Severe Thunderstorm Warning 164, NWS Chicago, IL

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
408 PM CDT SAT AUG 13 2011

.DISCUSSION...

SHORT TERM...TONIGHT THROUGH SUNDAY NIGHT...
310 PM CDT

MAIN WEATHER CONCERNS ARE IN THE SHORT TERM WITH SHOWER/THUNDER
EVOLUTION INTO THE EVENING...WITH ANOTHER CHANCE FOR SHRA/TSRA AGAIN
MID WEEK. WATER VAPOR IMAGERY SHOWS A POTENT UPPER TROUGH SPINNING
INTO NORTHWEST AND WEST CENTRAL ILLINOIS THIS AFTERNOON WITH UPPER
RIDGING MOVING EASTWARD ACROSS THE U.S. AND CANADIAN ROCKIES.
ANOTHER STRONG UPPER LOW IS SPINNING OFF THE BRITISH COLUMBIA COAST.
AT THE SURFACE...A FAIRLY BROAD CLOSED LOW IS MOVING EASTWARD ACROSS
LAKE MICHIGAN INTO LOWER MICHIGAN WITH A COLD FRONTAL BOUNDARY
EXTENDING FROM THE LOW IN SOUTHEAST WISCONSIN SOUTHWARD INTO WESTERN
ILLINOIS...WITH A WEAK TROUGH EXTENDING FROM NEAR CHICAGO
SOUTHWESTWARD INTO EAST-CENTRAL ILLINOIS.SHOWERS AND THUNDERSTORMS
CONTINUE AHEAD OF THE FRONT WITH NUMEROUS SHOWERS/ISOLATED THUNDER
SPREADING SOUTHEASTWARD BEHIND THE FRONT IN CONJUNCTION WITH THE
UPPER LOW.

THIS AFTERNOON...SEVERE THREAT CONTINUES ACROSS MOST OF THE AREA AT
MID AFTERNOON. FORCING HAS BECOME LESS WITH THE COLD FRONT...OUTFLOW
BOUNDARIES...AND WHAT WAS PROBABLY A PRE-FRONTAL TROUGH ALL DRIVING
CONVECTION IN CONJUNCTION WITH THE UPPER LOW. INSTABILITY REMAINS
HIGH THOUGH DEEP SHEAR IS MARGINAL FOR PROLONGED ORGANIZATION BUT
STRONG ENOUGH TO KEEP STORMS GOING IN A LESS INTENSE STATE.
STRONGEST UPDRAFTS HAVE BEEN PRODUCING QUARTER SIZE HAIL WITH
ISOLATED GOLF BALL HAIL REPORTS AS WELL. WINDS HAVE BEEN GUSTING IN
THE 40-50 MPH RANGE. EXPECT THAT THE SEVERE THREAT WILL CONTINUE FOR
A FEW HOURS YET AS THE LOW MOVES EAST WITH WIND AND HAIL THE PRIMARY
THREATS. CANNOT COMPLETELY RULE OUT ISOLATED TORNADO THREAT WITH
GOOD 0-3 KM CAPE BUT AMBIENT LOW LEVEL SHEAR IS WEAK...HOWEVER GIVEN
THE NUMEROUS BOUNDARIES SPREAD ACROSS THE AREA LOCAL INTERACTION
COULD RESULT IN SOME LOW LEVEL ROTATION AND POTENTIALLY A TORNADO
BUT FEEL THIS THREAT IS PRETTY LOW.

