THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
SOUTHERN CENTRAL COOK COUNTY IN NORTHEAST ILLINOIS...
WILL COUNTY IN NORTHEAST ILLINOIS...

* UNTIL 1030 PM CDT

* AT 931 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DESTRUCTIVE HAIL UP
TO BASEBALL SIZE...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS
STORM WAS LOCATED NEAR DOUGLAS PARK...OR NEAR CHICAGO...AND MOVING
SOUTH AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
RIVERSIDE...STICKNEY...LYONS...MIDWAY AIRPORT...SUMMIT...CHATHAM...
JUSTICE...OAK LAWN...WILLOW SPRINGS...WORTH...ALSIP...BLUE
ISLAND...DOLTON...POSEN...MIDLOTHIAN...ORLAND PARK...GLENWOOD...
TINLEY PARK...FLOSSMOOR AND CHICAGO HEIGHTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR LARGE DESTRUCTIVE HAIL CAPABLE OF PRODUCING
SIGNIFICANT DAMAGE. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL COOK
COUNTY UNTIL 930 PM CDT...

AT 917 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DESTRUCTIVE HAIL UP TO
TENNIS BALL SIZE...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS
STORM WAS LOCATED NEAR MONTROSE HARBOR...MOVING SOUTH AT 35 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
THE CHICAGO LOOP BY 930 PM CDT.
DOUGLAS PARK...NORTHERLY ISLAND...BRIDGEPORT AND CICERO AROUND 930
PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A SUPERCELL THUNDERSTORM. DUE TO THE ROTATING NATURE OF
SUPERCELLS...THEY ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE
WEATHER...INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE
WINDS AND POSSIBLY TORNADOES. BE PREPARED TO ACT QUICKLY SHOULD A
TORNADO OCCUR OR A TORNADO WARNING BE ISSUED.

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN COOK
AND NORTHEASTERN DUPAGE COUNTIES UNTIL 930 PM CDT...

AT 854 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...AND
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS STORM WAS LOCATED NEAR
GLENCOE...MOVING SOUTH AT 40 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
SKOKIE...MORTON GROVE...EVANSTON AND NILES AROUND 905 PM CDT.
PARK RIDGE...ROSEMONT AND MONTROSE HARBOR AROUND 910 PM CDT.
HARWOOD HEIGHTS...LOGAN SQUARE...NORRIDGE AND SCHILLER PARK AROUND
915 PM CDT.
OAK PARK...RIVER FOREST...HUMBOLDT PARK AND MELROSE PARK AROUND 920
PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A SUPERCELL THUNDERSTORM. DUE TO THE ROTATING NATURE OF
SUPERCELLS...THEY ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE
WEATHER...INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE
WINDS AND POSSIBLY A TORNADO. BE PREPARED TO ACT QUICKLY SHOULD A
TORNADO OCCUR OR A TORNADO WARNING BE ISSUED.

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
LAKE...SOUTHERN COOK AND NORTHERN WILL COUNTIES UNTIL 945 PM CDT...

AT 850 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM OAK LAWN TO OGDEN DUNES...MOVING
SOUTH AT 30 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
POSEN...PHOENIX...MIDLOTHIAN AND DOLTON AROUND 900 PM CDT.
ORLAND PARK...THORNTON...SOUTH HOLLAND AND OAK FOREST AROUND 905 PM
CDT.
TINLEY PARK...LYNWOOD...HOMEWOOD AND HAZEL CREST AROUND 910 PM CDT.
MOKENA...OLYMPIA FIELDS AND FORD HEIGHTS AROUND 915 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS LINE OF SEVERE THUNDERSTORMS INCLUDE
PALOS HEIGHTS...ROBBINS...RIVERDALE...PALOS PARK...EAST HAZEL
CREST...ORLAND HILLS...FRANKFORT SQUARE AND SOUTH CHICAGO HEIGHTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A SUPERCELL THUNDERSTORM. DUE TO THE ROTATING NATURE OF
SUPERCELLS...THEY ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE
WEATHER...INCLUDING EXTREMELY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE
WINDS AND POSSIBLY TORNADOES. BE PREPARED TO ACT QUICKLY SHOULD A
TORNADO OCCUR OR A TORNADO WARNING BE ISSUED.

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
COOK...SOUTHEASTERN LAKE AND NORTHEASTERN DUPAGE COUNTIES UNTIL 930
PM CDT...

AT 845 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
DESTRUCTIVE HURRICANE FORCE WINDS IN EXCESS OF 80 MPH. THIS STORM
WAS LOCATED 6 MILES NORTHEAST OF HIGHLAND PARK...MOVING SOUTH AT 40
MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
GLENCOE...NORTHBROOK AND DEERFIELD AROUND 855 PM CDT.
WILMETTE...WINNETKA...WILMETTE HARBOR AND KENILWORTH AROUND 900 PM
CDT.
SKOKIE...MORTON GROVE...EVANSTON AND NILES AROUND 905 PM CDT.
PARK RIDGE...MONTROSE HARBOR AND ROSEMONT AROUND 910 PM CDT.
HARWOOD HEIGHTS AROUND 915 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE GOLF...
LINCOLNWOOD...ELMWOOD PARK...RIVER GROVE...BROADVIEW...LA GRANGE PARK
AND MCCOOK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A SUPERCELL THUNDERSTORM. DUE TO THE ROTATING NATURE OF
SUPERCELLS...THEY ARE CAPABLE OF PRODUCING ALL TYPES OF SEVERE
WEATHER...INCLUDING VERY LARGE HAIL...DESTRUCTIVE STRAIGHT LINE
WINDS AND EVEN OCCASIONALLY TORNADOES. BE PREPARED TO ACT QUICKLY
SHOULD A TORNADO OCCUR OR A TORNADO WARNING BE ISSUED.

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
SOUTHERN COOK COUNTY IN NORTHEAST ILLINOIS...
NORTHERN WILL COUNTY IN NORTHEAST ILLINOIS...
NORTHERN LAKE COUNTY IN NORTHWEST INDIANA...

* UNTIL 945 PM CDT

* AT 836 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PING PONG BALL
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM OAK PARK TO 7 MILES EAST
OF HYDE PARK TO 10 MILES NORTHEAST OF WHITING TO 10 MILES NORTHWEST
OF BEVERLY SHORES...AND MOVING SOUTH AT 30 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
COUNTRYSIDE...CHATHAM AND WHITING AROUND 850 PM CDT.
JUSTICE...HODGKINS...INDIAN HEAD PARK AND OAK LAWN AROUND 855 PM
CDT.
PALOS HILLS...HICKORY HILLS...WILLOW SPRINGS AND WORTH AROUND 900
PM CDT.
SOUTH HOLLAND...POSEN...PHOENIX AND MIDLOTHIAN AROUND 905 PM CDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
BRIDGEVIEW...HOMETOWN...RIVERDALE...CALUMET PARK...PALOS PARK...
ROBBINS...PALOS HEIGHTS...EAST HAZEL CREST...ORLAND HILLS AND SOUTH
CHICAGO HEIGHTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
NORTHERN AND CENTRAL COOK COUNTY IN NORTHEAST ILLINOIS...
THIS INCLUDES THE CITY OF CHICAGO
NORTHEASTERN DUPAGE COUNTY IN NORTHEAST ILLINOIS...
SOUTHEASTERN LAKE COUNTY IN NORTHEAST ILLINOIS...

