Tornadoes and Flooding in Illinois, June 21, 2011

Name: Tornadoes and Flooding in Illinois, June 21, 2011
Start: 2011-06-21T17:50
End: 2011-06-21T23:00
Location: Illinois

June 21, 2011 · NWS LOT · 80 events in 9 counties and zones

A powerful line of severe thunderstorms moved northeast across northern Illinois during the evening hours of June 21st producing damaging winds and widespread wind damage.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 2
Property damage: $2.5 million
Crop damage: None recorded
Events: 80

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS LOT wrote it up.

A powerful line of severe thunderstorms moved northeast across northern Illinois during the evening hours of June 21st producing damaging winds and widespread wind damage.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Chicago, IL wrote its last area forecast discussion before the first event at Jun 21, 4:15 PM CST, 1 hour 35 minutes earlier.

Area forecast discussion, Jun 21, 4:15 PM CST, 1 hour 35 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
515 PM CDT TUE JUN 21 2011

.MESOSCALE DISCUSSION...
515 PM CDT...

CLOSELY WATCHING MINI-SUPERCELL OVER BOONE COUNTY. ROTATION ON RADAR
THUS FAR HAS BEEN MAINLY CONFINED TO MID LEVELS...HOWEVER
ENVIRONMENTAL CONDITIONS NOT UNFAVORABLE FOR TIGHTENING OF THE
MESOCYCLONE AND EVEN A TORNADO. CORE OF THE UPDRAFT FAIRLY LOW SO
HAIL THREAT AT THIS POINT IS STILL LOW SO NOT PLANNING AN AVR AT
THIS TIME. VERY LOW LCL HEIGHTS AND MODERATE LOW LEVEL SHEAR DOES
RAISE SOME CONCERN FOR STORM TO BECOME TORNADIC BEFORE CROSSING INTO
WISCONSIN AND WILL CONTINUE TO CLOSELY MONITOR FOR ANY SIGNS OF
INTENSIFICATION.

IZZI

404 PM CDT...
CLUSTER OF ELEVATED THUNDERSTORMS THAT MOVED ACROSS NORTHERN
ILLINOIS EARLIER FINALLY DID BECOME ROOTED IN THE BOUNDARY LAYER AND
BECAME SEVERE...BUT WAITING UNTIL CROSSING THE CHEDDAR CURTAIN INTO
WISCONSIN.

CIRRUS CANOPY DOES BLANKET MUCH OF THE CWA...BUT DESPITE THE CIRRUS
CAN SEE WHAT APPEARS TO BE SFC BASED CUMULUS DEVELOPING OVER
ESPECIALLY SOUTHERN AND WESTERN PORTIONS OF THE CWA. IN
ADDITION...WATER VAPOR IMAGERY SHOWS THAT THE SHORTWAVE TROUGH OVER
MISSOURI THAT WE'VE BEEN EYEING ALL DAY IS MOVING INTO WESTERN
ILLINOIS. ACARS SOUNDINGS OUT OF KSTL AT 1800 UTC AND ABOUT AN HOUR
AND A HALF LATER SHOW EVIDENCE OF SOME SYNOPTIC SCALE ASCENT WITH
COOLING/MOISTENING IN THE 900-800MB LAYER. CONTINUED LOW LEVEL MOIST
ADVECTION COMBINED WITH SOME ADDED SYNOPTIC SCALE ASCENT SHOULD BE
ENOUGH TO ALLOW ATMOSPHERE TO RECOVER FROM THE EARLY AFTERNOON
ELEVATED STORMS WITH MLCAPES POSSIBLY NEARING 2000 J/KG AGAIN BEFORE
THE AFTERNOON IS OUT OVER OUR WESTERN CWA.

SURFACE ANALYSIS SHOWS INTENSIFYING SURFACE MOISTURE CONVERGENCE
OVER WESTERN ILLINOIS CORRESPONDING TO EASTWARD MOVING WEAK COLD
FRONT. HAVE SEEN A RECENT UPTICK IN CONVECTIVE DEVELOPMENT IN THIS
REGION FROM NORTH OF STL TO NEAR GBG. ITS UNCLEAR WHETHER ATMOSPHERE
WILL DESTABILIZE SUFFICIENTLY FOR THESE STORMS TO BECOME
SEVERE...BUT AT THIS POINT THEY APPEAR TO BE THE PRIME POTENTIAL
CANDIDATES FOR MOST OF THE CWA. SHOULD DEEP AND SUSTAINED CONVECTION
FORM HERE DEEP LAYER SHEAR REMAINS SUPPORTIVE OF ORGANIZED AND
POSSIBLY EVEN SUPERCELLULAR STORMS WITH POTENTIAL FOR LARGE HAIL AND
DAMAGING WINDS...WITH FAIRLY IMPRESSIVE DEEP LAYER SHEAR.

ELSEWHERE...ISOLATED THUNDERSTORMS ARE DEVELOPING OVER SOUTHEAST CWA
AND WITH VERY STRONG INSTABILITY IN THIS AREA SOME SEVERE POTENTIAL
COULD EXISTS DESPITE THE SOMEWHAT LESSER INSTABILITY. FINALLY...BOW
ECHO EAST OF STL COULD THREATEN OUR EXTREME SE CWA IN A FEW HOURS IF
IT MAINTAINS ITSELF.

SEVERE POTENTIAL IS NOT TREMENDOUS...BUT CERTAINLY DOES EXIST AND
WILL REQUIRE CLOSE MONITORING.

IZZI

.DISCUSSION...
351 PM CDT

OVERNIGHT THROUGH LATE WEEK...