TONIGHT AND SUNDAY...THE UPPER LOW WILL CONTINUE TO SPIN EASTWARD
BUT ITS FORWARD SPEED WILL SLOW AS IT BECOMES CUTOFF FROM THE MAIN
BELT OF UPPER FLOW ACROSS CENTRAL AND NORTHERN ONTARIO/QUEBEC. THIS
WILL KEEP CYCLONIC FLOW IN PLACE ACROSS THE FORECAST AREA THROUGH
TONIGHT. THE STRONG/SEVERE THUNDERSTORMS WILL MOVE OUT OF THE CWA
EARLY THIS EVENING LEAVING ACTIVITY ASSOCIATED WITH THE UPPER LOW.
INSTABILITY WILL DIMINISH WITH SUNSET SO EXPECT THAT THUNDER THREAT
WILL EXIST FOR A FEW HOURS AFTER 00Z THEN FADE BUT SHOWERS WILL
PROBABLY CONTINUE. DEEP LAYER DRY AIR WILL INCREASE FROM THE
NORTHWEST OVERNIGHT SO SUSPECT THAT FAR WESTERN AREAS OF THE CWA
TOWARDS THE INTERSTATE 39 CORRIDOR WILL SEE SHOWER ACTIVITY END
SOMETIME OVERNIGHT. AREAS EAST WILL CONTINUE TO SEE CHANCES FOR
SHOWERS THROUGH MUCH OF THE NIGHT BUT THERE WILL LIKELY BE A SLOW
DRY PUSH EASTWARD. COLD ADVECTION WILL BE IN PLACE WITH H85 TEMPS
FALLING INTO THE 10-12 C RANGE. THIS WILL PRODUCE LAKE-H85 DELTA T
OF 11-13 DEGREES. THIS WILL BE MARGINAL BUT PROBABLY SUFFICIENT FOR
THE DEVELOPMENT OF LAKE EFFECT RAIN SHOWERS LATE TONIGHT AND SUNDAY
MORNING...AND MORE THAN ENOUGH FOR LAKE EFFECT CLOUDS. WINDS WILL BE
JUST ABOUT DUE NORTH SO NORTHWEST INDIANA WILL BE THE PRIME AREA
THOUGH THERE MAY BE ENOUGH OF AN EASTERLY COMPONENT TO AFFECT
EXTREME SOUTHEAST COOK COUNTY FROM CHICAGO SOUTHWARD SUNDAY MORNING.
FORECAST SOUNDINGS SHOW THAT INVERSION HEIGHTS TUMBLE AS SLIGHTLY
WARMER AIR MOVES IN ALOFT BUT SYNOPTIC CYCLONIC FLOW WILL LAST INTO
THE AFTERNOON. WILL CONTINUE WITH CHANCE POPS FOR RAIN SHOWERS
THROUGH THE MORNING FOR THE ABOVE HOURS AND TRANSITION DOWNWARD INTO
THE AFTERNOON. THE REMAINDER OF THE AREA SHOULD SEE A FAIR AMOUNT OF
SUNSHINE AS ANTICYCLONIC FLOW TAKES OVER THANKS TO THE ARRIVAL OF
THE AFOREMENTIONED UPPER RIDGE BUILDING IN. HIGHS SHOULD REMAIN
IN THE MID 70S FOR MOST OF THE AREA WITH UPPER 70S TO AROUND 80
SOUTH OF INTERSTATE 80. SURFACE HIGH PRESSURE WILL MOVE JUST ABOUT
OVERHEAD SUNDAY NIGHT ALLOWING FOR STRONG RADIATIONAL COOLING.
THIS SHOULD SUPPORT LOWS IN THE MID TO UPPER 50S OUTSIDE OF THE
CHICAGO METRO AREA.

MDB

LONG TERM...MONDAY THROUGH SATURDAY...
343 PM CDT

A RIDGE OF HIGH PRESSURE WILL BE CENTERED OVER THE WESTERN LAKES
MONDAY AND VERY SLOWLY DRIFT EAST MONDAY NIGHT INTO TUESDAY. BOTH
DAYS LOOKING DRY WITH LOW HUMIDITY AND NEAR NORMAL TEMPS IN THE
LOWER 80S. NORTHEAST FLOW MONDAY/SOUTHEAST FLOW TUESDAY AND POSSIBLY
LAKE BREEZES WILL KEEP THE IMMEDIATE LAKESHORE AREAS A FEW DEGREES
COOLER.