* UNTIL 930 PM CDT

* AT 832 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
DANGEROUS SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DESTRUCTIVE HURRICANE FORCE WINDS IN EXCESS OF 80 MPH.
THIS STORM WAS LOCATED 9 MILES EAST OF NORTH CHICAGO...AND MOVING
SOUTH SOUTHWEST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
HIGHLAND PARK AROUND 850 PM CDT.
GLENCOE...NORTHBROOK AND DEERFIELD AROUND 855 PM CDT.
WILMETTE...WINNETKA...WILMETTE HARBOR AND KENILWORTH AROUND 900 PM
CDT.
SKOKIE...MORTON GROVE...EVANSTON AND NILES AROUND 905 PM CDT.
PARK RIDGE...ROSEMONT AND MONTROSE HARBOR AROUND 910 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
HIGHWOOD...GOLF...LINCOLNWOOD...ELMWOOD PARK...RIVER GROVE...
BROADVIEW...LA GRANGE PARK...MCCOOK AND BRIDGEVIEW.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS EXHIBITED SOME ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
EASTERN LAKE COUNTY IN NORTHEAST ILLINOIS...

* UNTIL 845 PM CDT

* AT 819 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
IN EXCESS OF 70 MPH. THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM ZION TO BEACH PARK TO 11 MILES EAST OF BEACH PARK...
AND MOVING SOUTH AT 40 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
GURNEE...GRANDWOOD PARK AND WAUKEGAN AROUND 830 PM CDT.
GAGES LAKE...THIRD LAKE...GRAYSLAKE AND PARK CITY AROUND 835 PM
CDT.
LIBERTYVILLE...MUNDELEIN...LAKE FOREST AND HIGHLAND PARK AROUND 840
PM CDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE LAKE
BLUFF...HIGHWOOD AND METTAWA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WIND DAMAGE WITH THESE STORMS WILL OCCUR WITHOUT ANY RAIN. DO NOT
WAIT FOR THE SOUND OF THUNDER OR RAIN BEFORE TAKING COVER. SEEK
SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
579 IN EFFECT UNTIL MIDNIGHT CDT /1 AM EDT/ TONIGHT FOR THE
FOLLOWING AREAS

IN ILLINOIS THIS WATCH INCLUDES 6 COUNTIES

IN EAST CENTRAL ILLINOIS

IROQUOIS

IN NORTHEAST ILLINOIS

COOK DUPAGE KANKAKEE
LAKE IL WILL

IN INDIANA THIS WATCH INCLUDES 5 COUNTIES

IN NORTHWEST INDIANA

BENTON JASPER LAKE IN
NEWTON PORTER

THIS INCLUDES THE CITIES OF...CHICAGO...FOWLER...GARY...JOLIET...
KANKAKEE...MOROCCO...RENSSELAER...VALPARAISO...WATSEKA...
WAUKEGAN AND WHEATON.

A GROUP OF SHOWERS AND THUNDERSTORMS HAVE DEVELOPED OVER LAKE
MICHIGAN AND ARE AFFECTING SOUTHERN COOK...EASTERN WILL...AND
NORTH EASTERN KANKAKEE COUNTIES.

LOCATIONS IMPACTED BY THIS ACTIVITY COULD EXPERIENCE BRIEF
MODERATE TO LOCALLY HEAVY SHOWERS...NICKEL SIZED HAIL...AND
POSSIBLE WIND GUSTS TO 50 MPH.

DAY ONE...TONIGHT.

THERE IS A CHANCE SCATTERED THUNDERSTORMS WILL DEVELOP THIS
THIS EVENING...GENERALLY ALONG AND NORTH OF A LINE FROM ROCKFORD
TO CHICAGO TO RENSSELAER. THE THREAT FOR SEVERE STORMS IS LOW.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

HIGH TEMPERATURES ARE EXPECTED TO REACH INTO THE MIDDLE AND UPPER
90S ON FRIDAY. IN COMBINATION WITH DEW POINTS IN THE LOWER
70S...HEAT INDEX VALUES AROUND 105 ARE EXPECTED FRIDAY
AFTERNOON...MAINLY NORTH AND WEST OF A LINE FROM PONTIAC TO
CHICAGO WITH VALUES OF AROUND 100 ELSEWHERE.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS NORTHWEST INDIANA
FRIDAY MORNING. A COLD FRONT WILL BRING ADDITIONAL CHANCES FOR
THUNDERSTORMS FRIDAY NIGHT OVER PORTIONS OF FAR NORTHERN ILLINOIS.

THERE WILL BE PERIODIC CHANCES OF MORE THUNDERSTORMS ACROSS THE
ENTIRE OUTLOOK AREA FROM SATURDAY...AND AGAIN SUNDAY NIGHT THROUGH
WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NECESSARY THROUGH TONIGHT.

..HEAT ADVISORY IN EFFECT FROM NOON FRIDAY TO MIDNIGHT CDT
FRIDAY NIGHT...

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A HEAT
ADVISORY...WHICH IS IN EFFECT FROM NOON FRIDAY TO MIDNIGHT CDT
FRIDAY NIGHT.

* TEMPS/HEAT INDEX...TEMPERATURES ACROSS THE ADVISORY AREA ARE
FORECAST TO REACH THE MIDDLE AND UPPER 90S...WITH HIGH HUMIDITY
CONTRIBUTING TO HEAT INDEX VALUES OF AROUND 105 DEGREES.

* IMPACTS...THE COMBINATION OF HEAT AND HUMIDITY WILL CREATE
OPPRESSIVE CONDITIONS WHICH MAY CAUSE HEAT RELATED ILLNESSES TO
DEVELOP WITH PROLONGED EXPOSURE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE EXTRA PRECAUTIONS...IF YOU WORK OR SPEND TIME OUTSIDE. WHEN
POSSIBLE...RESCHEDULE STRENUOUS ACTIVITIES TO EARLY MORNING OR
EVENING. KNOW THE SIGNS AND SYMPTOMS OF HEAT EXHAUSTION AND HEAT
STROKE. WEAR LIGHT WEIGHT AND LOOSE FITTING CLOTHING WHEN
POSSIBLE AND DRINK PLENTY OF WATER.

TO REDUCE RISK DURING OUTDOOR WORK...THE OCCUPATIONAL SAFETY AND
HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS
IN SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY
HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE
IS AN EMERGENCY...CALL 9 1 1.

A HEAT ADVISORY MEANS THAT A PERIOD OF HOT WEATHER IS EXPECTED.
HIGH TEMPERATURES AND HIGH HUMIDITY WILL COMBINE TO CREATE A
SITUATION IN WHICH HEAT ILLNESSES ARE POSSIBLE. DRINK PLENTY OF
FLUIDS...STAY IN AN AIR-CONDITIONED ROOM...STAY OUT OF THE SUN...
AND CHECK UP ON RELATIVES AND NEIGHBORS.

CHILDREN AND PETS SHOULD NEVER BE LEFT UNATTENDED IN VEHICLES
UNDER ANY CIRCUMSTANCES. THIS IS ESPECIALLY TRUE DURING HOT
WEATHER WHEN THE CAR INTERIOR CAN REACH LETHAL TEMPERATURES IN A
MATTER OF MINUTES!

..HOT AND HUMID CONDITIONS ARRIVE FRIDAY...

OVER MUCH OF THE REGION FRIDAY...TEMPERATURES ARE FORECAST TO RISE
WELL INTO THE 90S. MOISTURE WILL BE STREAMING NORTH ON
FRIDAY...WHICH COMBINED WITH HIGH TEMPERATURES WILL CREATE HUMID
CONDITIONS FOR MUCH OF NORTHERN ILLINOIS AND NORTHWEST INDIANA. THE
CHALLENGE CONTINUES TO BE HOW WARM SURFACE TEMPERATURES BECOME
FRIDAY AFTERNOON.

A RETROSPECTIVE LOOK AT THE MOST RECENT EXTREME TEMPERATURE EVENTS
FOR CHICAGO...