UPPER LOW ON THE SD-MN BORDER WILL CONTINUE TO BE THE MAIN FEATURE
CONTROLLING THE WEATHER ACROSS THE LOCAL AREA THROUGH FRI.

WHILE IT HAS LIFTED NORTH-NORTHEASTWARD FROM FROM FAR
NORTHEASTERN NE DURING THIS MORNING AND EARLY THIS AFTERNOON IT
WILL TURN TO THE EAST OVERNIGHT AS IT COMES UNDER THE INFLUENCE OF
THE PAIR OF CANADIAN UPPER LOWS OVER NORTHERN HUDSON BAY AND NEW
FOUNDLAND. AFTER CURVING TO THE EAST TONIGHT THE UPPER MIDWEST
UPPER LOW SLOWLY MOVES ACROSS WI WED AND WED NIGHT...THEN THE
WESTERN AND CENTRAL GREAT LAKES ON THU.

SHORT WAVES/DISTURBANCES WILL PERIODICALLY ROTATE AROUND THE UPPER
LOW AND ACROSS THE FORECAST AREA THOUGH EXACT TIMING QUESTIONABLE
BEYOND TONIGHT. DAYTIME HEATING NOW THAT WE ARE AT THE LONGEST
DAYS OF THE YEAR WILL LIKELY FAVOR MOST COVERAGE/GREATEST THREAT
OF THUNDERSTORMS WILL BE DURING THE AFTERNOONS AND EVENINGS OF WED
AND THU.

WHILE THE UPPER LOW IS PROGGED TO BE OVER SOUTHERN ONTARIO BY FRI
MODELS DO SHOW A COLD FRONT LINGERING BACK ACROSS THE AREA UNDER
CYCLONIC FLOW SHOW HAVE HELD ON TO A SLIGHT CHANCE OF SHOWERS FOR
THE DAYTIME ON FRI. COOLER AIR STARTS TO SPREAD ACROSS THE AREA
FRI ON THE BACK SIDE OF THE SYSTEM AS IT GRADUALLY WORKS ITS WAY
EASTWARD OVER THE GREAT LAKES.

HIGH PRESSURE BUILDING FROM CENTRAL CANADA AND THE NORTHERN PLAINS
LATER FRI AND FRI NIGHT WILL RESULT IN MOSTLY CLEAR AND DRY
CONDITIONS FOR THE LOCAL AREA AS THE CENTER OF THE ANTICYCLONE
SETTLES OVER THE UPPER GREAT LAKES. THIS HIGH WILL ALSO KEEP THE
REFRESHINGLY COOL TEMPERATURES OVER THE AREA THROUGH THE
WEEKEND...WITH SOME HELP OF WEAK DAY-TIME LAKE BREEZES.

TRS

&&

.DISCUSSION...
351 PM CDT

OVERNIGHT THROUGH LATE WEEK...

UPPER LOW ON THE SD-MN BORDER WILL CONTINUE TO BE THE MAIN FEATURE
CONTROLLING THE WEATHER ACROSS THE LOCAL AREA THROUGH FRI.

WHILE IT HAS LIFTED NORTH-NORTHEASTWARD FROM FROM FAR
NORTHEASTERN NE DURING THIS MORNING AND EARLY THIS AFTERNOON IT
WILL TURN TO THE EAST OVERNIGHT AS IT COMES UNDER THE INFLUENCE OF
THE PAIR OF CANADIAN UPPER LOWS OVER NORTHERN HUDSON BAY AND NEW
FOUNDLAND. AFTER CURVING TO THE EAST TONIGHT THE UPPER MIDWEST
UPPER LOW SLOWLY MOVES ACROSS WI WED AND WED NIGHT...THEN THE
WESTERN AND CENTRAL GREAT LAKES ON THU.

SHORT WAVES/DISTURBANCES WILL PERIODICALLY ROTATE AROUND THE UPPER
LOW AND ACROSS THE FORECAST AREA THOUGH EXACT TIMING QUESTIONABLE
BEYOND TONIGHT. DAYTIME HEATING NOW THAT WE ARE AT THE LONGEST
DAYS OF THE YEAR WILL LIKELY FAVOR MOST COVERAGE/GREATEST THREAT
OF THUNDERSTORMS WILL BE DURING THE AFTERNOONS AND EVENINGS OF WED
AND THU.

WHILE THE UPPER LOW IS PROGGED TO BE OVER SOUTHERN ONTARIO BY FRI
MODELS DO SHOW A COLD FRONT LINGERING BACK ACROSS THE AREA UNDER
CYCLONIC FLOW SHOW HAVE HELD ON TO A SLIGHT CHANCE OF SHOWERS FOR
THE DAYTIME ON FRI. COOLER AIR STARTS TO SPREAD ACROSS THE AREA
FRI ON THE BACK SIDE OF THE SYSTEM AS IT GRADUALLY WORKS ITS WAY
EASTWARD OVER THE GREAT LAKES.

HIGH PRESSURE BUILDING FROM CENTRAL CANADA AND THE NORTHERN PLAINS
LATER FRI AND FRI NIGHT WILL RESULT IN MOSTLY CLEAR AND DRY
CONDITIONS FOR THE LOCAL AREA AS THE CENTER OF THE ANTICYCLONE
SETTLES OVER THE UPPER GREAT LAKES. THIS HIGH WILL ALSO KEEP THE
REFRESHINGLY COOL TEMPERATURES OVER THE AREA THROUGH THE
WEEKEND...WITH SOME HELP OF WEAK DAY-TIME LAKE BREEZES.

TRS

&&

.AVIATION...

//ORD AND MDW CONCERNS...UPDATED 22Z...

* CONVECTIVE TIMING/COVERAGE THIS AFTERNOON/EVENING.
* GUSTY SOUTH WINDS.
* POTENTIAL FOR MVFR CIGS OVERNIGHT INTO WEDNESDAY MORNING.

