Severe Thunderstorm Warning 49, NWS Chicago, IL

395 
WUUS53 KLOT 210113 CCA
SVRLOT
ILC031-043-197-INC089-210215-
/O.COR.KLOT.SV.W.0049.140521T0110Z-140521T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTED
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
810 PM CDT TUE MAY 20 2014

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  COOK COUNTY IN NORTHEAST ILLINOIS...
  EXTREME EASTERN DUPAGE COUNTY IN NORTHEAST ILLINOIS...
  NORTHERN WILL COUNTY IN NORTHEAST ILLINOIS...
  EXTREME NORTHWESTERN LAKE COUNTY IN NORTHWEST INDIANA...

* UNTIL 915 PM CDT

* AT 806 PM CDT...A LARGE AND POWERFUL SEVERE THUNDERSTORM          
  EXTENDED FROM VILLA PARK TO DARIEN TO PLAINFIELD. THIS STORM       
  WAS MOVING EAST SOUTHEAST AT 35 MPH.

  HAZARD...GOLF BALL SIZE HAIL AND 70 MPH WIND GUSTS.

  SOURCE...RADAR INDICATED.

  IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT HAIL
           DAMAGE TO ROOFS...SIDING...WINDOWS AND VEHICLES. EXPECT
           CONSIDERABLE TREE DAMAGE. WIND DAMAGE IS ALSO LIKELY TO
           MOBILE HOMES...ROOFS AND OUTBUILDINGS.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  BELLWOOD AND MAYWOOD AROUND 815 PM CDT.
  FOREST PARK AND OAK PARK AROUND 820 PM CDT.
  LOGAN SQUARE AND BEDFORD PARK AROUND 825 PM CDT.
  DOUGLAS PARK AND HUMBOLDT PARK AROUND 830 PM CDT.
  NORTHERLY ISLAND AND CHICAGO AROUND 835 PM CDT.
  FRANKFORT AND TINLEY PARK AROUND 840 PM CDT.

  THIS INCLUDES THE SOUTHSIDE OF THE CITY OF CHICAGO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE
WEATHER INCLUDING EXTREMELY LARGE HAIL AND DESTRUCTIVE STRAIGHT LINE
WINDS. MOVE QUICKLY TO A SAFE SHELTER...SUCH AS IN AN INTERIOR 
ROOM...A BATHROOM OR CLOSET...OR BASEMENT.

&&

LAT...LON 4142 8765 4159 8813 4164 8803 4168 8802
      4170 8797 4193 8794 4193 8807 4205 8806
      4205 8767 4191 8762 4190 8760 4184 8760
      4177 8756 4175 8753 4170 8751 4168 8745
      4169 8742 4165 8743 4164 8739
TIME...MOT...LOC 0109Z 285DEG 31KT 4188 8794 4172 8796
          4166 8815

HAIL...1.75IN
WIND...70MPH

$$

IZZI

577 
WWUS53 KLOT 210128
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
828 PM CDT TUE MAY 20 2014

ILC031-043-197-INC089-210215-
/O.CON.KLOT.SV.W.0049.000000T0000Z-140521T0215Z/
WILL IL-DUPAGE IL-COOK IL-LAKE IN-
828 PM CDT TUE MAY 20 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EXTREME 
NORTHWESTERN LAKE...SOUTHERN COOK...EXTREME EASTERN DUPAGE AND 
NORTHERN WILL COUNTIES UNTIL 915 PM CDT...

AT 826 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM CICERO TO WORTH TO HOMER GLEN...AND MOVING EAST AT 35
MPH.

HAZARD...GOLF BALL SIZE HAIL AND 70 MPH WIND GUSTS.

SOURCE...TRAINED WEATHER SPOTTERS.

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT HAIL
         DAMAGE TO ROOFS...SIDING...WINDOWS AND VEHICLES. EXPECT
         CONSIDERABLE TREE DAMAGE. WIND DAMAGE IS ALSO LIKELY TO
         MOBILE HOMES...ROOFS AND OUTBUILDINGS.