THE LAST FIVE 100 DEGREE DAYS RECORDED AT OHARE AIRPORT ARE AS
FOLLOWS

JULY 24TH 2005.............102
JULY 30TH 1999.............101
JULY 14TH 1995.............100
JULY 13TH 1995.............104
AUGUST 2ND 1991............101

THE RECORD FOR JULY 1ST FOR OHARE AIRPORT IS 103 DEGREES SET IN 1956.

THE RECORD FOR ROCKFORD AIRPORT IS 101 DEGREES SET IN
1931...HOWEVER...ROCKFORDS CURRENT FORECAST FOR A HIGH ON FRIDAY IS
95 DEGREES.

..HEAT WAVE ON FRIDAY JULY 1ST...

FRIDAY FOR NORTHERN ILLINOIS LOOKS TO BE OPPRESSIVELY HOT...AS HIGH
TEMPERATURES FORECAST FOR THE DAY RANGE FROM THE MIDDLE TO UPPER 90S
FOR MUCH OF THE AREA AND 100 DEGREES IN CHICAGO. WITH THIS EXTREME
HEAT WAVE...IT IS WORTHWHILE TO LOOK BACK AT THE MOST RECENT EXTREME
TEMPERATURE EVENTS FOR CHICAGO.

THE LAST FIVE 100 DEGREE DAYS RECORDED AT OHARE AIRPORT ARE AS
FOLLOWS

JULY 24TH 2005.............102
JULY 30TH 1999.............101
JULY 14TH 1995.............100
JULY 13TH 1995.............104
AUGUST 2ND 1991............101

THE RECORD FOR JULY 1ST FOR OHARE AIRPORT IS 103 DEGREES SET IN 1956.

THE RECORD FOR ROCKFORD AIRPORT IS 101 DEGREES SET IN
1931...HOWEVER...ROCKFORDS CURRENT FORECAST FOR A HIGH ON FRIDAY IS
95 DEGREES.

HIGH TEMPERATURES ARE EXPECTED TO REACH WELL INTO THE 90S ON
FRIDAY. IN COMBINATION WITH DEW POINTS IN THE LOWER 70S...HEAT
INDEX VALUES AROUND 105 ARE LIKELY FRIDAY AFTERNOON.

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS THURSDAY NORTHEAST OF A
LINE FROM ROCKFORD TO CHICAGO. THERE IS A CHANCE OF THUNDERSTORMS
FRIDAY NIGHT OVER PORTIONS OF FAR NORTHERN ILLINOIS...AND
PERIODICALLY OVER THE ENTIRE AREA SATURDAY THROUGH MONDAY.

.

HIGH TEMPERATURES ARE EXPECTED TO REACH WELL INTO THE 90S ON
FRIDAY. IN COMBINATION WITH DEW POINTS IN THE LOWER 70S...HEAT
INDEX VALUES AROUND 105 ARE LIKELY FRIDAY AFTERNOON.

THERE IS A CHANCE OF THUNDERSTORMS FRIDAY NIGHT OVER PORTIONS OF
FAR NORTHERN ILLINOIS...AND PERIODICALLY OVER THE ENTIRE AREA
SATURDAY THROUGH MONDAY.

HIGH TEMPERATURES ARE EXPECTED TO REACH WELL INTO THE 90S ON
FRIDAY. IN COMBINATION WITH DEW POINTS IN THE LOWER 70S...HEAT
INDEX VALUES BETWEEN 100 AND 105 ARE POSSIBLE FRIDAY AFTERNOON.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

WEATHER HAZARDS EXPECTED:

THUNDERSTORMS...THE STRONGEST STORMS MAY PRODUCE:

GUSTY WINDS TO 50 MPH.
BRIEF DOWNPOURS.
FREQUENT LIGHTNING.

AREAS AFFECTED AND TIMING:

SCATTERED THUNDERSTORMS MAY DEVELOP ACROSS THE ENTIRE FORECAST
AREA DURING THE MID TO LATE AFTERNOON HOURS AND CONTINUE INTO
EARLY THIS EVENING.

...STRAIGHT LINE WIND DAMAGE CONFIRMED IN LAKE COUNTY ILLINOIS...

NATIONAL WEATHER SERVICE METEOROLOGISTS SURVEYED DAMAGE IN LAKE
COUNTY, IL WHICH WAS SUSTAINED FROM THUNDERSTORMS ON JUNE 21,
2011. DAMAGE WHICH OCCURRED IN WAUKEGAN WAS DETERMINED TO BE FROM
STRAIGHT LINE WINDS. MULTIPLE TREE DAMAGE WAS OBSERVED JUST WEST
OF THE DOWNTOWN AREA, WITH SEVERAL HARDWOOD TREES BLOWN OVER TO
THE NORTHEAST IN A DIVERGENT ORIENTATION. THE LARGEST OF THE TREES
WERE 3-5 FOOT IN DIAMETER WITH MOST OF THE OTHER DAMAGE CONSISTING
OF 3-6 INCH LIMBS DOWN.

AREAS TO THE SOUTH ALONG ROUTE 43 TOWARDS DEERFIELD WERE ALSO
SURVEYED WITH ONCE AGAIN MOST AREAS SUSTAINING TREE DAMAGE, WITH
ONCE AGAIN STRAIGHT LINE WIND DAMAGE THE CAUSE. WIDESPREAD DAMAGE
OF 3-6 INCH LIMBS DOWN WAS OBSERVED WITH LOCALIZED POCKETS OF
ENHANCED TREE DAMAGE. ONE LOCATION WHICH OBSERVED THIS ENHANCED
DAMAGE WAS NEAR BANNOCKBURN, JUST NORTH OF THE DEERFIELD HIGH
SCHOOL. LARGE HEALTHY HARDWOOD TREES WERE BLOWN OVER TO THE
NORTHEAST WITH SEVERAL SOFTWOOD TREES UPROOTED. THIS TREE DAMAGE
ALSO AFFECTED AN ATHLETIC GYM WHERE A PORTION OF THE TREE
COLLAPSED UPON A LIGHT POLE, KNOCKING IT COMPLETELY OVER.

Damage in Mount Prospect:
The most intense damage was approximately 200 yards wide and was a couple of miles long. This damage path started near the intersection of West Golf and South We Go trail and extended north-northeastward to near the Kensington Rd and North Pine St intersection.   There was no conclusive evidence found to suggest that the damage was a result of a tornado, therefore it is considered to be the result of strong straight line winds. The damage found consisted of large hardwood trees snapped and large soft and hardwood uprooted trees, along with roof damage to area buildings. This damage is consistent with straight line winds of 90 to 100 mph.  

...JUNE 21ST MEASURED THUNDERSTORM WIND GUSTS...