BMD

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

UPDATE 20Z...LOOKING LIKE THERE WILL BE A LULL IN THE ACTION AFTER
THIS FIRST BATCH OF SHRA/TSRA HAS MOVED OUT OF THE TERMINALS AREA.
REMOVED THE TEMPO GROUPS FOR TS UNTIL TIMING BECOMES MORE OBVIOUS.

PREVIOUS DISCUSSION
SOUTHERLY FLOW OF MOIST UNSTABLE AIR CONTINUING THIS AFTERNOON.
APPROACHING UPPER LEVEL WAVE WILL PROVIDE LIFT. TSRA DEVELOPING
OVER WESTERN IL WILL SPREAD INTO THE TERMINAL AREAS BY 19Z-20Z.
THEN TSRA CONTINUING INTO THE EVENING HOURS.

WITH AMPLE LOW LEVEL MOISTURE IN PLACE THERE IS POTENTIAL FOR
MVFR CIGS DEVELOPING IN THE OVERNIGHT HOURS AND PERSISTING INTO
WEDNESDAY MORNING.

PAW

//ORD AND MDW CONFIDENCE...UPDATED 22Z...

* LOW TO MEDIUM CONFIDENCE TIMING/COVERAGE TSRA.
* MEDIUM TO HIGH CONFIDENCE IN WIND FORECAST.
* MEDIUM CONFIDENCE IN MVFR CIGS OVERNIGHT/WEDNESDAY MORNING.

BMD

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

 * WEDNESDAY NIGHT...CHC SHRA...MVFR CIGS POSSIBLE.
 * THURSDAY...MVFR CIGS. CHANCE OF SHRA.
 * FRIDAY...VFR.
 * SATURDAY...VFR.
 * SUNDAY...VFR. CHANCE TS...MVFR CIGS POSSIBLE.
 * MONDAY...VFR. CHANCE TS...MVFR CIGS POSSIBLE.

SHEA

&&

.MARINE...
159 PM CDT

LOW PRESSURE ACROSS IOWA WILL CONTINUE TO BE THE PRIMARY WEATHER
MAKER FOR THE NEXT SEVERAL DAYS AS IT SLOWLY LIFTS EAST
NORTHEASTWARD ACROSS THE UPPER MISSISSIPPI VALLEY AND
ACROSS THE WESTERN GREAT LAKES BY LATE THIS WEEK. A WARM FRONT
...ASSOCIATED WITH THIS LOW...WILL SLOWLY LIFT NORTHWARD ACROSS LAKE
MICHIGAN DURING THIS PERIOD. WINDS WILL REMAIN SOUTH TO
SOUTHWESTERLY TO THE SOUTH OF THE WARM FRONT AND EASTERLY TO THE
NORTH. EASTERLY WINDS ACROSS THE FAR NORTHERN SECTION OF THE LAKE
WILL CONTINUE AROUND 25 KT TONIGHT. HOWEVER...AS THE LOW APPROACHES
AND MOVES OVERHEAD LATE WEDNESDAY AND THURSDAY THE WINDS WILL BECOME
LIGHT AND VARIABLE ACROSS THE NORTH. WINDS WILL ALSO BE INCREASING
OUT OF THE SOUTHWEST ACROSS THE FAR SOUTHERN SECTION OF LAKE
MICHIGAN ON WEDNESDAY IN RESPONSE TO THE APPROACHING SURFACE LOW.
THE
OFFSHORE COMPONENT TO THE WINDS WILL LIKELY PRESENT THE ILLINOIS AND
INDIANA NEAR-SHORE WATERS WITH THE HIGHEST WINDS. THESE WINDS COULD
BE NEAR SMALL CRAFT CRITERIA.

THUNDERSTORMS ARE EXPECTED TO BECOME MORE WIDESPREAD THIS AFTERNOON
AND EVENING.  THEREFORE...A FEW PERIODS OF STORMS WILL LIKELY AFFECT
MUCH OF LAKE MICHIGAN THROUGH WEDNESDAY.

HIGH PRESSURE WILL SETTLE OVER THE LAKE THIS WEEKEND. THIS WILL
BRING A PERIOD OF LIGHT AND VARIABLE WINDS INTO EARLY NEXT WEEK.

KJB

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...NONE.
&&

Hazardous weather outlook, Jun 21, 3:20 PM CST, 2 hours 30 minutes before

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
420 PM CDT TUE JUN 21 2011

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
222130-
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-
420 PM CDT TUE JUN 21 2011 /520 PM EDT TUE JUN 21 2011/

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

.DAY ONE...TONIGHT.

WEATHER HAZARDS EXPECTED:

SCATTERED THUNDERSTORMS...A FEW OF THE STRONGER STORMS MAY
PRODUCE:

DAMAGING WINDS...LARGE HAIL...FREQUENT LIGHTNING...HEAVY
DOWNPOURS.

AREAS AFFECTED AND TIMING:

THUNDERSTORMS WILL BECOME MORE NUMEROUS ACROSS NORTH CENTRAL AND
NORTHEAST ILLINOIS AS WELL AS NORTHWEST INDIANA DURING THE LATE
AFTERNOON AND EARLY EVENING. ADDITIONAL THUNDERSTORMS WILL MOVE
ACROSS NORTHWEST ILLINOIS AND NORTHWEST INDIANA DURING THE MID
EVENING HOURS.