BY TUESDAY NIGHT...LOW PRESSURE WILL BE MOVING EAST ACROSS SOUTHERN
CANADA WITH A TRAILING COLD FRONT BACK INTO THE PLAINS. THIS FRONT
WILL PUSH EAST INTO THE UPPER MIDWEST/WESTERN LAKES WEDNESDAY AND
THEN PUSH SOUTH ACROSS THE AREA WEDNESDAY NIGHT INTO THURSDAY
MORNING AND THIS APPEARS TO BE THE BEST CHANCE OF PRECIP...THOUGH
THE MODELS ARE STILL HINTING AT SOME POSSIBLE WARM AIR ADVECTION
PRECIP TUESDAY NIGHT INTO WEDNESDAY MORNING...WELL AHEAD OF THE COLD
FRONT. HAVE LEFT LOW POPS IN THE FORECAST DURING THIS TIME PERIOD
BUT NOT ALL THAT CONFIDENT IN COVERAGE OR DURATION OF ANY PRECIP.
HIGH TEMPERATURES ON WEDNESDAY ALSO SOMEWHAT TRICKY DEPENDING ON
PRECIP TIMING AND CLOUD COVER. HAVE KEPT TEMPS GENERALLY IN THE
LOWER 80S BUT MORE SUN AND A LATER PRECIP ARRIVAL MIGHT ALLOW TEMPS
TO WARM INTO THE MID OR PERHAPS EVEN UPPER 80S.

ANOTHER BROAD BUT WEAK AREA OF HIGH PRESSURE WILL BUILD ACROSS THE
MIDWEST THURSDAY INTO FRIDAY. WHILE 850MB TEMPS DO COOL OFF INTO THE
+12C TO +14C RANGE...FULL SUNSHINE SHOULD ALLOW TEMPS TO WARM INTO
THE UPPER 70S/LOWER 80S. THIS HIGH DRIFTS EAST FRIDAY/FRIDAY NIGHT
WITH A SLIGHT WARMING TREND INTO THE WEEKEND. CMS

&&

.AVIATION...

//ORD AND MDW CONCERNS...UPDATED 21Z...

* TSRA IN THE AREA INTO EARLY EVENING.

* MVFR CEILINGS LATE TONIGHT INTO EARLY SUNDAY MORNING.

PAW

//DISCUSSION...UPDATED 21Z

CLUSTERS OF TSRA HAVE CONTINUED TO DEVELOP NEAR AND AHEAD OF THE
MID LEVEL LOW...WITH ASSISTANCE FROM AFTERNOON HEATING. EARLY THIS
EVENING THE HEATING FROM THE SUN WILL BE LOST AND THE MOVEMENT
OF THE MID LEVEL LOW WILL PUSH WHATEVER REMAINS OF THE TSRA TO
EAST OF THE TERMINALS. EXACT TIMING IS THE QUESTION.

PREVIOUS DISCUSSION UPDATED 18Z...
MAIN AREA OF SHRA AND TSRA ARE CURRENTLY ACROSS SW WI AND NE AND
N CENTRAL IL AHEAD OF MID LEVEL LOW AND ASSOCIATED COLD FRONT
PUSHING ESE ACROSS THE REGION. ANOTHER AREA OF SHRA IS IN E IA
WITH SCATTERED TSRA IN NE IA CLOSE TO CENTER OF THE MID LEVEL LOW.

WITH ONLY SCATTERED CLOUDS ACROSS ALL BUT FAR NW IL THIS MORNING
TEMPERATURES ROSE FAIRLY QUICKLY AHEAD OF THE FRONT. THIS HEATING
OF THE AXIS OF HIGHER DEW POINTS FROM SOUTHERN LAKE MI SSW TO SW
IL RESULTED IN DESTABILIZATION WITH SB CAPE OF 2.5K J/KG AND LI
OF -8.

WHILE LOW LEVEL CONVERGENCE IS NOT IMPRESSIVE AHEAD/ALONG THE
SURFACE FRONT CONTINUED DESTABILIZATION WILL FAVOR CONTINUED
CONVECTIVE ACTIVITY TO HOLD TOGETHER WHILE NUMEROUS OUTFLOW
BOUNDARIES ACTING TO PROVIDE LOCALIZED LOW LEVEL CONVERGENCE.
EXTRAPOLATION OF CURRENT TSRA ACTIVITY HAS ARRIVAL AT KORD AROUND
1830Z WHILE TIMING AT KMDW MORE PROBLEMATIC AS ACTIVITY OVER LAST
HR HAS NOT SHOWN MUCH MOVEMENT/DEVELOPMENT SOUTHWARD. CURRENT
OUTFLOW BOUNDARY MAKING SE PROGRESS AND EXPECTED TO REACH KMDW
AROUND 19Z. BOUNDARY EXPECTED TO PROVIDE ENOUGH FORCING TO
INITIATE NEW CONVECTION IN KMDW VC.