SEVERE THUNDERSTORMS WILL BE NEAR...
  ORLAND PARK AND MOKENA AROUND 835 PM CDT.
  TINLEY PARK AND POSEN AROUND 840 PM CDT.
  PHOENIX AND MARKHAM AROUND 845 PM CDT.
  SOUTH HOLLAND AND RICHTON PARK AROUND 850 PM CDT.
  UNIVERSITY PARK AND THORNTON AROUND 855 PM CDT.
  STEGER AND LANSING AROUND 900 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE ROBBINS...ORLAND HILLS...
CALUMET PARK...RIVERDALE...FRANKFORT SQUARE...SOUTH CHICAGO...EAST
HAZEL CREST AND SOUTH CHICAGO HEIGHTS.

  THIS INCLUDES THE CITY OF CHICAGO.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND
LIGHTNING. SEEK SHELTER INSIDE A WELL-BUILT STRUCTURE. STAY AWAY FROM
WINDOWS.

PREPARE IMMEDIATELY FOR LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE
SHOULD MOVE TO A SHELTER...INSIDE A STRONG BUILDING AND AWAY FROM
WINDOWS.

THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE
WEATHER...INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE
WINDS AND TORNADOES. MOVE QUICKLY TO A SAFE SHELTER...SUCH AS IN AN
INTERIOR ROOM...A BATHROOM OR CLOSET...OR BASEMENT.

&&

LAT...LON 4142 8765 4159 8813 4164 8803 4168 8802
      4170 8797 4190 8794 4184 8760 4177 8756
      4175 8753 4170 8751 4168 8745 4169 8742
      4165 8743 4164 8739
TIME...MOT...LOC 0127Z 285DEG 31KT 4184 8774 4168 8776
          4162 8795

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...70MPH

$$

BIRK

661 
WWUS53 KLOT 210146
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
846 PM CDT TUE MAY 20 2014

ILC043-210155-
/O.CAN.KLOT.SV.W.0049.000000T0000Z-140521T0215Z/
DUPAGE IL-
846 PM CDT TUE MAY 20 2014


...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DUPAGE COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4142 8765 4153 8797 4164 8796 4186 8785
      4184 8760 4177 8756 4175 8753 4170 8751
      4168 8745 4169 8742 4165 8743 4164 8739
TIME...MOT...LOC 0145Z 298DEG 27KT 4174 8763 4158 8765
          4152 8784


$$

ILC031-197-INC089-210215-
/O.CON.KLOT.SV.W.0049.000000T0000Z-140521T0215Z/
WILL IL-COOK IL-LAKE IN-
846 PM CDT TUE MAY 20 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EXTREME 
NORTHWESTERN LAKE...SOUTHERN COOK AND PORTION OF NORTHERN WILL 
COUNTIES UNTIL 915 PM CDT...

AT 841 PM CDT...A LARGE SEVERE THUNDERSTORM WAS LOCATED FROM  
ENGLEWOOD TO MARKHAM TO MOKENA...AND WAS MOVING SOUTHEAST AT 30 MPH.

HAZARD...GOLF BALL SIZE HAIL AND 70 MPH WIND GUSTS.

SOURCE...TRAINED WEATHER SPOTTERS.

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT HAIL
         DAMAGE TO ROOFS...SIDING...WINDOWS AND VEHICLES. EXPECT
         CONSIDERABLE TREE DAMAGE. WIND DAMAGE IS ALSO LIKELY TO
         MOBILE HOMES...ROOFS AND OUTBUILDINGS.

SEVERE THUNDERSTORMS WILL BE NEAR...
  THORNTON AND SOUTH HOLLAND AROUND 850 PM CDT.
  RICHTON PARK AND OLYMPIA FIELDS AROUND 855 PM CDT.
  UNIVERSITY PARK AND PARK FOREST AROUND 900 PM CDT.
  STEGER AND CRETE AROUND 905 PM CDT.

THIS WARNING INCLUDES THE SOUTH SIDE OF CHICAGO. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE
WEATHER...INCLUDING EXTREMELY LARGE HAIL AND DESTRUCTIVE STRAIGHT 
LINE WINDS. MOVE QUICKLY TO A SAFE SHELTER...SUCH AS IN AN INTERIOR 
ROOM...A BATHROOM OR CLOSET...OR BASEMENT.