0220 PM     TSTM WND GST     ESE HARVARD             42.42N 88.61W
06/21/2011  M51.00 MPH       MCHENRY            IL   MESONET

0650 PM     TSTM WND GST     PERU                    41.34N 89.13W
06/21/2011  M75.00 MPH       LA SALLE           IL   AWOS

0658 PM     TSTM WND GST     1 SE LOSTANT            41.13N 89.05W
06/21/2011  M60.00 MPH       LA SALLE           IL   TRAINED SPOTTER

0720 PM     TSTM WND GST     PONTIAC                 40.88N 88.64W
06/21/2011  M71.00 MPH       LIVINGSTON         IL   TRAINED SPOTTER

0817 PM     TSTM WND GST     ROMEOVILLE              41.65N 88.09W
06/21/2011  M51.00 MPH       WILL               IL   OFFICIAL NWS OBS

0825 PM     TSTM WND GST     4 WSW LISLE             41.77N 88.16W
06/21/2011  M58.00 MPH       DUPAGE             IL   MESONET

0830 PM     TSTM WND GST     ROMEOVILLE              41.65N 88.09W
06/21/2011  M60.00 MPH       WILL               IL   OFFICIAL NWS OBS

0830 PM     TSTM WND GST     5 W BOLINGBROOK         41.70N 88.17W
06/21/2011  M71.00 MPH       WILL               IL   MESONET

0830 PM     TSTM WND GST     ROMEOVILLE              41.65N 88.09W
06/21/2011  M66.00 MPH       WILL               IL   AWOS

0835 PM     TSTM WND GST     BOLINGBROOK             41.70N 88.08W
06/21/2011  M60.00 MPH       WILL               IL   TRAINED SPOTTER

0837 PM     TSTM WND GST     4 SSE CAROL STREAM      41.87N 88.10W
06/21/2011  M59.00 MPH       DUPAGE             IL   MESONET

0841 PM     TSTM WND GST     WHEATON                 41.86N 88.11W
06/21/2011  M62.00 MPH       DUPAGE             IL   ESDA

0845 PM     TSTM WND GST     4 NE CHICAGO            41.92N 87.57W
06/21/2011  M73.00 MPH       LMZ741             IL   C-MAN STATION

0845 PM     TSTM WND GST     LAKE IN THE HILLS       42.19N 88.32W
06/21/2011  M68.00 MPH       MCHENRY            IL   TRAINED SPOTTER

0845 PM     TSTM WND GST     4 NNW EVANSTON          42.10N 87.73W
06/21/2011  M69.00 MPH       COOK               IL   MESONET

0845 PM     TSTM WND GST     SCHAUMBURG              42.03N 88.08W
06/21/2011  M60.00 MPH       COOK               IL   MESONET

0850 PM     TSTM WND GST     MORTON GROVE            42.04N 87.79W
06/21/2011  M66.00 MPH       COOK               IL   EMERGENCY MNGR

0854 PM     TSTM WND GST     WHEELING                42.13N 87.92W
06/21/2011  M81.00 MPH       COOK               IL   ASOS

THE NATIONAL WEATHER SERVICE HAS CANCELLED SEVERE THUNDERSTORM
WATCH 535 FOR THE FOLLOWING AREAS

IN ILLINOIS THIS CANCELS 18 COUNTIES

IN CENTRAL ILLINOIS

LIVINGSTON

IN EAST CENTRAL ILLINOIS

FORD IROQUOIS

IN NORTH CENTRAL ILLINOIS

BOONE DE KALB LA SALLE
LEE OGLE WINNEBAGO

IN NORTHEAST ILLINOIS

COOK DUPAGE GRUNDY
KANE KANKAKEE KENDALL
LAKE IL MCHENRY WILL

IN INDIANA THIS CANCELS 5 COUNTIES

IN NORTHWEST INDIANA

BENTON JASPER LAKE IN
NEWTON PORTER

THIS INCLUDES THE CITIES OF...AURORA...BELVIDERE...CHICAGO...
DEKALB...DIXON...FOWLER...GARY...JOLIET...KANKAKEE...MOROCCO...
MORRIS...OREGON...OSWEGO...OTTAWA...PIPER CITY...PONTIAC...
RENSSELAER...ROCKFORD...VALPARAISO...WATSEKA...WAUKEGAN...
WHEATON AND WOODSTOCK.

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* TORNADO WARNING FOR...
NORTHERN COOK COUNTY...
EASTERN DUPAGE COUNTY...
EASTERN LAKE COUNTY...

* UNTIL 930 PM CDT

* AT 834 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
STORM WAS LOCATED NEAR WESTMONT...AND MOVING NORTH NORTHEAST AT 50
MPH.

* THIS TORNADIC STORM WILL BE NEAR...
NORTHLAKE...BENSENVILLE...FRANKLIN PARK AND STONE PARK AROUND 845
PM.
OHARE AIRPORT...ROSEMONT...PARK RIDGE AND SCHILLER PARK AROUND 850
PM.
DES PLAINES...NILES...MORTON GROVE AND MOUNT PROSPECT AROUND 855
PM.
NORTHBROOK...GLENVIEW AND NORTHFIELD AROUND 900 PM.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE RIVER
GROVE...ELMWOOD PARK...GOLF...HIGHWOOD AND LAKE BLUFF.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING IS AN UPGRADE TO THE SEVERE THUNDERSTORM
WARNING THAT WAS IN EFFECT FOR THE SAME AREA. GO TO A BASEMENT OR
SMALL INTERIOR ROOM ON THE LOWEST FLOOR!

...A TORNADO WARNING REMAINS IN EFFECT FOR WEST CENTRAL COOK...
DUPAGE...EAST CENTRAL DE KALB...NORTHEASTERN GRUNDY...NORTHWESTERN
WILL...KENDALL AND KANE COUNTIES UNTIL 900 PM CDT...

AT 824 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE SQUALL LINE CAPABLE OF PRODUCING DAMAGING STRAIGHT LINE WINDS
AND BRIEF RAIN-WRAPPED TORNADOES. THESE DANGEROUS STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 5 MILES SOUTHWEST OF GILBERTS TO
DUPAGE AIRPORT TO NAPERVILLE TO ROCKDALE...MOVING NORTHEAST AT 45
MPH.

THESE DANGEROUS STORMS WILL BE NEAR...
WOODRIDGE...WHEATON...STREAMWOOD AND LEMONT AROUND 835 PM CDT.
YORK CENTER...WESTMONT...ROSELLE AND MEDINAH AROUND 840 PM CDT.
VILLA PARK AND OAK BROOK AROUND 845 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS LINE OF TORNADO PRODUCING STORMS
INCLUDE GLENDALE HEIGHTS...GLENBARD SOUTH...WILLOWBROOK...
BLOOMINGDALE AND OAKBROOK TERRACE.

* TORNADO WARNING FOR...
NORTHWEST COOK COUNTY...
EASTERN DE KALB COUNTY...
DUPAGE COUNTY...
GRUNDY COUNTY...
KANE COUNTY...
KENDALL COUNTY...
WESTERN WILL COUNTY...

* UNTIL 900 PM CDT

* AT 753 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE SQUALL LINE CAPABLE OF PRODUCING BRIEF RAIN-WRAPPED
TORNADOES IN ADDITION TO WIDESPREAD STRAIGHT LINE WIND DAMAGE.
THESE DANGEROUS STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 5
MILES SOUTH OF CORTLAND TO LITTLE ROCK TO 6 MILES EAST OF NEWARK TO
7 MILES SOUTHWEST OF MAZON...AND MOVING NORTHEAST AT 45 MPH.

* THESE STORMS WILL BE NEAR...
SYCAMORE...SUGAR GROVE...MORRIS AND MAZON AROUND 805 PM.
OSWEGO...MONTGOMERY AND ELBURN AROUND 810 PM.
NORTH AURORA AND AURORA AROUND 815 PM.
MINOOKA...GENEVA...COAL CITY AND BATAVIA AROUND 820 PM.
ST. CHARLES AND SHOREWOOD AROUND 825 PM.

OTHER LOCATIONS IMPACTED BY THESE TORNADIC THUNDERSTORMS INCLUDE
BOULDER HILL...BURLINGTON...CARBON HILL...PINGREE GROVE...SOUTH
ELGIN...CRYSTAL LAWNS...CREST HILL...PRESTON HEIGHTS...GLENDALE
HEIGHTS AND GLENBARD SOUTH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA. GO TO A BASEMENT OR SMALL INTERIOR
ROOM ON THE LOWEST FLOOR!

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
NORTHERN MCHENRY COUNTY IN NORTHEAST ILLINOIS...

* UNTIL 745 PM CDT

* AT 721 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR
HEBRON...OR NEAR WONDER LAKE...AND MOVING NORTH AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
RICHMOND AROUND 735 PM CDT.