SHRA AND TSRA IN FAR NE IA ARE UNDER/CLOSE TO THE COLD POOL AT
THE CENTER OF THE MID LEVEL LOW. WITH THIS CIRCULATION PROGGED TO
MOVE E ACROSS FAR SOUTHERN WI HAVE ADDITIONAL SHRA LATER TODAY
BUT HAVE LEFT OUT ADDITIONAL TS THOUGH WILL NEED TO BE MONITORED.

LARGE AREA OF STRATOCU...SOME DIURNAL...UNDER THE UPPER TROUGH.
RATER SIGNIFICANT AREA OF MVFR CIGS FROM NORTHERN IA AND SOUTHERN
MN E INTO SOUTHERN WI. WITH THE UPPER TROUGH TO PASS OVER THE
LOCAL AREA LATER EVENING AND OVERNIGHT WOULD EXPECT SOME OF THESE
AREAS OF MVFR CEILINGS TO BE AROUND. BY SUN MORNING CYCLONIC FLOW
STILL IN PLACE OVER THE AREA THROUGH WIDESPREAD SUBSIDENCE WILL
HAVE SET IN FOLLOWING THE UPPER TROUGH PASSAGE AND EXPECT ANY MVFR
CEILINGS TO SCATTER OUT.

TRS

//ORD AND MDW CONFIDENCE...UPDATED 21Z...

* MEDIUM CONFIDENCE IN TIMING OF TSRA ENDING THIS EVENING.

* MEDIUM CONFIDENCE IN MVFR CEILINGS NEAR OR AT THE TERMINALS LATE
  TONIGHT INTO SUNDAY MORNING.

PAW

//OUTLOOK FOR ORD/MDW FOR 00Z MONDAY-12Z SATURDAY...UPDATED 12Z...

SUNDAY NIGHT...VFR.

MONDAY...VFR.

TUESDAY...VFR.

WEDNESDAY...CHC TSRA. OTHERWISE VFR.

THURSDAY...VFR.

FRIDAY...VFR.

RATZER

&&

.MARINE...
305 PM CDT

LOW PRESSURE OVER NORTHERN LOWER MI WILL MOVE TO WESTERN LAKE
ERIE OVERNIGHT. THE LOW CONTINUES TO TRACK SOUTHEAST INTO THE UPPER
OH VALLEY BY SUNDAY AFTERNOON. MEANWHILE...AN ELONGATED AREA OF HIGH
PRESSURE ACROSS THE CANADIAN PRAIRIES AND NORTHERN PLAINS WILL MOVE
SOUTHEAST BEHIND THE LOW...SETTLING ACROSS THE UPPER MIDWEST AND
NORTHERN GREAT LAKES. THE HIGH WILL CONTINUE TO DRIFT EAST ACROSS
THE WESTERN LAKES ON MONDAY. A PERIOD OF STRONG NORTHERLY WINDS WILL
AFFECT LAKE MICHIGAN LATE TODAY THROUGH SUN NIGHT DUE TO THE
TIGHTENING OF THE PRESSURE GRADIENT BETWEEN THE DEPARTING LOW AND
THE SOUTHEASTWARD ADVANCING HIGH PRESSURE CENTERS.

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...SMALL CRAFT ADVISORY...LMZ740-LMZ741-LMZ742-LMZ743-LMZ744-
     LMZ745...4 AM SUNDAY TO 1 PM MONDAY.

&&

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
430 PM CDT SAT AUG 13 2011

ILZ022-023-INZ001-002-010-011-132215-
JASPER IN-KANKAKEE IL-LAKE IN-NEWTON IN-PORTER IN-WILL IL-
430 PM CDT SAT AUG 13 2011

...SPECIAL WEATHER STATEMENT...

AT 426 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM BEVERLY SHORES IN PORTER
COUNTY INDIANA TO GRANT PARK IN KANKAKEE COUNTY...MOVING EAST AT 35
MPH.