DISCUSSION:

ADDITIONAL THUNDERSTORMS WILL CONTINUE TO DEVELOP IN CENTRAL AND
NORTHERN ILLINOIS AS WELL AS NORTHWEST INDIANA LATE THIS AFTERNOON
AND EARLY THIS EVENING...AND WILL BE MOVING NORTH-NORTHEAST ACROSS
THE OUTLOOK AREA. THUNDERSTORMS IN SOUTHWEST ILLINOIS LATE THIS
AFTERNOON WILL MOVE INTO NORTHEAST ILLINOIS AND NORTHWEST INDIANA
DURING THE MID EVENING HOURS. STORMS HAVE BEEN...AND WILL CONTINUE
TO MOVE AT A RATHER QUICK SPEED SO WHILE BRIEF HEAVY DOWNPOURS MAY
OCCUR ONLY LOCALIZED FLOODING OF POOR DRAINAGE AND LOW-LYING AREA
ARE EXPECTED THIS EVENING.

PORTIONS OF THE KANKAKEE AND ILLINOIS RIVERS WILL REMAIN IN
FLOOD.

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

THERE IS A CHANCE OF THUNDERSTORMS MONDAY.

PORTIONS OF THE KANKAKEE AND ILLINOIS RIVERS WILL REMAIN IN FLOOD.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING.

&&

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

LMZ740>745-222130-
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-
420 PM CDT TUE JUN 21 2011

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

.DAY ONE...TONIGHT.

THUNDERSTORMS ARE LIKELY THIS EVENING. ANY THUNDERSTORM IS
DANGEROUS DUE TO LIGHTNING. SOME STORMS MAY BE STRONG THIS
WEEKEND...WITH A FEW CAPABLE OF PRODUCING WIND GUSTS OF 35
TO 50 KT.

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

THERE IS A CHANCE OF THUNDERSTORMS MONDAY.

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-
870-872-874-876-878-222130-
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-
420 PM CDT TUE JUN 21 2011

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

.DAY ONE...TONIGHT.

THUNDERSTORMS ARE LIKELY. ANY THUNDERSTORM IS DANGEROUS DUE TO
LIGHTNING. A FEW OF THE STRONGER STORMS COULD PRODUCE WIND GUSTS
OF 35 TO 50 KT.

THERE WILL BE AREAS OF FOG AND REDUCED VISIBILITY ON NORTHERN AND
CENTRAL PORTIONS OF THE LAKE.

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

THERE ARE PERIODIC CHANCES FOR THUNDERSTORMS WEDNESDAY AND
THURSDAY...MAINLY ON THE NORTHERN AND CENTRAL SECTIONS OF THE
LAKE.

THERE IS A CHANCE OF THUNDERSTORMS ACROSS ALL OF THE LAKE MONDAY.

&&

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

In the hours before

Local storm report, Jun 21, 1:34 PM CST, 4 hours 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
234 PM CDT TUE JUN 21 2011

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

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

&&

IZZI

Special weather statement, Jun 21, 4:58 PM CST, 52 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
558 PM CDT TUE JUN 21 2011

ILZ010-212315-
LEE IL-
558 PM CDT TUE JUN 21 2011

...SPECIAL WEATHER STATEMENT...

AT 554 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG
THUNDERSTORM NEAR WALTON...MOVING NORTH AT 25 MPH.

NICKEL SIZE HAIL AND WINDS UP TO 50 MPH...ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...WALTON AND AMBOY AROUND 615 PM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE
OBJECTS TO BLOW AROUND.  SEEK SHELTER IN A STURDY STRUCTURE UNTIL
THIS STORM HAS PASSED.

LAT...LON 4184 8952 4183 8920 4158 8930 4158 8956

IZZI

Local storm report, Jun 21, 5:25 PM CST, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
625 PM CDT TUE JUN 21 2011

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

0606 PM     FUNNEL CLOUD     4 NNW KINGSTON          42.15N 88.79W
06/21/2011                   BOONE              IL   TRAINED SPOTTER

&&

ACS

Local storm report, Jun 21, 5:26 PM CST, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
626 PM CDT TUE JUN 21 2011

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

0614 AM     TORNADO          2 SE BONFIELD           41.13N 88.03W
06/20/2011                   KANKAKEE           IL   LAW ENFORCEMENT

            TORNADO TOUCHED DOWN NEAR 8344N ROUTE 17 IN THE SOUTHEAST
            PORTION OF BONFIELD. IT THEN TRACKED NORTHEAST AT 45
            MPH...DISSIPATING/LIFTING NEAR 5732N 2000N...3 MILES DUE
            EAST OF INCORPORATED BONFIELD...APPROXIMATELY 3 MINUTES
            AFTER TOUCHING DOWN. THE TORNADO WAS RATED A HIGH END
            EF-1...WITH MAXIMUM WIND SPEEDS OF 105-110 MPH. ITS PATH
            LENGTH WAS 2.45 MILES AND A MAXIMUM PATH WIDTH OF ABOUT
            100 YARDS.

&&

RC

Special weather statement, Jun 21, 5:44 PM CST, 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
644 PM CDT TUE JUN 21 2011

ILZ023-032-033-039-INZ010-011-019-220015-
BENTON IN-FORD IL-IROQUOIS IL-JASPER IN-KANKAKEE IL-LIVINGSTON IL-
NEWTON IN-
644 PM CDT TUE JUN 21 2011

...SPECIAL WEATHER STATEMENT...

AT 639 PM/739 PM/...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 22 MILES WEST OF
GIBSON CITY TO 14 MILES SOUTH OF BOSWELL...MOVING NORTH AT 40 MPH.

WINDS UP TO 50 MPH...FREQUENT CLOUD TO GROUND LIGHTNING...AND HEAVY
DOWNPOURS...ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
  PAXTON...             GIBSON CITY...        TALBOT...
  TEMPLETON...          OTTERBEIN...          OXFORD...
  BOSWELL...            CLAYTONVILLE...       ATKINSON...
  DUNNINGTON...         CISSNA PARK...        BUCKLEY...