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
SOUTHWESTERN DE KALB COUNTY IN NORTH CENTRAL ILLINOIS...
WESTERN GRUNDY COUNTY IN NORTHEAST ILLINOIS...
LA SALLE COUNTY IN NORTH CENTRAL ILLINOIS...
SOUTHEASTERN LEE COUNTY IN NORTH CENTRAL ILLINOIS...
LIVINGSTON COUNTY IN CENTRAL ILLINOIS...

* UNTIL 745 PM CDT

* AT 635 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING HALF DOLLAR SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM DEPUE TO MC NABB TO
HUDSON...AND MOVING NORTHEAST AT 35 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
TONICA AND PERU AROUND 650 PM CDT.
OGLESBY AND LA SALLE AROUND 655 PM CDT.
UTICA AND FLANAGAN AROUND 700 PM CDT.
MENDOTA AND STREATOR AROUND 710 PM CDT.
FAIRBURY...NAPLATE AND GRAND RIDGE AROUND 715 PM CDT.
PONTIAC AND OTTAWA AROUND 720 PM CDT.
EARLVILLE AROUND 725 PM CDT.
PAW PAW AROUND 730 PM CDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
RUTLAND...CEDAR POINT...LOSTANT...DANA...LONG POINT...LEONORE...TROY
GROVE...KANGLEY...CORNELL AND RANSOM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A
SHELTER...PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

SEVERE THUNDERSTORM WATCH 535 IS IN EFFECT UNTIL 100 AM CDT
FOR THE FOLLOWING LOCATIONS

COUNTY SPECIFIC MESSAGE:

/O.NEW.KWNS.SV.A.0535.110621T2245Z-110622T0600Z/

IL
. ILLINOIS COUNTIES INCLUDED ARE

BOONE BUREAU COOK
DE KALB DUPAGE FORD
FULTON GRUNDY HENRY
IROQUOIS KANE KANKAKEE
KENDALL KNOX LAKE
LA SALLE LEE LIVINGSTON
MARSHALL MCHENRY MCLEAN
OGLE PEORIA PUTNAM
STARK STEPHENSON TAZEWELL
WILL WINNEBAGO WOODFORD



AFFECTED COUNTIES:
IN ILLINOIS: BOONE, BUREAU, COOK, DEKALB, DUPAGE, FORD, FULTON, GRUNDY, HENRY, IROQUOIS, KANE, KANKAKEE, KENDALL, KNOX, LA SALLE, LAKE, LEE, LIVINGSTON, MARSHALL, MCHENRY, MCLEAN, OGLE, PEORIA, PUTNAM, STARK, STEPHENSON, TAZEWELL, WILL, WINNEBAGO, WOODFORD.

Summer officially arrives today at 12:16 p.m. After today, daylight hours will diminish.
For nearly six months, Chicago's days have been lengthening. The period of daylight has grown by more than 6 hours since Dec. 21. That's the date the winter season took hold and is the area's shortest day.
At 12:16 this afternoon, the sun will be visible farther above the horizon than at any other time of the year.
Chicagoans will be treated to 6 hours and 5 minutes more daylight Tuesday. The city is to be on the receiving end of a total of 15 hours and 13 minutes of daylight---more than six additional hours compared to six months ago when days were only 9 hours and 8 minutes long

HOT AND HUMID WEATHER WILL CONTINUE TO AFFECT NORTHERN ILLINOIS
AND NORTHWEST INDIANA THROUGH THIS EVENING. TEMPERATURES ARE
EXPECTED TO CLIMB INTO THE MID 90S AGAIN TODAY. THESE
TEMPERATURES...COMBINED WITH DEW POINTS IN THE MIDDLE TO UPPER 60S
WILL RESULT IN HEAT INDEX VALUES CLIMBING TO NEAR 100 DURING THE
AFTERNOON HOURS FOR THE CHICAGO METRO AREA...AND JUST ABOVE 100
FOR SURROUNDING AREAS. BECAUSE OF THE SOUTHWESTERLY WIND
COMPONENT...THIS DANGEROUS HEAT WILL ALSO IMPACT AREAS NEAR THE
LAKE.

COOLER CONDITIONS ARE EXPECTED BY WEDNESDAY NIGHT AND THURSDAY AS
A COLD FRONT MOVES ACROSS THE AREA.

THE COMBINATION OF HEAT AND HUMIDITY WILL CREATE A SITUATION IN
WHICH HEAT ILLNESSES ARE POSSIBLE. DRINK PLENTY OF FLUIDS...STAY
IN AN AIR-CONDITIONED ROOM...STAY OUT OF THE SUN...AND CHECK UP ON
RELATIVES AND NEIGHBORS.

CHILDREN AND PETS SHOULD NEVER BE LEFT UNATTENDED IN VEHICLES
UNDER ANY CIRCUMSTANCES. THIS IS ESPECIALLY TRUE DURING HOT
WEATHER WHEN THE CAR INTERIOR CAN REACH DANGEROUSLY HIGH
TEMPERATURES IN A MATTER OF MINUTES!

HOT AND HUMID WEATHER WILL CONTINUE TO AFFECT NORTHERN ILLINOIS
AND NORTHWEST INDIANA THROUGH WEDNESDAY. LITTLE RELIEF IS EXPECTED
OVERNIGHT AS LOWS WILL STAY IN THE MID TO UPPER 70S...TO RIGHT
AROUND 80 NEAR DOWNTOWN CHICAGO. TEMPERATURES ARE EXPECTED TO
CLIMB INTO THE MID 90S AGAIN ON WEDNESDAY. THESE TEMPERATURES...
COMBINED WITH DEW POINTS IN THE MIDDLE TO UPPER 60S WILL RESULT IN
HEAT INDEX VALUES CLIMBING ABOVE 100 DURING THE AFTERNOON HOURS.
BECAUSE OF THE SOUTHWESTERLY WIND COMPONENT...THIS DANGEROUS HEAT
WILL ALSO IMPACT AREAS NEAR THE LAKE.

COOLER CONDITIONS ARE EXPECTED BY WEDNESDAY NIGHT AND THURSDAY AS
A COLD FRONT MOVES ACROSS THE AREA.

THE COMBINATION OF HEAT AND HUMIDITY WILL CREATE A SITUATION IN
WHICH HEAT ILLNESSES ARE POSSIBLE. DRINK PLENTY OF FLUIDS...STAY
IN AN AIR-CONDITIONED ROOM...STAY OUT OF THE SUN...AND CHECK UP ON
RELATIVES AND NEIGHBORS.

CHILDREN AND PETS SHOULD NEVER BE LEFT UNATTENDED IN VEHICLES
UNDER ANY CIRCUMSTANCES. THIS IS ESPECIALLY TRUE DURING HOT
WEATHER WHEN THE CAR INTERIOR CAN REACH DANGEROUSLY HIGH
TEMPERATURES IN A MATTER OF MINUTES!

HIGH TEMPERATURES ON TUESDAY..

HERE ARE SOME SELECTED HIGH TEMPERATURES FROM AROUND THE AREA.

NORTHERN ILLINOIS
KANKAKEE.....................99
PEOTONE......................99
CHICAGO-NORTHERLY ISLAND.....97
WHEELING/PALWAUKEE...........97
CHICAGO-O'HARE...............96
ROCKFORD AIRPORT.............96
NWS CHICAGO-ROMEOVILLE.......96
CHICAGO-MIDWAY...............96
WAUKEGAN AIRPORT.............96
WEST CHICAGO.................95
AURORA/SUGAR GROVE...........95
JOLIET.......................95
LANSING......................95
DEKALB.......................93
PERU.........................93

NORTHWEST INDIANA
RENSSELAER...................97
VALPARAISO...................96

...HOT TEMPERATURES ACROSS NORTHERN ILLINOIS...