&&

LAT...LON 4142 8765 4153 8797 4164 8796 4186 8785
      4184 8760 4177 8756 4175 8753 4170 8751
      4168 8745 4169 8742 4165 8743 4164 8739
TIME...MOT...LOC 0145Z 298DEG 27KT 4174 8763 4158 8765
          4152 8784


TORNADO...POSSIBLE
HAIL...1.75IN
WIND...70MPH

$$

IZZI

619 
WWUS53 KLOT 210202
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
902 PM CDT TUE MAY 20 2014

ILC031-197-INC089-210215-
/O.CON.KLOT.SV.W.0049.000000T0000Z-140521T0215Z/
WILL IL-COOK IL-LAKE IN-
902 PM CDT TUE MAY 20 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EXTREME 
NORTHWESTERN LAKE...SOUTHERN COOK AND PORTIONS OF NORTHERN WILL 
COUNTIES UNTIL 915 PM CDT...

AT 856 PM CDT...A LARGE AND POWERFUL SEVERE THUNDERSTORM WAS LOCATED 
FROM CHATHAM TO GLENWOOD TO MATTESON AND WAS MOVING SOUTHEAST AT 30 
MPH.

HAZARD...GOLF BALL SIZE HAIL AND 70 MPH WIND GUSTS.

SOURCE...TRAINED WEATHER SPOTTERS.

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT HAIL
         DAMAGE TO ROOFS...SIDING...WINDOWS AND VEHICLES. EXPECT
         CONSIDERABLE TREE DAMAGE. WIND DAMAGE IS ALSO LIKELY TO
         MOBILE HOMES...ROOFS AND OUTBUILDINGS.

SEVERE THUNDERSTORMS WILL BE NEAR...
  UNIVERSITY PARK AND STEGER AROUND 910 PM CDT.
  CRETE AROUND 915 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE SOUTH CHICAGO HEIGHTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE
WEATHER...INCLUDING EXTREMELY LARGE HAIL AND DESTRUCTIVE STRAIGHT 
LINE WINDS. MOVE QUICKLY TO A SAFE SHELTER...SUCH AS IN AN INTERIOR 
ROOM...A BATHROOM OR CLOSET...OR BASEMENT.

&&

LAT...LON 4142 8765 4153 8797 4164 8796 4186 8785
      4177 8756 4175 8753 4170 8751 4168 8745
      4169 8742 4165 8743 4164 8739
TIME...MOT...LOC 0201Z 298DEG 27KT 4169 8752 4151 8757
          4151 8774


HAIL...1.75IN
WIND...70MPH

$$

IZZI

264 
WWUS53 KLOT 210214
SVSLOT

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
914 PM CDT TUE MAY 20 2014

ILC031-197-INC089-210224-
/O.EXP.KLOT.SV.W.0049.000000T0000Z-140521T0215Z/
WILL IL-COOK IL-LAKE IN-
914 PM CDT TUE MAY 20 2014


...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LAKE...
SOUTHEASTERN COOK AND CENTRAL WILL COUNTIES HAS BEEN REISSUED...

PLEASE REFER TO THAT BULLETIN FOR THE LATEST SEVERE WEATHER
INFORMATION.

LAT...LON 4142 8765 4153 8797 4164 8796 4186 8785
      4177 8756 4175 8753 4170 8751 4168 8745
      4169 8742 4165 8743 4164 8739
TIME...MOT...LOC 0214Z 298DEG 27KT 4164 8740 4146 8746
          4146 8763


$$

IZZI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
724 PM CDT TUE MAY 20 2014

