Severe Thunderstorm Warning 162, 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.

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
414 PM CDT SAT AUG 13 2011

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
142115-
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-
414 PM CDT SAT AUG 13 2011 /514 PM EDT SAT AUG 13 2011/

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

.DAY ONE...TONIGHT.

  WEATHER HAZARDS EXPECTED:

  * THUNDERSTORMS...SOME SEVERE...WITH THE FOLLOWING:

  * WIND GUSTS TO 60 MPH
  * FREQUENT LIGHTNING
  * PEA TO QUARTER SIZED HAIL
  * TORRENTIAL DOWNPOURS

  AREAS AFFECTED AND TIMING:

  * CLUSTERS OF THUNDERSTORMS WILL CONTINUE TO AFFECT NORTH
    CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA THROUGH
    THE REMAINDER OF THE AFTERNOON. THE STRONGEST STORMS WILL
    LIKELY OCCUR ALONG AND EAST OF THE INTERSTATE 55 CORRIDOR WITH
    A MORE ISOLATED THREAT TO THE NORTH AND WEST. THUNDER WILL
    BECOME LESS LIKELY EARLY THIS EVENING THOUGH SHOWER ACTIVITY
    WILL CONTINUE.

  DISCUSSION:

  * LOW PRESSURE MOVING ACROSS NORTHEAST ILLINOIS AND SOUTHERN
    LAKE MICHIGAN WILL PUSH A COOL FRONTAL BOUNDARY ACROSS NORTH
    CENTRAL AND NORTHEAST ILLINOIS AND NORTHWEST INDIANA THROUGH
    EARLY EVENING. THE FRONT...IN CONJUNCTION WITH AN UPPER LEVEL
    LOW WILL CONTINUE TO GENERATE CLUSTERS OF STRONG TO SEVERE
    THUNDERSTORMS THROUGH LATE AFTERNOON. THE PRIMARY THREATS WILL
    BE LARGE HAIL TO AROUND THE SIZE OF QUARTERS...THOUGH ISOLATED
    GOLF BALL HAIL IS POSSIBLE...AND WIND GUSTS TO AROUND 60 MPH.
    THE THREAT FOR TORNADOES IS LOW. THE SEVERE THREAT WILL
    DIMINISH EARLY THIS EVENING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THERE IS AN INCREASED RISK FOR RIP CURRENTS ALONG THE ILLINOIS AND INDIANA
SHORES OF LAKE MICHIGAN SUNDAY THROUGH MONDAY MORNING.

THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS TUESDAY THROUGH
WEDNESDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS WILL LIKELY BE NEEDED THROUGH LATE THIS AFTERNOON.

&&

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

LMZ740>745-142115-
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-
414 PM CDT SAT AUG 13 2011

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

.DAY ONE...TONIGHT.

SHOWERS AND THUNDERSTORMS WILL CONTINUE INTO THE EARLY EVENING
HOURS. WIND GUSTS IN EXCESS OF 34 KT ARE POSSIBLE LATE THIS
AFTERNOON.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS TUESDAY THROUGH
WEDNESDAY NIGHT.

STRONG WINDS AND HIGH WAVES MAY LEAD TO HAZARDOUS CONDITIONS FOR
SMALL CRAFT SUNDAY MORNING THROUGH MONDAY MORNING.

&&

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-
870-872-874-876-878-142115-
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-
414 PM CDT SAT AUG 13 2011

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

.DAY ONE...TONIGHT.

THUNDERSTORMS WILL CONTINUE TO BE POSSIBLE INTO EARLY EVENING...MAINLY
ACROSS FAR SOUTHERN LAKE MICHIGAN. WIND GUSTS IN EXCESS OF 34 KT
ARE POSSIBLE LATE THIS AFTERNOON.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS TUESDAY NIGHT
THROUGH WEDNESDAY NIGHT.

&&

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

MDB

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

ILZ012>014-019>022-132200-
COOK IL-DUPAGE IL-GRUNDY IL-KANE IL-KENDALL IL-LA SALLE IL-WILL IL-
414 PM CDT SAT AUG 13 2011

...SPECIAL WEATHER STATEMENT...

AT 412 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM ST. CHARLES TO MONTGOMERY
TO YORKVILLE TO NEWARK...MOVING EAST AT 30 MPH.

UP TO PENNY SIZE HAIL...WINDS UP TO 50 MPH...BRIEF HEAVY DOWNPOURS...
ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
  MONTGOMERY...         BATAVIA...            NORTH AURORA...
  NEWARK...             YORKVILLE...          ST. CHARLES...
  GENEVA...             WAYNE...              PLANO...
  SHERIDAN...           SUGAR GROVE...        ELBURN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE
OBJECTS TO BLOW AROUND. 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 4196 8780 4171 8789 4158 8799 4138 8823
      4141 8879 4164 8859 4179 8854 4202 8843

BMD

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

ILZ023-033-132200-
IROQUOIS IL-KANKAKEE IL-
419 PM CDT SAT AUG 13 2011

...SPECIAL WEATHER STATEMENT...

AT 412 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG
THUNDERSTORM NEAR CLIFTON...MOVING EAST AT 35 MPH.

UP TO PENNY SIZE HAIL...WINDS TO 45 MPH...OCCASIONAL CLOUD
TO GROUND LIGHTNING...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
  CLIFTON...MARTINTON AND BEAVERVILLE

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...
CREEKS AND DRAINAGE AREAS. SEEK SHELTER IN A STURDY STRUCTURE UNTIL
THIS STORM HAS PASSED.

LAT...LON 4099 8754 4076 8753 4091 8807 4100 8806

ALLSOPP