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.

LAT...LON 4061 8846 4062 8858 4075 8859 4076 8865
      4100 8853 4100 8692 4091 8693 4091 8698
      4084 8698 4083 8709 4047 8710 4048 8793
      4040 8793 4040 8846

BIRK

Special weather statement, Jun 21, 5:47 PM CST, 3 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL...CORRECTION
647 PM CDT TUE JUN 21 2011

ILZ023-032-033-039-INZ010-011-019-220015-
BENTON IN-FORD IL-IROQUOIS IL-JASPER IN-KANKAKEE IL-LIVINGSTON IL-
NEWTON IN-
647 PM CDT TUE JUN 21 2011

...SPECIAL WEATHER STATEMENT...

AT 639 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 22 MILES WEST OF
GIBSON CITY TO 14 MILES SOUTH OF BOSWELL...MOVING NORTH AT 40 MPH.

WINDS UP TO 50 MPH...FREQUENT CLOUD TO GROUND LIGHTNING...AND HEAVY
DOWNPOURS...ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
  PAXTON...             GIBSON CITY...        TALBOT...
  TEMPLETON...          OTTERBEIN...          OXFORD...
  BOSWELL...            CLAYTONVILLE...       ATKINSON...
  DUNNINGTON...         CISSNA PARK...        BUCKLEY...

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.

LAT...LON 4061 8846 4062 8858 4075 8859 4076 8865
      4100 8853 4100 8692 4091 8693 4091 8698
      4084 8698 4083 8709 4047 8710 4048 8793
      4040 8793 4040 8846

BIRK

The radar

The Chicago radar (KLOT), 93 km away, was scanning. The volume nearest the first event began at 23:49 UTC.

Open the radar archive at this moment

Event by event

74 thunderstorm wind, 2 lightning, 2 flood, 2 tornado. Local standard time, as filed.

Thunderstorm Wind, La Salle

When: June 21, 5:50 PM CST to 5:55 PM CST
Where: La Salle County, 1.89 mi NW of Peru
Measured: 65 kt (75 mph) measured gust
Reported by: AWOS
Coordinates: 41.352, -89.152

Thunderstorm Wind, La Salle

When: June 21, 5:58 PM CST
Where: La Salle County, 1.38 mi SSW of Lostant
Measured: 52 kt (60 mph) measured gust
Reported by: Trained Spotter
Coordinates: 41.130, -89.075

Winds gusting to 60 mph was measured on Interstate 39 approximately one mile north of Route 18.

Thunderstorm Wind, Ford

When: June 21, 6:05 PM CST
Where: Ford County, 1.39 mi WNW of Paxton Arpt
Measured: 50 kt (58 mph) estimated gust
Reported by: Law Enforcement
Coordinates: 40.455, -88.156

A tree was downed near the intersection of Route 9 and 1600 E.

Thunderstorm Wind, Livingston

When: June 21, 6:20 PM CST
Where: Livingston County, Pontiac
Measured: 62 kt (71 mph) measured gust
Reported by: Trained Spotter
Coordinates: 40.870, -88.620

A wind gust to 71 mph was measured in Pontiac. Several tree limbs were blown down, some onto power lines.

Thunderstorm Wind, McHenry

When: June 21, 6:30 PM CST
Where: McHenry County, 1.72 mi N of Fox River Grove
Measured: 50 kt (58 mph) estimated gust
Reported by: Newspaper
Coordinates: 42.225, -88.219

A tree limb was blown down onto power lines on South Rawson Bridge Road between Three Oaks and Crystal Lakes roads.

Lightning, McHenry

When: June 21, 6:30 PM CST
Where: McHenry County, 1.64 mi NNE of Wonder Lake
Property damage: $10,000
Reported by: Newspaper
Coordinates: 42.403, -88.340

Lightning struck a house in the 5300 block of East Wonder Lake Road and started a fire in the attic.

Flood, La Salle

When: June 21, 7:00 PM CST to 11:00 PM CST
Where: La Salle County, 1.08 mi NNW of Marseilles to 2.14 mi W of Marseilles
Cause: Heavy Rain
Property damage: $50,000
Reported by: Newspaper
Coordinates: 41.345, -88.728

Minor street flooding along with some basement flooding was reported. Storm total rainfall amounts of 1.50 inches were measured in Marseilles.

Thunderstorm Wind, Will

When: June 21, 7:10 PM CST
Where: Will County, 1.97 mi NNW of Romeoville
Measured: 52 kt (60 mph) measured gust
Reported by: State Official
Coordinates: 41.654, -88.090

Winds gusts were estimated to 60 mph near the intersection of Normantown Road and Hudson Avenue.

Thunderstorm Wind, Kane

When: June 21, 7:11 PM CST
Where: Kane County, 0.93 mi N of Scraper Moecherville
Measured: 56 kt (64 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 41.743, -88.278

Estimated gusts to 65 mph occurred one block south of Four Seasons Boulevard and Victoria Park Circle.

Thunderstorm Wind, Will

When: June 21, 7:15 PM CST
Where: Will County, 0.68 mi WSW of Crest Hill
Measured: 56 kt (64 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 41.566, -88.162

Estimated 65 mph winds occurred near the intersection of Caton Farm Road and Essington Road.

Thunderstorm Wind, Cook

When: June 21, 7:18 PM CST
Where: Cook County, Lemont
Measured: 65 kt (75 mph) estimated gust
Property damage: $1,000
Reported by: Newspaper
Coordinates: 41.670, -88.000

Five trees were blown down across parts of Bluff Road. Other tree limbs and power lines were blown down.