.MESOSCALE DISCUSSION...
719 PM CDT

DISCRETE SUPERCELLS CONTINUE TO BE THE FAVORED MODE OF CONVECTION
ACROSS NORTHERN ILLINOIS AS SEVERAL MOVE EASTWARD ALONG AND NORTH
OF INTERSTATE 88. STEEP LAPSE RATES AND MODERATE INSTABILITY
CONTINUE TO SUPPORT LARGE HAIL WITH PING PONG BALL TO EVEN GOLF
BALL SIZE HAIL BEING REPORTED AT TIMES. HAVE HEARD OF JUST A FEW
WIND DAMAGE REPORTS THUS FAR THOUGH SOME WEAK OUTFLOW WAS MAKING
IT TO THE GROUND OVER A LARGER AREA...HOWEVER THE DEKALB COUNTY
STORM IS BEGINNING TO SHOW BETTER LOW LEVEL ROTATION/WIND
SIGNATURE AT 713 PM CDT. THE I-88 CORRIDOR IS STILL FAVORED FOR
STRONGEST ACTIVITY AND NEW DEVELOPMENT BUT SUSPECT THAT ACTIVITY
WILL ARC SOUTHEASTWARD TOWARDS WILL AND COOK COUNTIES OVER THE
NEXT HOUR OR SO. AM SEEING SOME SLIGHT TURNING OF THE WINDS ACROSS
THE CENTRAL/SOUTHERN METRO SUGGESTING THAT ADDITIONAL DEVELOPMENT
IS POSSIBLE WITH BETTER CONVERGENCE BUT STORM SCALE
OUTFLOWS/INTERACTION MAY BE THE MORE LIKELY DRIVER OF NEW
CONVECTION. OTHERWISE CURRENT STORMS WILL REMAIN SEVERE WITH LARGE
HAIL AND WHAT APPEARS TO BE AN INCREASING DAMAGING WIND THREAT.
TORNADO THREAT IS STILL BEING MONITORED AND WOULD LIKELY BE
ISOLATED AND RELEGATED TO STORM/BOUNDARY INTERACTIONS...WITH THE
CELL OVER SOUTHERN DEKALB/WESTERN KANE THE MOST CONCERNING AT 720
PM CDT.

MDB

&&

.DISCUSSION...
318 PM CDT

MAIN FORECAST ISSUES REVOLVE AROUND SHORT TERM...IN PARTICULAR THE
INITIATION AND EVOLUTION OF POTENTIALLY SEVERE CONVECTION ACROSS THE
AREA LATE THIS AFTERNOON INTO TONIGHT. FAIRLY HIGH PROBABILITY OF
SEVERE WATCH BEING ISSUED FOR THE AREA IN THE NEXT COUPLE OF HOURS.

AT 20Z...SURFACE OBS AND VISIBLE SATELLITE INDICATED A WEAK COLD
FRONT STRETCHING FROM NEAR MILWAUKEE...TO JUST SOUTH OF DUBUQUE AND
BACK ACROSS SOUTHWEST IOWA. SATELLITE OBSERVED CUMULUS CLOUD FIELD
SUGGESTS CONVECTIVE INITIATION IS PERHAPS MOST LIKELY OVER SOUTHEAST
WISCONSIN NEAR INTERSECTION OF FRONT AND WEAK LAKE BREEZE BOUNDARY
AND ALSO BACK ALONG THE FRONT INTO EASTERN IA WHERE CU HAS DEVELOPED
MORE RAPIDLY IN LAST HOUR OR SO. 12Z SOUNDINGS FROM ACROSS THE
REGION AND UPSTREAM SITES DEPICTED VERY STEEP MID-LEVEL LAPSE RATES
AND PRESENCE OF EML...WITH RATHER DRY MOISTURE PROFILES. BATTLE
BETWEEN CAPPING EML AND MOIST CONVERGENCE ALONG AFOREMENTIONED
BOUNDARIES APPEARS POISED TO PLAY OUT ACROSS THE AREA IN THE NEXT
COUPLE OF HOURS...WITH CONVECTION-ALLOWING HIGH-RES MODEL GUIDANCE
GENERALLY IN SUPPORT OF DEVELOPING THUNDERSTORMS ALONG THE FRONT
LATE THIS AFTERNOON AND EARLY THIS EVENING...WITH STORMS EVOLVING
EAST AND SOUTHEAST ACROSS THE WFO LOT CWA. EFFECTIVE BULK SHEAR IN
THE 35-45 KT RANGE MLCAPES AROUND 2000 J/KG SHOULD SUPPORT SUPERCELL
STRUCTURES...WITH UNIDIRECTIONAL WIND PROFILES AND DRY MID-LEVEL AIR
LIKELY TO SUPPORT DAMAGING WIND THREAT...AS WELL AS LARGE HAIL
POTENTIAL WITH THE STEEP LAPSE RATES. WHILE SOUNDINGS FAIRLY DRY
ABOVE THE BOUNDARY LAYER...WIDESPREAD HEAVY RAINFALL NOT LIKELY.
HOWEVER...WEST-EAST BOUNDARY ORIENTATION (FUTURE OUTFLOW AND WEAK
FRONT) COULD SUPPORT SOME TRAINING/BACK-BUILDING OF CONVECTION WHICH
COULD POSE A LOCALLY HEAVY RAINFALL/FLOODING THREAT. CONVECTION
SHOULD SHOW A GRADUAL DIURNAL DECREASE LATE TONIGHT...THOUGH WILL
LIKELY CONTINUE AS IT EVOLVES OFF TO THE EAST/SOUTHEAST OF THE CWA
THROUGH EARLY WEDNESDAY MORNING IN ASSOCIATION WITH MID-LEVEL SHORT
WAVE APPROACHING LATER TONIGHT FROM NEBRASKA.