UP TO PENNY SIZE HAIL...WINDS TO 45 MPH...OCCASIONAL CLOUD
TO GROUND LIGHTNING...BRIEF DOWNPOURS...ARE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
  CHESTERTON...         CROWN POINT...        CEDAR LAKE...
  BEVERLY SHORES...     PORTER...             TOWN OF PINES...
  MERRILLVILLE...       BURNS HARBOR...       PORTAGE...
  HOBART...             NEW CHICAGO...        GRANT PARK...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW
AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. HEAVY
RAINFALL CAN LEAD TO FLOODING OF LOW LYING AREAS SUCH AS DITCHES...
VIADUCTS...UNDERPASSES...CREEKS AND DRAINAGE AREAS. SEEK SHELTER IN A
STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED.

LAT...LON 4107 8720 4124 8774 4166 8713 4165 8712
      4172 8694 4171 8693 4125 8692

ALLSOPP

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PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
431 PM CDT SAT AUG 13 2011

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

1058 AM     HAIL             PECATONICA              42.31N 89.36W
08/13/2011  M0.25 INCH       WINNEBAGO          IL   EMERGENCY MNGR

1103 AM     HAIL             PECATONICA              42.31N 89.36W
08/13/2011  E0.88 INCH       WINNEBAGO          IL   PUBLIC

            PEA TO NICKEL SIZE HAIL. RELAYED BY MEDIA.

1131 AM     HAIL             ROCKFORD                42.27N 89.06W
08/13/2011  E0.75 INCH       WINNEBAGO          IL   AMATEUR RADIO

            DIME SIZE HAIL NEAR 25TH AND HARRISON.

1135 AM     HAIL             ROCKFORD                42.27N 89.06W
08/13/2011  M0.25 INCH       WINNEBAGO          IL   TRAINED SPOTTER

            TRAINER AND STATE STREETS.

1137 AM     HAIL             ROCKFORD                42.27N 89.06W
08/13/2011  M0.75 INCH       WINNEBAGO          IL   BROADCAST MEDIA

            PEA AND NICKEL SIZE HAIL AND TORRENTIAL RAINFALL.

1137 AM     HAIL             CHERRY VALLEY           42.24N 88.96W
08/13/2011  E0.50 INCH       WINNEBAGO          IL   PUBLIC

            RELAYED BY MEDIA.

1151 AM     HAIL             1 S BELVIDERE           42.24N 88.85W
08/13/2011  M0.25 INCH       BOONE              IL   TRAINED SPOTTER

1204 PM     HAIL             3 SSE OREGON            41.97N 89.32W
08/13/2011  E0.75 INCH       OGLE               IL   TRAINED SPOTTER

            DIME SIZE HAIL OR BIGGER IN DAYSVILLE.

1243 PM     HAIL             2 E MCHENRY             42.34N 88.25W
08/13/2011  M0.25 INCH       MCHENRY            IL   TRAINED SPOTTER

1248 PM     HAIL             FOX LAKE                42.42N 88.18W
08/13/2011  E0.25 INCH       LAKE               IL   TRAINED SPOTTER

1250 PM     HAIL             LAKEMOOR                42.34N 88.20W
08/13/2011  M0.25 INCH       MCHENRY            IL   TRAINED SPOTTER

            FOR 2 MINUTES.

1251 PM     HAIL             ROUND LAKE              42.35N 88.11W
08/13/2011  M0.25 INCH       LAKE               IL   TRAINED SPOTTER

1253 PM     HAIL             CARY                    42.21N 88.25W
08/13/2011  E0.25 INCH       MCHENRY            IL   TRAINED SPOTTER

1255 PM     HAIL             DE KALB                 41.93N 88.75W
08/13/2011  E0.25 INCH       DEKALB             IL   COCORAHS

            PEA SIZE HAIL AND SLIGHTLY LARGER

1259 PM     HAIL             WAUCONDA                42.27N 88.14W
08/13/2011  M0.50 INCH       LAKE               IL   EMERGENCY MNGR

0102 PM     HAIL             MUNDELEIN               42.27N 88.00W
08/13/2011  E0.50 INCH       LAKE               IL   TRAINED SPOTTER

            MIXED PEA AND MARBLE SIZE HAIL.

0104 PM     HAIL             LAKE ZURICH             42.19N 88.09W
08/13/2011  E0.25 INCH       LAKE               IL   TRAINED SPOTTER

            INTERSECTION OF RAND ROAD AND MILLER ROAD.