Thunderstorm Wind, Du Page

When: June 21, 7:25 PM CST
Where: Du Page County, 4 mi WSW of Lisle
Measured: 50 kt (58 mph) measured gust
Reported by: Mesonet
Coordinates: 41.778, -88.152

Thunderstorm Wind, Will

When: June 21, 7:25 PM CST
Where: Will County, Bolingbrook
Measured: 55 kt (63 mph) estimated gust
Property damage: $1,000
Reported by: Trained Spotter
Coordinates: 41.670, -88.130

The sidewall of an aluminum shed was blown down.

Thunderstorm Wind, Du Page

When: June 21, 7:28 PM CST
Where: Du Page County, 1.44 mi SW of Wheaton
Measured: 65 kt (75 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 41.858, -88.142

Transformers exploded when an estimated 75 mph gust occurred near the intersection of Roosevelt Road and County Farm Road.

Thunderstorm Wind, Will

When: June 21, 7:30 PM CST
Where: Will County, 1.09 mi WNW of Lockport Lewis Arpt
Measured: 57 kt (66 mph) measured gust
Reported by: AWOS
Coordinates: 41.608, -88.098

Winds gusting to 66 mph were measured at the Lewis University Airport AWOS and 60 mph at the National Weather Service office nearby.

Thunderstorm Wind, Will

When: June 21, 7:30 PM CST
Where: Will County, 3.33 mi W of Plainfield Clow Arpt
Measured: 62 kt (71 mph) measured gust
Reported by: Mesonet
Coordinates: 41.708, -88.194

Thunderstorm Wind, Du Page

When: June 21, 7:30 PM CST
Where: Du Page County, Westmont
Measured: 60 kt (69 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 41.800, -87.970

A 15 inch diameter tree was split down the middle with a 6 inch diameter branch broken off.

Tornado, Du Page

When: June 21, 7:31 PM CST to 7:33 PM CST
Where: Du Page County, 1.53 mi SE of The Meadows to 1.05 mi SSW of Downers Grove
Rating: EF1
Path length: 2.06 mi
Path width: 200 yd
Property damage: $500,000
Reported by: NWS Storm Survey
Coordinates: 41.762, -88.032

A National Weather Service storm survey confirmed an EF1 tornado touched down near Sunnydale Park and lifted near 55th and Main in Downers Grove. Most of the damage was to trees. Many mature hardwood trees had been snapped or knocked down. A fence was blown down at Downers Grove High School. An estimated 35 homes were damaged by falling trees.

Thunderstorm Wind, Will

When: June 21, 7:34 PM CST
Where: Will County, Bolingbrook
Measured: 52 kt (60 mph) measured gust
Reported by: Trained Spotter
Coordinates: 41.670, -88.130

Small trees were blown down.

Lightning, Kane

When: June 21, 7:34 PM CST
Where: Kane County, 2.1 mi ENE of Sugar Grove
Property damage: $95,000
Reported by: Newspaper
Coordinates: 41.761, -88.412

A house was struck by lightning on Carol Street causing extensive structural damage.

Thunderstorm Wind, Cook

When: June 21, 7:34 PM CST
Where: Cook County, 0.58 mi S of Broadview
Measured: 70 kt (81 mph) estimated gust
Property damage: $5,000
Reported by: Newspaper
Coordinates: 41.842, -87.850

A huge oak tree was uprooted along 26th Place in Brookfield. The tree fell on top of a house, but all of the large limbs remained in the air and no damage was reported to the roof. Additional trees, tree limbs and power lines were blown down in Brookfield.

Thunderstorm Wind, Du Page

When: June 21, 7:35 PM CST
Where: Du Page County, 1.91 mi SSW of Downers Grove to 1.38 mi SSE of Downers Grove
Measured: 56 kt (64 mph) estimated gust
Property damage: $25,000
Reported by: Public
Coordinates: 41.773, -88.009

Tree limbs as large as 18 inches in diameter were blown down between the intersections of 63rd and Main Street and 59th Street and Fairview. Structural damage was also reported to roofs.

Thunderstorm Wind, Du Page

When: June 21, 7:36 PM CST
Where: Du Page County, Hinsdale
Measured: 70 kt (81 mph) estimated gust
Property damage: $50,000
Reported by: Newspaper
Coordinates: 41.800, -87.930

At least 50 trees were blown down with damage to hundreds of other trees. Tree limbs fell onto houses and cars. A transmission line that supplies electricity to the southern half of the city was also blown down, in addition to numerous other power lines.

Thunderstorm Wind, Du Page

When: June 21, 7:37 PM CST to 7:41 PM CST
Where: Du Page County, Westmont to 1.15 mi NNE of Elmhurst
Measured: 65 kt (75 mph) estimated gust
Property damage: $10,000
Reported by: Trained Spotter
Coordinates: 41.800, -87.970

Winds were estimated between 60 and 75 mph across portions of east-central DuPage County causing numerous branches to fall and power outages. A large tree fell onto Route 53 approximately one mile north of Roosevelt Road blocking the northbound lane in Lombard. A 14 inch diameter tree fell onto a car near the intersection of Fordham Way and Longford Drive in Westmont. Also in Westmont, a neighborhood near 55th Street and Clarendon Hills Road had numerous 10 inch diameter or greater tree limbs blown down. A garage was heavily damaged by a falling tree in Elmhurst and a large tree was snapped off at its base on Berteau in Elmhurst.

Thunderstorm Wind, Du Page

When: June 21, 7:37 PM CST to 7:39 PM CST
Where: Du Page County, 0.8 mi ESE of Wheaton to 1.03 mi E of Wheaton
Measured: 62 kt (71 mph) measured gust
Reported by: Emergency Manager
Coordinates: 41.864, -88.107

Emergency managers in DuPage County measured 62 mph wind gusts in Wheaton while a mesonet just north of Wheaton measured 59 mph wind gusts.