ON WEDNESDAY...FRONT CONTINUES TO SAG ACROSS THE SOUTHERN HALF OF
THE FORECAST AREA. FRONT AND RENEWED CONVECTIVE DEVELOPMENT WILL BE
FOCUSED IN FAR SOUTH PORTION OF CWA AS DESTABILIZATION OCCURS DURING
MIDDAY AND AFTERNOON HOURS. SHEAR/CAPE BALANCE AGAIN INDICATES
SEVERE THREAT...THOUGH MAINLY OFF TO THE SOUTH/SOUTHEAST OF THE CWA
AS STORMS MATURE IN THE AFTERNOON. ONCE FRONT CLEARS TO THE SOUTH BY
WEDNESDAY EVENING...QUIET WEATHER APPEARS IN STORE THROUGH THE END
OF THE WEEK AS HIGH PRESSURE BUILDS ACROSS THE UPPER MIDWEST.

AFTER SUMMER-LIKE MID-80S TODAY...TEMPS WILL SETTLE BACK INTO THE
70S WITH 60S ALONG THE LAKE WITH NORTH-NORTHEAST WINDS THROUGH
FRIDAY. GRADUAL WARMING INTO THE MEMORIAL DAY WEEKEND LOOKS ON TRACK
WITH DIMINISHING LAKE INFLUENCE. 80S LOOK TO RETURN SUNDAY AND
ESPECIALLY MONDAY...WITH SOME INDICATION WE COULD BE APPROACHING 90
DEGREES ESPECIALLY ACROSS OUR SOUTHEAST CWA. MAIN QUESTION IN LATER
PERIODS WILL BE RETURN OF SHRA/TSRA THREAT AS UPPER RIDGE FORMS
OVERHEAD AND EVENTUALLY SHIFTS EAST OF THE CWA. TSRA THREAT APPEARS
TO GRADUALLY INCREASE ACROSS WEST/NORTHWEST PORTIONS OF CWA LATER
SUNDAY INTO TUESDAY...THOUGH LIKELY TO BE A FEW PERIODS WITHIN
OTHERWISE MANY DRY HOURS. MOST OF MEMORIAL DAY HOLIDAY WEEKEND
SHOULD BE PRETTY DECENT FOR OUTDOOR PLANS.

RATZER

&&

.AVIATION...

//ORD AND MDW CONCERNS...UPDATED 00Z...

* THUNDERSTORMS THIS EVENING.
* POTENTIAL FOR MVFR VSBY/CIGS OVERNIGHT.

BMD

//DISCUSSION...UPDATED 00Z...

LINE OF THUNDERSTORMS HAS ALREADY FIRED FROM WESTERN IOWA EAST ALONG
THE IL/WI STATE LINE. INDIVIDUAL CELLS ARE EXPECTED TO MOVE EAST
THIS EVENING...HOWEVER THE LINE IS EXPECTED TO SLOWLY SAG SOUTHWARD
WITH ADDITIONAL DEVELOPMENT OCCURRING NEAR THE OVER THE TERMINALS
THIS EVENING. UNLESS THE LINE ACCELERATES...THERE COULD BE A 3-4
HOUR WINDOW OF TRAINING THUNDERSTORMS ACROSS THE TERMINALS. SOME OF
THE STRONGEST THUNDERSTORMS COULD PRODUCE LARGE HAIL AND DAMAGING
WINDS.

SOME MODELS/GUIDANCE POINT TO A WINDOW OF POTENTIAL MVFR CIGS
DEVELOPING OVERNIGHT...ROUGHLY 09Z TO 14Z  GIVE OR TAKE AN HOUR OR
TWO...HOWEVER CONFIDENCE REMAINS LOW ON WHETHER OR NOT THIS WILL
MATERIALIZE SO WILL MAINTAIN A SCT015 IN THE MEANTIME. MIST/FOG
REMAINS A POSSIBILITY THOUGH REDUCING VSBY TO MVFR. WINDS EXPECTED
BECOME LIGHT AND VARIABLE FOR A PERIOD EARLY WEDNESDAY
MORNING...THEN SHOULD BECOME WNW TO NW DURING THE DAY WEDNESDAY AS
THE FRONT SINKS INTO CENTRAL ILLINOIS.