0115 PM     HAIL             1 N BUFFALO GROVE       42.18N 87.96W
08/13/2011  E0.25 INCH       LAKE               IL   COCORAHS

0116 PM     TSTM WND GST     MOUNT PROSPECT          42.07N 87.94W
08/13/2011  E50.00 MPH       COOK               IL   TRAINED SPOTTER

0117 PM     HAIL             HOFFMAN ESTATES         42.06N 88.14W
08/13/2011  E0.50 INCH       COOK               IL   TRAINED SPOTTER

            1/4 IN TO 1/2 IN. PALATINE RD AND BARRINGTON RD.

0120 PM     HAIL             ROLLING MEADOWS         42.08N 88.03W
08/13/2011  E0.25 INCH       COOK               IL   TRAINED SPOTTER

            PLUM GROVE RD AND UCLID ST.

0122 PM     TSTM WND GST     ARLINGTON HEIGHTS       42.09N 87.98W
08/13/2011  E50.00 MPH       COOK               IL   TRAINED SPOTTER

            SEVERAL 1-2 INCH DIAMETER BRANCHES DOWN.

0130 PM     HEAVY RAIN       ARLINGTON HEIGHTS       42.09N 87.98W
08/13/2011  E0.55 INCH       COOK               IL   TRAINED SPOTTER

            0.55 RAINFALL IN 15 MINUTES NEAR RAND RD AND THOMAS. ALSO
            HAD PEA SIZE HAIL.

0130 PM     HAIL             PALATINE                42.11N 88.04W
08/13/2011  E1.00 INCH       COOK               IL   AMATEUR RADIO

0131 PM     HAIL             HIGHLAND PARK           42.18N 87.81W
08/13/2011  E0.25 INCH       LAKE               IL   AMATEUR RADIO

0133 PM     HAIL             NORTH AURORA            41.80N 88.33W
08/13/2011  E0.25 INCH       KANE               IL   NWS EMPLOYEE

            NEAR THE INTERSECTION OF I-88 AND ORCHARD ROAD.

0135 PM     HAIL             ELK GROVE VILLAGE       42.01N 87.99W
08/13/2011  E0.25 INCH       COOK               IL   TRAINED SPOTTER

0143 PM     TSTM WND DMG     EVANSTON                42.05N 87.69W
08/13/2011                   COOK               IL   TRAINED SPOTTER

            LARGE BRANCH DOWN ON CAR WITH MOTORIST POSSIBLY TRAPPED.
            NO INJURIES. GROSS POINT ROAD AND PARK PLACE. WINDS
            ESTIMATED 40 MPH.

0148 PM     HAIL             EVANSTON                42.05N 87.69W
08/13/2011  E0.75 INCH       COOK               IL   TRAINED SPOTTER

            ACROSS FROM POST OFFICE - DAVIS AND OAK ST.

0157 PM     HAIL             OAK PARK                41.89N 87.79W
08/13/2011  E1.00 INCH       COOK               IL   TRAINED SPOTTER

            MOST HAIL 0.50 TO 0.88 BUT A COUPLE OF 1 INCH NEAR HARLEM
            AND CHICAGO ST. LASTED 3 TO 4 MINUTES.

0159 PM     HAIL             NAPERVILLE              41.76N 88.15W
08/13/2011  E0.88 INCH       DUPAGE             IL   TRAINED SPOTTER

            75TH ST AND RICKERT.

0200 PM     HAIL             1 NW OTTAWA             41.36N 88.85W
08/13/2011  E0.25 INCH       LA SALLE           IL   COCORAHS

            TIME APPROXIMATE.

0201 PM     HAIL             NAPERVILLE              41.76N 88.15W
08/13/2011  E1.00 INCH       DUPAGE             IL   TRAINED SPOTTER

0202 PM     HAIL             FORRESTON               42.13N 89.58W
08/13/2011  E1.75 INCH       OGLE               IL   BROADCAST MEDIA

0203 PM     HAIL             NAPERVILLE              41.76N 88.15W
08/13/2011  E0.50 INCH       DUPAGE             IL   TRAINED SPOTTER

            NORTHWEST SIDE.

0203 PM     HAIL             OAK BROOK               41.84N 87.95W
08/13/2011  E1.00 INCH       DUPAGE             IL   TRAINED SPOTTER

            3/4 INCH TO ONE INCH NEAR BUTTERFILED AND 22ND ST.