Thunderstorm Wind, Du Page

When: June 21, 7:37 PM CST
Where: Du Page County, 0.63 mi SW of Butterfield West
Measured: 70 kt (81 mph) estimated gust
Property damage: $40,000
Reported by: Newspaper
Coordinates: 41.864, -88.060

A 100 foot tall maple tree was blown down onto a house causing signficant damage to the roof and attic.

Thunderstorm Wind, Cook

When: June 21, 7:37 PM CST
Where: Cook County, La Grange
Measured: 65 kt (75 mph) estimated gust
Property damage: $150,000
Reported by: Newspaper
Coordinates: 41.820, -87.880

The west side of La Grange was hit the hardest with numerous trees, tree limbs and power lines blown down. Some streets were completely blocked due to the fallen trees. Six homes and one garage were damaged by the falling trees and limbs and at least one vehicle was damaged.

Thunderstorm Wind, Du Page

When: June 21, 7:38 PM CST
Where: Du Page County, Villa Park
Measured: 65 kt (75 mph) estimated gust
Reported by: Newspaper
Coordinates: 41.880, -87.980

Hundreds of trees were damaged in Villa Park. About 20 mature trees were removed due to severe damage.

Thunderstorm Wind, Cook

When: June 21, 7:39 PM CST
Where: Cook County, 1.31 mi S of Hanson Park
Measured: 65 kt (75 mph) estimated gust
Property damage: $50,000
Reported by: Newspaper
Coordinates: 41.881, -87.816

A 14 inch diameter, 20 foot long tree limb fell on a porch on Ashland Avenue. Several homes and at least one car were damaged.

Thunderstorm Wind, Cook

When: June 21, 7:39 PM CST to 7:43 PM CST
Where: Cook County, 6.8 mi WNW of Chicago to 12.5 mi NNW of Chicago
Measured: 65 kt (75 mph) estimated gust
Reported by: Department of Highways
Coordinates: 41.868, -87.772

The City of Chicago Streets and Sanitation reported 1,120 tree emergencies, which can range from a tree limb blown down to an entire tree blown over or uprooted.

Thunderstorm Wind, Du Page

When: June 21, 7:41 PM CST
Where: Du Page County, Wheaton
Measured: 65 kt (75 mph) estimated gust
Property damage: $30,000
Reported by: Newspaper
Coordinates: 41.870, -88.120

The top of a huge tree was snapped off and crashed through part of a bedroom of a house causing significant damage.

Thunderstorm Wind, Kane

When: June 21, 7:42 PM CST
Where: Kane County, 1.4 mi NNW of Geneva
Measured: 56 kt (64 mph) estimated gust
Property damage: $2,000
Reported by: Newspaper
Coordinates: 41.898, -88.312

A tree was blown down on Gray Street. Tree limbs and power lines were also blown down in parts of Geneva.

Thunderstorm Wind, Cook

When: June 21, 7:43 PM CST
Where: Cook County, 0.52 mi NNW of Avondale
Measured: 55 kt (63 mph) estimated gust
Injuries: 2 direct, 0 indirect
Property damage: $10,000
Reported by: Broadcast Media
Coordinates: 41.977, -87.684

Local media reported that two people were in serious to critical condition after their car was crushed by a falling tree near the intersection of Farragut Avenue and Leavitt Street.

Thunderstorm Wind, Du Page

When: June 21, 7:43 PM CST
Where: Du Page County, 0.61 mi ESE of Bensenville
Measured: 70 kt (81 mph) estimated gust
Property damage: $40,000
Reported by: Newspaper
Coordinates: 41.946, -87.919

A roof was blown off a building on Waveland. Part of the roof was tangled in nearby power lines.

Thunderstorm Wind, Du Page

When: June 21, 7:43 PM CST
Where: Du Page County, Bensenville
Measured: 65 kt (75 mph) estimated gust
Property damage: $60,000
Reported by: Newspaper
Coordinates: 41.950, -87.930

High winds blew over several bleachers, blew down a fence along with many downed trees in Redmond Park. Numerous trees and tree limbs were blown down in parts of Bensenville. Some of the trees fell onto cars.

Thunderstorm Wind, McHenry

When: June 21, 7:45 PM CST
Where: McHenry County, Lake in the Hills
Measured: 59 kt (68 mph) measured gust
Reported by: Trained Spotter
Coordinates: 42.180, -88.320

Three medium sized trees were blown over.

Thunderstorm Wind, Du Page

When: June 21, 7:45 PM CST
Where: Du Page County, 1.7 mi N of Willowbrook
Measured: 56 kt (64 mph) estimated gust
Property damage: $5,000
Reported by: Public
Coordinates: 41.775, -87.967

A 14 inch diameter tree fell on a car near Fordham Way and Longford Drive.

Thunderstorm Wind, Cook

When: June 21, 7:45 PM CST
Where: Cook County, Schaumburg
Measured: 52 kt (60 mph) measured gust
Reported by: Mesonet
Coordinates: 42.030, -88.080

Thunderstorm Wind, Cook

When: June 21, 7:45 PM CST
Where: Cook County, 1.47 mi SSW of Winnetka
Measured: 60 kt (69 mph) measured gust
Reported by: Mesonet
Coordinates: 42.100, -87.730

Thunderstorm Wind, Du Page

When: June 21, 7:45 PM CST
Where: Du Page County, 0.28 mi ENE of Downers Grove
Measured: 56 kt (64 mph) estimated gust
Reported by: Public
Coordinates: 41.801, -87.995

A 14 inch diameter tree was uprooted near the intersection of Fairview Avenue and Gierz Street.