HIGHS TUESDAY AFTERNOON WERE IN THE MIDDLE AND UPPER 90S ACROSS THE
AREA...WHICH WILL LEAD TO VERY WARM TEMPERATURES TONIGHT. OVERNIGHT
LOWS ARE EXPECTED TO REMAIN IN THE MID TO UPPER 70S...WITH LOWER 80S
IN DOWNTOWN CHICAGO. HERE IS A LOOK AT THE RECORD MAXIMUM LOW
TEMPERATURES FOR JUNE 8TH AT CHICAGO AND ROCKFORD.

CHICAGO...77 IN 1933.
ROCKFORD...76 IN 1933.

WITH FORECAST HIGHS ON WEDNESDAY AGAIN IN THE MIDDLE AND UPPER
90S...HERE IS A LOOK AT RECORD HIGH TEMPERATURES FOR JUNE 8TH AT
CHICAGO AND ROCKFORD.

CHICAGO...97 IN 1933.
ROCKFORD...98 IN 1934.

THE HIGHEST OBSERVED HEAT INDEX TODAY ON NATIONAL WEATHER SERVICE
QUALITY CONTROLLED EQUIPMENT WAS 100 DEGREES AT NORTHERLY ISLAND IN
DOWNTOWN CHICAGO. HEAT INDEX VALUES MAY ONCE AGAIN APPROACH OR
EXCEED 100 DEGREES ON WEDNESDAY. EXTRA CAUTION IS ADVISED WHEN
ENGAGING IN OUTDOOR ACTIVITIES. WEAR LIGHT-COLORED LOOSE FITTING
CLOTHING AND DRINK PLENTY OF FLUIDS.

IT IS WORTH NOTING THAT LAST YEAR THE HIGHEST TEMPERATURE THAT
NORTHERLY ISLAND REACHED WAS 95 DEGREES ON JULY 23RD...THE HIGHEST
TEMPERATURE THAT OHARE REACHED WAS 94 ON JULY 23RD AND AUGUST
29TH...AND THE HIGHEST TEMPERATURE ROCKFORD REACHED WAS 92 ON JULY
14TH...AUGUST 29TH AND SEPTEMBER 21ST.

THE 97 DEGREES REACHED THUS FAR TODAY IS THE HIGHEST TEMPERATURE
RECORDED AT NORTHERLY ISLAND SINCE JULY 9TH 2007 WHEN IT REACHED
98 DEGREES.

THE 96 DEGREES REACHED THUS FAR TODAY IS THE HIGHEST TEMPERATURE
RECORDED AT OHARE AIRPORT SINCE AUGUST 2ND 2006 WHEN IT REACHED 97
DEGREES. JULY 31ST AND AUGUST 1ST 2006 BOTH REACHED 99 DEGREES. THE
96 DEGREES REACHED TODAY IS ACTUALLY THE SECOND HIGHEST TEMPERATURE
ON RECORD FOR JUNE 7TH. THE RECORD OF 100 DEGREES FOR THE DATE WAS
SET IN 1933.

THE 96 DEGREES REACHED THUS FAR TODAY AND THE 96 DEGREES REACHED
YESTERDAY ARE THE HIGHEST TEMPERATURES ROCKFORD AIRPORT RECORDED
SINCE JULY 31ST 2006 WHEN IT REACHED 96 DEGREES AS WELL. THE
RECORD HIGH FOR TODAY IS 97 DEGREES SET IN 1933.

..HOT TEMPERATURES ACROSS NORTHERN ILLINOIS...

WITH FORECAST HIGHS FOR TUESDAY AND WEDNESDAY AFTERNOON RANGING IN
THE MID TO UPPER 90S ACROSS NORTHERN ILLINOIS THE LOWS OVERNIGHT ARE
EXPECTED TO REMAIN IN THE MID TO UPPER 70S. HERE IS A LOOK AT THE
RECORD MAXIMUM LOW TEMPERATURES FOR JUNE 8TH AT CHICAGO AND ROCKFORD.

JUNE 8TH
CHICAGO...77 IN 1933.
ROCKFORD...76 IN 1933.

HEAT INDEX VALUES MAY APPROACH OR EXCEED 100 DEGREES ON BOTH DAYS.
EXTRA CAUTION IS ADVISED WHEN ENGAGING IN OUTDOOR ACTIVITIES. WEAR
LIGHT-COLORED LOOSE FITTING CLOTHING AND DRINK PLENTY OF FLUIDS.

IT IS WORTH NOTING THAT LAST YEAR THE HIGHEST TEMPERATURE THAT
NORTHERLY ISLAND REACHED WAS 95 DEGREES ON JULY 23RD...THE HIGHEST
TEMPERATURE THAT OHARE REACHED WAS 94 ON JULY 23RD AND AUGUST
29TH...AND THE HIGHEST TEMPERATURE ROCKFORD REACHED WAS 92 ON JULY
14TH...AUGUST 29TH AND SEPTEMBER 21ST.

THE 97 DEGREES REACHED THUS FAR TODAY IS THE HIGHEST TEMPERATURE
RECORDED AT NORTHERLY ISLAND SINCE JULY 9TH 2007 WHEN IT REACHED
98 DEGREES.

THE 95 DEGREES REACHED THUS FAR TODAY IS THE HIGHEST TEMPERATURE
RECORDED AT OHARE AIRPORT SINCE AUGUST 1ST 2006 WHEN IT REACHED 99
DEGREES.

THE 96 DEGREES REACHED THUS FAR TODAY AND THE 96 DEGREES REACHED
YESTERDAY ARE THE HIGHEST TEMPERATURES ROCKFORD AIRPORT RECORDED
SINCE JULY 31ST 2006 WHEN IT REACHED 96 DEGREES AS WELL. THE
RECORD HIGH FOR TODAY IS 97 DEGREES SET IN 1933.

HOT AND HUMID WEATHER TO CONTINUE THROUGH WEDNESDAY...

HOT AND HUMID WEATHER WILL CONTINUE TO AFFECT NORTHERN ILLINOIS
AND NORTHWEST INDIANA THROUGH WEDNESDAY. TEMPERATURES WILL BE IN
THE MID 90S THIS AFTERNOON AND AGAIN ON WEDNESDAY. THESE
TEMPERATURES...COMBINED WITH DEW POINTS IN THE MID TO UPPER 60S
WILL RESULT IN HEAT INDICES OF AROUND 100 DURING THE THIS AFTERNOON
AND WEDNESDAY AFTERNOON. SOUTHWEST WINDS WILL BE STRONG ENOUGH TO
PREVENT ANY LAKE BREEZE DEVELOPMENT TODAY OR WEDNESDAY...SO ALL
AREAS...EVEN RIGHT AT THE LAKE SHORE...WILL EXPERIENCE THE HOT AND
HUMID CONDITIONS.

LITTLE RELIEF IS EXPECTED TONIGHT...AS TEMPERATURES ARE EXPECTED
TO REMAIN IN THE MID AND UPPER 70S IN MANY AREAS...AND ARE LIKELY TO
REMAIN AROUND 80 IN THE HIGHLY URBANIZED AREAS OF CHICAGO.

COOLER CONDITIONS ARE EXPECTED BY WEDNESDAY NIGHT AND THURSDAY AS A
COLD FRONT MOVES ACROSS THE AREA.

THE COMBINATION OF HEAT AND HUMIDITY WILL CREATE A SITUATION IN
WHICH HEAT ILLNESSES ARE POSSIBLE FOR THOSE NOT ACCUSTOMED TO THE
HEAT...THE INFIRM AND THOSE THAT WILL BE WORKING STRENUOUSLY
OUTSIDE DRINK PLENTY OF FLUIDS...STAY IN AN AIR-CONDITIONED
ROOM...STAY OUT OF THE SUN...TAKE FREQUENT BREAKS DURING OUTSIDE
WORK. CHECK UP ON RELATIVES AND NEIGHBORS WITHOUT AIR CONDITIONING.