0204 PM     HAIL             OAK BROOK               41.84N 87.95W
08/13/2011  E1.00 INCH       DUPAGE             IL   PUBLIC

            NEAR BUTTERFIELD AND IL-83.

0209 PM     HAIL             LISLE                   41.79N 88.09W
08/13/2011  E0.50 INCH       DUPAGE             IL   TRAINED SPOTTER

0209 PM     HAIL             LISLE                   41.79N 88.09W
08/13/2011  E1.00 INCH       DUPAGE             IL   TRAINED SPOTTER

            1/2 MILE WEST OF IL-53. MOST HAIL STONES WERE IN THE 0.50
            INCH RANGE.

0213 PM     HAIL             DOWNERS GROVE           41.80N 88.02W
08/13/2011  E0.75 INCH       DUPAGE             IL   STORM CHASER

            NEAR DUNHAM AND MAPLE.

0213 PM     HAIL             1 SSE MUNDELEIN         42.25N 88.00W
08/13/2011  E0.50 INCH       LAKE               IL   TRAINED SPOTTER

0215 PM     HAIL             WOODRIDGE               41.74N 88.04W
08/13/2011  E0.75 INCH       DUPAGE             IL   TRAINED SPOTTER

            NEAR 53RD ST AND I-355.

0217 PM     HAIL             4 NE CHICAGO            41.92N 87.57W
08/13/2011  E0.25 INCH       LMZ741             IL   COCORAHS

0217 PM     HAIL             CHICAGO                 41.88N 87.63W
08/13/2011  E0.25 INCH       COOK               IL   COCORAHS

0217 PM     HAIL             DOWNERS GROVE           41.80N 88.02W
08/13/2011  E1.00 INCH       DUPAGE             IL   TRAINED SPOTTER

0220 PM     HAIL             CLARENDON HILLS         41.80N 87.96W
08/13/2011  E1.00 INCH       DUPAGE             IL   TRAINED SPOTTER

            NEAR PROSPECT AND PARK.

0220 PM     HAIL             WOODRIDGE               41.74N 88.04W
08/13/2011  E0.25 INCH       DUPAGE             IL   TRAINED SPOTTER

            1/4 TO 3/8 INCH HAIL NEAR 75TH ST AND LEMONT RD.

0221 PM     HAIL             CHICAGO                 41.88N 87.63W
08/13/2011  E0.75 INCH       COOK               IL   PUBLIC

            1/2 TO 3/4 INCH HAIL NEAR WEST ERIE.

0221 PM     HAIL             WOODRIDGE               41.74N 88.04W
08/13/2011  E0.75 INCH       DUPAGE             IL   TRAINED SPOTTER

            NEAR 75TH AND WOODRIDGE RD.

0223 PM     HAIL             LISLE                   41.79N 88.09W
08/13/2011  E1.00 INCH       DUPAGE             IL   TRAINED SPOTTER

            NEAR YACKLEY AND OHIO.

0227 PM     HAIL             CLARENDON HILLS         41.80N 87.96W
08/13/2011  E0.75 INCH       DUPAGE             IL   TRAINED SPOTTER

            NEAR 55TH AND CLSRENDON HILLS RD.

0239 PM     HAIL             INDIAN HEAD PARK        41.77N 87.90W
08/13/2011  E0.25 INCH       COOK               IL   TRAINED SPOTTER

            NEAR I-55 AND I-294.

0239 PM     HAIL             COUNTRYSIDE             41.78N 87.88W
08/13/2011  E0.25 INCH       COOK               IL   TRAINED SPOTTER

            AT LA GRANGE RD AND JOLIET RD.

0244 PM     HAIL             LYONS                   41.81N 87.82W
08/13/2011  E0.50 INCH       COOK               IL   AMATEUR RADIO

            NEAR PLAINFIELD RD AND WOLF RD.

0245 PM     HAIL             SUMMIT                  41.78N 87.82W
08/13/2011  E0.50 INCH       COOK               IL   AMATEUR RADIO

            NEAR ARCHER AND HARLEM.

0245 PM     HAIL             MIDWAY AIRPORT          41.78N 87.75W
08/13/2011  E0.25 INCH       COOK               IL   TRAINED SPOTTER

0249 PM     HAIL             CHICAGO                 41.88N 87.63W
08/13/2011  E0.25 INCH       COOK               IL   AMATEUR RADIO

            NEAR MIDWAY AIRPORT - ARCHER AND CICERO.

