BEING SENT
            TO STILLMAN VALLEY IN CASE NEEDED. LOTS OF STANDING WATER
            COUNTY WIDE.

0220 PM     HEAVY RAIN       ROCKFORD                42.27N 89.06W
04/17/2013  M2.20 INCH       WINNEBAGO          IL   TRAINED SPOTTER

            ALSO PEA SIZED HAIL COVERING THE GROUND

0220 PM     HEAVY RAIN       OREGON                  42.01N 89.34W
04/17/2013  M2.37 INCH       OGLE               IL   TRAINED SPOTTER

            SINCE 830 AM

0235 PM     HEAVY RAIN       1 WSW POPLAR GROVE      42.36N 88.84W
04/17/2013  M1.31 INCH       BOONE              IL   COCORAHS

            RAINFALL IN LAST 7 HOURS.

0245 PM     FLOOD            WILMINGTON              41.30N 88.16W
04/17/2013                   WILL               IL   EMERGENCY MNGR

            2 TO 3 INCHES OF STANDING WATER ON NORTHBOUND LANES OF
            ROUTE 53 BETWEEN WILMINGTON AND ELWOOD.

0300 PM     HEAVY RAIN       POLO                    41.98N 89.58W
04/17/2013  E1.99 INCH       OGLE               IL   CO-OP OBSERVER

0300 PM     HEAVY RAIN       HUNTLEY                 42.17N 88.42W
04/17/2013  M2.02 INCH       MCHENRY            IL   TRAINED SPOTTER

            STORM TOTAL SO FAR SINCE THIS MORNINGS READING. MINOR
            FLOODING ON AREA ROADS.

&&

BN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
440 PM CDT WED APR 17 2013

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

0350 PM     HEAVY RAIN       WNW PARK RIDGE          42.01N 87.84W
04/17/2013  M0.88 INCH       COOK               IL   COCORAHS

            0.88 INCHES SINCE 7 AM. 0.55 INCHES IN 25 MINUTES.

&&

RATZER

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
441 PM CDT WED APR 17 2013

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

0415 PM     HAIL             1 E LINCOLNWOOD         42.01N 87.71W
04/17/2013  M0.25 INCH       COOK               IL   COCORAHS

            1/4 INCH HAIL. LARGEST 0.38 INCH.

&&

RATZER

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
444 PM CDT WED APR 17 2013

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

0420 PM     HEAVY RAIN       2 NNW BURNHAM           41.66N 87.55W
04/17/2013  M0.89 INCH       COOK               IL   COCORAHS

            RAINFALL DURING PAST 25 MINUTES.

&&

RATZER