CHILDREN AND PETS SHOULD NEVER BE LEFT UNATTENDED IN VEHICLES
UNDER ANY CIRCUMSTANCES. THIS IS ESPECIALLY TRUE DURING HOT
WEATHER WHEN THE CAR INTERIOR CAN REACH DANGEROUSLY HIGH
TEMPERATURES IN A MATTER OF MINUTES.

..HOT AND HUMID WEATHER TO CONTINUE THROUGH WEDNESDAY...

HOT AND HUMID WEATHER WILL CONTINUE TO AFFECT NORTHERN ILLINOIS
AND NORTHWEST INDIANA THROUGH WEDNESDAY. TEMPERATURES ARE EXPECTED
TO CLIMB INTO THE MID AND UPPER 90S THIS AFTERNOON...AND INTO THE
MID 90S AGAIN ON WEDNESDAY. THESE TEMPERATURES...COMBINED WITH
DEW POINTS IN THE MIDDLE TO UPPER 60S WILL RESULT IN HEAT INDICES
CLIMBING ABOVE 100 DURING THE AFTERNOON HOURS. BECAUSE OF THE
SOUTHWESTERLY WIND COMPONENT...THIS DANGEROUS HEAT WILL ALSO
IMPACT AREAS NEAR THE LAKE.

LITTLE RELIEF IS EXPECTED TONIGHT...AS TEMPERATURES ARE EXPECTED
TO REMAIN IN THE MID AND UPPER 70S IN MANY AREAS AND ARE LIKELY TO
REMAIN AROUND 80 IN THE MORE URBANIZED AREAS OF CHICAGO. COOLER
CONDITIONS ARE EXPECTED BY WEDNESDAY NIGHT AND THURSDAY AS A COLD
FRONT MOVES ACROSS THE AREA.

THE COMBINATION OF HEAT AND HUMIDITY WILL CREATE A SITUATION IN
WHICH HEAT ILLNESSES ARE POSSIBLE. DRINK PLENTY OF FLUIDS...STAY
IN AN AIR-CONDITIONED ROOM...STAY OUT OF THE SUN...AND CHECK UP ON
RELATIVES AND NEIGHBORS.

CHILDREN AND PETS SHOULD NEVER BE LEFT UNATTENDED IN VEHICLES
UNDER ANY CIRCUMSTANCES. THIS IS ESPECIALLY TRUE DURING HOT
WEATHER WHEN THE CAR INTERIOR CAN REACH DANGEROUSLY HIGH
TEMPERATURES IN A MATTER OF MINUTES!

..DANGEROUS HEAT EXPECTED ON TUESDAY INTO WEDNESDAY...

AN UNSEASONABLY WARM AND MOIST ATMOSPHERE WILL CONTINUE TO TAKE A
FIRM GRIP OF THE AREA ON TUESDAY AND WEDNESDAY. TEMPERATURES WILL
LIKELY CLIMB INTO THE MIDDLE TO UPPER 90S ACROSS NORTHERN ILLINOIS
AND NORTHWESTERN INDIANA ON TUESDAY. THESE TEMPERATURES...COMBINED
WITH DEW POINTS IN THE MIDDLE TO UPPER 60S WILL RESULT IN HEAT
INDICES CLIMBING ABOVE 100 DURING THE AFTERNOON HOURS. BECAUSE OF
THE SOUTHWESTERLY WIND COMPONENT...THIS DANGEROUS HEAT WILL ALSO
IMPACT AREAS NEAR THE LAKE. LITTLE RELIEF IS EXPECTED AT
NIGHT...ESPECIALLY IN URBAN AREAS...AS TEMPERATURES WILL LIKELY
REMAIN IN THE UPPER 70S TO NEAR 80 FOR OVERNIGHT LOWS. THIS
DANGEROUS HEAT WILL CONTINUE ON WEDNESDAY AS HEAT INDICES AGAIN
CLIMB TO 100 TO 105. COOLER CONDITIONS ARE EXPECTED BY WEDNESDAY
NIGHT AND THURSDAY AS A COLD FRONT MOVES ACROSS THE AREA.

THE COMBINATION OF HIGH TEMPERATURES AND HUMIDITY WILL CREATE A
SITUATION IN WHICH HEAT ILLNESSES ARE POSSIBLE. DRINK PLENTY OF
FLUIDS...STAY IN AN AIR-CONDITIONED ROOM...STAY OUT OF THE
SUN...AND CHECK UP ON RELATIVES AND NEIGHBORS.

CHILDREN AND PETS SHOULD NEVER BE LEFT UNATTENDED IN VEHICLES
UNDER ANY CIRCUMSTANCES. THIS IS ESPECIALLY TRUE DURING HOT
WEATHER WHEN THE CAR INTERIOR CAN REACH DANGEROUSLY HIGH
TEMPERATURES IN A MATTER OF MINUTES!

..HOT AND HUMID WEATHER THROUGH WEDNESDAY...

WITH FORECAST HIGH TEMPERATURES IN THE MIDDLE 90S ON BOTH TUESDAY
AND WEDNESDAY...HERE IS A LOOK AT RECORD HIGH TEMPERATURES FOR
JUNE 7TH AND JUNE 8TH AT CHICAGO AND ROCKFORD.

JUNE 7TH
CHICAGO...100 IN 1933.
ROCKFORD...97 IN 1933.

JUNE 8TH
CHICAGO....97 IN 1933.
ROCKFORD...98 IN 1934.

HEAT INDEX VALUES MAY APPROACH OR EXCEED 100 DEGREES ON BOTH DAYS.
EXTRA CAUTION IS ADVISED WHEN ENGAGING IN OUTDOOR ACTIVITIES. WEAR
LIGHT-COLORED LOOSE FITTING CLOTHING AND DRINK PLENTY OF FLUIDS.

THE NATIONAL WEATHER SERVICE HAS CANCELLED SEVERE THUNDERSTORM
WATCH 432 FOR THE FOLLOWING AREAS

IN ILLINOIS THIS CANCELS 3 COUNTIES

IN NORTH CENTRAL ILLINOIS

BOONE

IN NORTHEAST ILLINOIS

LAKE IL MCHENRY

THIS INCLUDES THE CITIES OF...BELVIDERE...WAUKEGAN AND WOODSTOCK.

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
432 IN EFFECT UNTIL NOON CDT TODAY FOR THE FOLLOWING AREAS

IN ILLINOIS THIS WATCH INCLUDES 3 COUNTIES

IN NORTH CENTRAL ILLINOIS

BOONE

IN NORTHEAST ILLINOIS

LAKE IL MCHENRY

THIS INCLUDES THE CITIES OF...BELVIDERE...WAUKEGAN AND WOODSTOCK.

HOT AND HUMID WEATHER IS EXPECTED TUESDAY WITH TEMPERATURES
POSSIBLY REACHING THE MIDDLE 90S AND AFTERNOON HEAT INDICES
REACHING 100 TO 105 DEGREES.

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL COOK COUNTY IN NORTHEAST ILLINOIS...

* UNTIL 445 PM CDT

* AT 342 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...
AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED
NEAR OAK PARK...AND MOVING SOUTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
CICERO...STICKNEY...HUMBOLDT PARK AND FOREST VIEW AROUND 350 PM
CDT.
MIDWAY AIRPORT AROUND 355 PM CDT.
DOUGLAS PARK...CHICAGO AND NAVY PIER AROUND 400 PM CDT.
BRIDGEPORT...NORTHERLY ISLAND AND ENGLEWOOD AROUND 405 PM CDT.
HYDE PARK AROUND 415 PM CDT.
CHATHAM AROUND 420 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE SOUTH
CHICAGO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

..STRONG THUNDERSTORMS OVER NORTHERN COOK COUNTY...