BMD

//ORD AND MDW CONFIDENCE...UPDATED 00Z...

* MEDIUM HIGH-CONFIDENCE IN TSRA/TIMING.
* LOW CONFIDENCE IN MVFR CIGS OVERNIGHT.

BMD

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

THURSDAY THROUGH SUNDAY...VFR.
MONDAY...CHC TSRA.

BMD

&&

.MARINE...
216 PM CDT

LOW PRESSURE ACROSS NORTHERN MINNESOTA IS LIFTING A WARM FRONTAL
BOUNDARY NORTHWARD ACROSS THE LAKE THIS AFTERNOON. IN THE WAKE OF
THIS BOUNDARY...A WARM AND MOIST AIRMASS IS LIFTING NORTHWARD ACROSS
THE COOL LAKE WATERS. THIS WILL INCREASE THE THREAT FOR FOG ACROSS
THE LAKE TONIGHT. OTHERWISE...THE MAIN THREAT TONIGHT...MAINLY
ACROSS THE SOUTHERN PORTION OF THE LAKE WILL BE STRONG TO SEVERE
THUNDERSTORMS. THE ATMOSPHERE WILL BE SUPPORTIVE OF STORMS CAPABLE
OF PRODUCING WINDS IN EXCESS OF 50 KT AND LARGE HAIL. THE MAIN
THREAT LOOKS TO BE THIS EVENING.

HIGH PRESSURE WILL GRADUALLY BUILD SOUTHEASTWARD OVER THE LAKE BY
FRIDAY. A PERIOD OF NORTHERLY WINDS ARE LIKELY PRIOR TO THE ARRIVAL
OF THE SURFACE HIGH. HOWEVER...WINDS ARE EXPECTED TO SHIFT BACK OUT
OF THE SOUTH AND WILL LIKELY INCREASE SOME LATER IN THE WEEKEND INTO
EARLY NEXT WEEK AS THE SURFACE HIGH SHIFTS EASTWARD ACROSS THE OHIO
VALLEY.

KJB

&&

.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/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGO

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
549 PM CDT TUE MAY 20 2014

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
212300-
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-
549 PM CDT TUE MAY 20 2014 /649 PM EDT TUE MAY 20 2014/

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

.DAY ONE...TONIGHT.

  WEATHER HAZARDS EXPECTED:

  THUNDERSTORMS...SOME OF WHICH MAY BE SEVERE WITH:
  HAIL TO THE SIZE OF GOLF BALLS.
  DAMAGING WINDS.
  ISOLATED FLASH FLOODING.
  AN OUTSIDE CHANCE OF A TORNADO.

  AREAS AFFECTED AND TIMING:

  SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP BY EARLY THIS
  EVENING ACROSS FAR NORTHERN ILLINOIS AND EXPAND IN COVERAGE
  THROUGH THE EVENING ACROSS MUCH OF NORTH CENTRAL AND NORTHEAST
  ILLINOIS...AND INTO NORTHWEST INDIANA. STORMS WILL SLOWLY
  DIMINISH IN COVERAGE AND INTENSITY OVERNIGHT. THE SEVERE
  WEATHER THREAT LOOKS TO BE AT ITS PEAK ALONG...AND NORTH OF
  INTERSTATE 80...AND MAINLY BETWEEN 6 PM AND 1 AM.

  DISCUSSION:

  A WEAK COLD FRONT WILL MOVE SLOWLY SOUTHEAST INTO THE AREA THIS
  EVENING. SCATTERED THUNDERSTORMS WILL LIKELY DEVELOP ALONG OR
  JUST AHEAD OF THE FRONT ACROSS FAR NORTHERN ILLINOIS LATE THIS
  AFTERNOON. THESE INITIAL STORMS WILL BE CAPABLE OF LARGE HAIL
  AND STRONG WINDS...ALONG WITH AN OUTSIDE CHANCE OF A TORNADO.
  AS WINDS ALOFT INCREASE THIS EVENING STORMS WILL LIKELY ORGANIZE
  AND HAVE THE GREATEST POTENTIAL OF PRODUCING STRONG WINDS AS
  THEY EVOLVE SOUTHEAST ACROSS THE REGION...INCLUDING ACROSS THE
  CHICAGO METRO AREA. THE STORMS WILL MAINTAIN A HAIL THREAT AS
  WELL AS AN ISOLATED FLASH FLOOD THREAT...AS IT IS POSSIBLE FOR A
  SEVERAL HOUR PERIOD OF STORMS IN SOME COMMUNITIES. STORMS SHOULD
  SLOWLY DIMINISH IN INTENSITY OVERNIGHT...WITH A SLOW PROGRESSION
  SOUTHWARD.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THERE IS A CHANCE OF THUNDERSTORMS SOUTH OF INTERSTATE 80 ON
WEDNESDAY. SOME OF THESE STORMS COULD AGAIN BE STRONG TO
SEVERE...WITH LARGE HAIL AND DAMAGING WINDS THE MAIN THREATS FROM
ANY SEVERE STORMS.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS NORTH CENTRAL
ILLINOIS SUNDAY AND SUNDAY NIGHT.

THUNDERSTORMS ARE ALSO POSSIBLE NORTH OF INTERSTATE 80 ON MONDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED THROUGH
TONIGHT...ESPECIALLY IN AREAS NORTH OF INTERSTATE 80.

&&

LMZ740>745-212300-
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-
549 PM CDT TUE MAY 20 2014

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. A FEW OF THESE THUNDERSTORMS
COULD BE SEVERE...PRODUCING WINDS OVER 50 KNOTS AND LARGE HAIL.

PATCHY DENSE FOG IS POSSIBLE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THERE IS A CHANCE OF THUNDERSTORMS MONDAY.

&&

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-212300-
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-
549 PM CDT TUE MAY 20 2014

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

.DAY ONE...TONIGHT.

THERE IS A CHANCE OF THUNDERSTORMS. A FEW OF THESE STORMS COULD
BE SEVERE ACROSS THE SOUTHERN THIRD OF THE LAKE...PRODUCING WINDS
IN EXCESS OF 50 KNOTS AND LARGE HAIL.

AREAS OF DENSE FOG IS POSSIBLE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THERE IS A CHANCE OF THUNDERSTORMS SUNDAY NIGHT AND MONDAY.

&&

BEACHLER

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

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

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
741 PM CDT TUE MAY 20 2014

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

0715 PM     HAIL             NAPERVILLE              41.76N 88.15W
05/20/2014  E1.00 INCH       DUPAGE             IL   TRAINED SPOTTER

            FERRY RD AND ROUTE 59.

0735 PM     HAIL             4 N SUGAR GROVE         41.83N 88.46W
05/20/2014  E1.75 INCH       KANE               IL   TRAINED SPOTTER

            GOLF BALL SIZE.

&&

BN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
743 PM CDT TUE MAY 20 2014

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

0739 PM     HAIL             N SUGAR GROVE           41.77N 88.46W
05/20/2014  E2.00 INCH       KANE               IL   TRAINED SPOTTER

            ON ROUTE 47 ONE MILE SOUTH OF I-88.

&&

BN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
754 PM CDT TUE MAY 20 2014

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

0737 PM     HAIL             NORTH AURORA            41.80N 88.33W
05/20/2014  E1.00 INCH       KANE               IL   TRAINED SPOTTER

            BUTTERFIELD - IL-56 - AND MITCHELL RD.

0737 PM     HAIL             NAPERVILLE              41.76N 88.15W
05/20/2014  E0.88 INCH       DUPAGE             IL   TRAINED SPOTTER

            MINOR STREET FLOODING

&&

BN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
804 PM CDT TUE MAY 20 2014

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

0743 PM     HAIL             NORTH AURORA            41.80N 88.33W
05/20/2014  E1.75 INCH       KANE               IL   TRAINED SPOTTER

            GOLF BALL SIZE.

&&

BN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
808 PM CDT TUE MAY 20 2014

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

0704 PM     HAIL             1 WNW BATAVIA           41.86N 88.32W
05/20/2014  E0.75 INCH       KANE               IL   COCORAHS

&&

AKREIN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
809 PM CDT TUE MAY 20 2014

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

0701 PM     HAIL             3 W AURORA              41.77N 88.35W
05/20/2014  E0.75 INCH       KANE               IL   COCORAHS

&&

AKREIN