0253 PM     HAIL             MIDWAY AIRPORT          41.78N 87.75W
08/13/2011  E0.25 INCH       COOK               IL   TRAINED SPOTTER

            NEAR 55TH AND PULASKI RD.

0256 PM     HAIL             MORRIS                  41.37N 88.43W
08/13/2011  E0.25 INCH       GRUNDY             IL   TRAINED SPOTTER

            PEA SIZE OR A BIT LARGER.

0300 PM     HAIL             MORRIS                  41.37N 88.43W
08/13/2011  E0.75 INCH       GRUNDY             IL   EMERGENCY MNGR

0304 PM     HAIL             MORRIS                  41.37N 88.43W
08/13/2011  E0.25 INCH       GRUNDY             IL   AMATEUR RADIO

            NEAR SPRUCE AND MAIN.

0314 PM     HAIL             3 SE CHANNAHON          41.40N 88.18W
08/13/2011  E0.25 INCH       WILL               IL   AMATEUR RADIO

            AT I-55 AND BLODGET RD - HEAVY HAIL FALL - RAIN FALLING
            AT THE RATE OF 1 INCH PER HOUR- CARS STOPPED ON SHOULDER
            OF I-55.

0320 PM     HAIL             YORKVILLE               41.64N 88.45W
08/13/2011  E1.00 INCH       KENDALL            IL   EMERGENCY MNGR

0323 PM     HAIL             DE KALB                 41.93N 88.75W
08/13/2011  E0.25 INCH       DE KALB            IL   TRAINED SPOTTER

            FAR NORTHWEST SIDE OF DE KALB.

0323 PM     HAIL             DE KALB                 41.93N 88.75W
08/13/2011  M0.50 INCH       DEKALB             IL   TRAINED SPOTTER

            ON CAMPUS OF NIU.

0335 PM     HAIL             MONTGOMERY              41.73N 88.34W
08/13/2011  E0.25 INCH       KANE               IL   AMATEUR RADIO

            DOWNTOWN.

0340 PM     HAIL             WATERMAN                41.77N 88.77W
08/13/2011  E0.25 INCH       DE KALB            IL   TRAINED SPOTTER

            NORTH SIDE OF TOWN.

0350 PM     HAIL             PLAINFIELD              41.62N 88.20W
08/13/2011  E0.88 INCH       WILL               IL   TRAINED SPOTTER

            NEAR 135TH AND IL-59.

0354 PM     HAIL             HINCKLEY                41.77N 88.64W
08/13/2011  E0.25 INCH       DE KALB            IL   LAW ENFORCEMENT

0355 PM     TSTM WND GST     PONTIAC                 40.88N 88.64W
08/13/2011  M53.00 MPH       LIVINGSTON         IL   AWOS

0356 PM     HAIL             2 SW MAPLE PARK         41.89N 88.62W
08/13/2011  E0.25 INCH       DEKALB             IL   TRAINED SPOTTER

            NEAR I-88 AND PRITCHARD RD AND KESLINGER RD

0402 PM     TSTM WND GST     SUGAR GROVE             41.77N 88.46W
08/13/2011  M53.00 MPH       KANE               IL   ASOS

0402 PM     HAIL             PEOTONE                 41.33N 87.80W
08/13/2011  E1.00 INCH       WILL               IL   COCORAHS

            AVERAGE SIZE IS 1/2 INCH. MINOR LEAF DAMAGE - SHREDDED
            LEAVES.

0403 PM     HAIL             PEOTONE                 41.33N 87.80W
08/13/2011  E1.00 INCH       WILL               IL   CO-OP OBSERVER

            HAIL RANGES FROM 1/4 TO ONE INCH.

0410 PM     HAIL             GENEVA                  41.88N 88.31W
08/13/2011  E0.50 INCH       KANE               IL   COCORAHS

            1/4 TO 1/2 INCH.

0413 PM     HAIL             3 SW SANDWICH           41.62N 88.66W
08/13/2011  E0.75 INCH       LA SALLE           IL   TRAINED SPOTTER

            IN THE LAKE HOLIDAY AREA.

&&
MORE REPORTS WILL BE ADDED WHEN RECEIVED.

BN

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