AT 323 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED TWO
INTENSE THUNDERSTORMS ONE NEAR MOUNT PROSPECT AND THE OTHER NEAR
BENSENVILLE...BOTH MOVING EAST AT 25 MPH.

NICKEL SIZE HAIL...WINDS UP TO 50 MPH...CONTINUOUS CLOUD TO GROUND
LIGHTNING...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...SCHILLER PARK...ROSEMONT...AND RIVER
GROVE AROUND 330 PM...PARK RIDGE...NORRIDGE...AND HARWOOD HEIGHTS
AROUND 335 PM...GLENVIEW AND NILES AROUND 340 PM.

THESE STORMS WILL APPROACH THE LAKE FRONT BY 345 PM...ANYONE OUT ON
THE NORTHERN COOK COUNTY BEACHES SHOULD SEEK SHELTER IMMEDIATELY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE
OBJECTS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS
TREES. HEAVY RAINFALL 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.

SEVERE THUNDERSTORM WATCH 426 IS IN EFFECT UNTIL 900 PM CDT
FOR THE FOLLOWING LOCATIONS

COUNTY SPECIFIC MESSAGE:

/O.NEW.KWNS.SV.A.0426.110604T1910Z-110605T0200Z/

IL
. ILLINOIS COUNTIES INCLUDED ARE

COOK DE KALB DUPAGE
FORD GRUNDY IROQUOIS
KANE KANKAKEE KENDALL
LA SALLE LIVINGSTON WILL

AFFECTED COUNTIES:
IN ILLINOIS: COOK, DEKALB, DUPAGE, FORD, GRUNDY, IROQUOIS, KANE, KANKAKEE, KENDALL, LA SALLE, LIVINGSTON, WILL.

THERE IS A GOOD CHANCE OF THUNDERSTORMS ACROSS THE OUTLOOK AREA
ON SATURDAY. SOME OF THESE STORMS COULD BE SEVERE...PARTICULARLY
IN THE LATE MORNING AND AFTERNOON HOURS WITH LARGE HAIL AND
DAMAGING STRAIGHT LINE WINDS BEING THE PRIMARY SEVERE THREATS.
THUNDERSTORMS MAY LINGER SOUTH OF INTERSTATE 80 SATURDAY EVENING.

IN ADDITION TO THE SEVERE THREAT...THESE THUNDERSTORMS WILL OCCUR
WITHIN A VERY WARM AND MOIST ATMOSPHERE. THIS WILL LEAD TO VERY
EFFICIENT RAINFALL PRODUCTION...AND THUS WILL INCREASE THE THREAT
FOR HEAVY RAINFALL DURING THE DAY ON SATURDAY.

THERE WILL BE PERIODIC CHANCES OF THUNDERSTORMS MONDAY...AND
AGAIN TUESDAY NIGHT THROUGH THURSDAY.

...A LOOK BACK AT THE CLIMATE FOR SPRING 2011 FOR CHICAGO AND
ROCKFORD...

AT CHICAGO...THE AVERAGE HIGH TEMPERATURE FOR THE SEASON WAS 55.9
DEGREES WHICH IS 2.1 DEGREES BELOW THE 1971 TO 2000 AVERAGE. THE
AVERAGE LOW TEMPERATURE WAS 38.7 DEGREES WHICH IS 0.8 DEGREES ABOVE
THE 1971 TO 2000 AVERAGE. OVERALL...THE AVERAGE TEMPERATURE
FOR THE SEASON WAS 47.3 DEGREES WHICH IS 0.6 DEGREES BELOW NORMAL.

A TOTAL OF 14.79 INCHES OF PRECIPITATION WAS RECORDED DURING THIS
PAST SPRING...WHICH IS 5.08 INCHES ABOVE NORMAL. THIS RANKS AS
BEING THE 6TH WETTEST SPRING ON RECORD IN CHICAGO DATING BACK TO
1871. ROUGHLY HALF OF THIS 14.79 INCHES...OR 7.27 INCHES...WAS
RECORDED DURING THE MONTH OF MAY. THIS RANKED THE MONTH OF MAY AS
THE 3RD WETTEST ON RECORD. THERE WAS ALSO A TOTAL OF 1.6 INCHES OF
SNOW THAT WAS RECORDED AT OHARE IN MARCH AND APRIL.


AT ROCKFORD...THE AVERAGE HIGH TEMPERATURE WAS 58.1 DEGREES WHICH IS
0.5 DEGREES BELOW NORMAL. THE AVERAGE LOW TEMPERATURE WAS 39.2
DEGREES WHICH IS 2.1 DEGREES ABOVE NORMAL. OVERALL...THE AVERAGE
TEMPERATURE FOR THE SEASON WAS 48.6 DEGREES WHICH IS 0.7 DEGREES
ABOVE NORMAL.

A TOTAL OF 10.75 INCHES OF PRECIPITATION WAS RECORDED DURING THIS
PAST SPRING...WHICH WAS ONLY 0.71 INCHES ABOVE NORMAL. IN
ADDITION...A TOTAL OF 0.1 INCHES OF SNOW WAS REPORTED.

THERE IS A CHANCE OF THUNDERSTORMS ON THURSDAY. THERE WILL BE
ANOTHER SLIGHT CHANCE OF THUNDERSTORMS SATURDAY...AND THEN AGAIN
MONDAY INTO TUESDAY.

...A LOOK BACK AT THE CLIMATE FOR THE MONTH OF MAY 2011 FOR
CHICAGO AND ROCKFORD...

AT CHICAGO...THE AVERAGE HIGH TEMPERATURE WAS 67.8 DEGREES WHICH IS
2.1 DEGREES BELOW NORMAL. THE AVERAGE LOW TEMPERATURE WAS 48.0
DEGREES WHICH IS 0.5 DEGREE ABOVE NORMAL. THE AVERAGE TEMPERATURE
FOR THE MONTH WAS 57.9 DEGREES WHICH IS 0.8 DEGREES BELOW NORMAL.
7.27 INCHES OF PRECIPITATION WAS RECORDED WHICH IS 3.89 INCHES ABOVE
NORMAL. A TRACE OF SNOW...IN THE FORM OF HAIL...WAS RECORDED WHICH
IS NORMAL.

THE HIGH OF 90 DEGREES ON MAY 10 SET A RECORD HIGH FOR THAT
DAY...BREAKING THE OLD RECORD OF 89 SET IN 1896. ALSO...MAY 2011 IS
THE FOURTH WETTEST MAY ON RECORD.

AT ROCKFORD...THE AVERAGE HIGH TEMPERATURE WAS 70.4 DEGREES WHICH
IS 0.8 DEGREES BELOW NORMAL. THE AVERAGE LOW TEMPERATURE WAS 48.9
DEGREES WHICH IS 1.0 DEGREE ABOVE NORMAL. THE AVERAGE TEMPERATURE
FOR THE MONTH WAS 59.7 DEGREES WHICH IS 0.1 DEGREE ABOVE NORMAL.
3.94 INCHES OF PRECIPITATION WAS RECORDED WHICH IS 0.09 INCHES BELOW
NORMAL. A TRACE OF SNOW...IN THE FORM OF HAIL...WAS RECORDED WHICH
IS NORMAL.

THE HIGH TEMPERATURE OF 91 DEGREES ON MAY 10 TIED THE RECORD FOR
THAT DAY SET IN 1922.
THE HIGH TEMPERATURE OF 91 DEGREES ON MAY 11 BROKE THE OLD RECORD OF
90 FOR THAT DAY SET IN 1922.