Thunderstorm Wind, Du Page

When: June 21, 7:45 PM CST
Where: Du Page County, 1.65 mi N of Willowbrook
Measured: 56 kt (64 mph) estimated gust
Reported by: Public
Coordinates: 41.774, -87.975

The top of a 6 to 8 inch diameter maple tree was snapped off near Cass Avenue and 63rd Street.

Thunderstorm Wind, Du Page

When: June 21, 7:45 PM CST
Where: Du Page County, 1.08 mi SE of Westmont
Measured: 61 kt (70 mph) estimated gust
Reported by: Public
Coordinates: 41.788, -87.956

Numerous tree limbs were blown down near 55th Street and Clarendon Hills Road. Some tree limbs were 10 inches or greater in diameter.

Thunderstorm Wind, Cook

When: June 21, 7:45 PM CST
Where: Cook County, 0.17 mi ESE of Cumberland
Measured: 61 kt (70 mph) estimated gust
Reported by: Public
Coordinates: 42.049, -87.917

Multiple whole trees were blown down northeast of Cumberland Parkway.

Thunderstorm Wind, Cook

When: June 21, 7:46 PM CST
Where: Cook County, Franklin Park
Measured: 70 kt (81 mph) estimated gust
Property damage: $100,000
Reported by: Newspaper
Coordinates: 41.930, -87.820

Numerous trees, tree limbs and power lines were blown down. Many trees fell onto houses and garages. The roof of an apartment building on Chestnut Street was blown off.

Thunderstorm Wind, Cook

When: June 21, 7:47 PM CST
Where: Cook County, (Ord)o'Hare Intl Arp
Measured: 61 kt (70 mph) measured gust
Reported by: ASOS
Coordinates: 41.980, -87.900

Thunderstorm Wind, Cook

When: June 21, 7:47 PM CST
Where: Cook County, 0.22 mi S of Orchard Place
Measured: 65 kt (75 mph) estimated gust
Property damage: $100
Reported by: Newspaper
Coordinates: 41.997, -87.879

A large tree was blown down near the Rosemont Fitness Center. Part of the tree damaged 8 feet of chain link fence. Other tree limbs were blown down.

Thunderstorm Wind, Cook

When: June 21, 7:47 PM CST
Where: Cook County, Norridge to Harwood Hgts
Measured: 65 kt (75 mph) estimated gust
Property damage: $50,000
Reported by: Newspaper
Coordinates: 41.970, -87.800

In Harwood Heights, every block had either broken trees or tree limbs. Some streets were completely blocked by fallen trees. A few cars were damaged by fallen trees. One car was damaged by a live powerline when it started a fire. Numerous other powerlines were blown down.

Thunderstorm Wind, Cook

When: June 21, 7:47 PM CST
Where: Cook County, Lincolnwood
Measured: 65 kt (75 mph) estimated gust
Property damage: $15,000
Reported by: Newspaper
Coordinates: 42.020, -87.730

Numerous trees, tree limbs and power lines were blown down. One tree fell onto a parked car on Keating Avenue.

Thunderstorm Wind, Cook

When: June 21, 7:48 PM CST
Where: Cook County, Skokie
Measured: 65 kt (75 mph) estimated gust
Property damage: $50,000
Reported by: Newspaper
Coordinates: 42.030, -87.720

Numerous trees, tree limbs and power lines were blown. Some trees and limbs fell on cars causing damage. A 40 foot tall tree was completely uprooted on Kolmar Street and fell onto a house. Twelve inch diameter tree limbs were blown down near Skokie Village Hall.

Tornado, Cook

When: June 21, 7:48 PM CST to 7:50 PM CST
Where: Cook County, 1.57 mi W of Cumberland to 0.88 mi NNW of Mt Prospect
Rating: EF1
Path length: 2.37 mi
Path width: 200 yd
Property damage: $50,000
Reported by: NWS Storm Survey
Coordinates: 42.047, -87.950

A tornado touched down near the intersection of We Go Trail and Golf Road and moved north-northeast before lifting near the intersection of North Pine Street and Kensington Road. Most of the damage was fallen trees, a few of which fell onto houses causing structural damage. An estimated 2,000 trees were damaged in Mt. Prospect with 130 completely blown down or that needed to be removed. Most of the tree damage was in and near the path of the tornado.

Thunderstorm Wind, Cook

When: June 21, 7:48 PM CST
Where: Cook County, Park Ridge
Measured: 65 kt (75 mph) estimated gust
Property damage: $25,000
Reported by: Newspaper
Coordinates: 42.030, -87.870

Tree limbs, utility poles and power lines were blown down. A large tree limb fell on a parked car causing significant damage.

Thunderstorm Wind, Cook

When: June 21, 7:49 PM CST
Where: Cook County, Niles
Measured: 65 kt (75 mph) estimated gust
Property damage: $50,000
Reported by: Newspaper
Coordinates: 42.030, -87.800

Trees, tree limbs and power lines were blown down. Over 100 trees were blown down or needed to be completely removed. Numerous grocery stores and restaurants had to rent refrigerated trucks or ship perishable items to warehouses due to extended power outages. Three cars were damaged by falling tree limbs including one on Neva Avenue, one on Touhy Avenue and a one on Oakton Street.

Thunderstorm Wind, Cook

When: June 21, 7:50 PM CST
Where: Cook County, 1.09 mi NE of Morton Grove to 1.88 mi NNE of Morton Grove
Measured: 61 kt (70 mph) estimated gust
Property damage: $10,000
Reported by: Trained Spotter
Coordinates: 42.041, -87.754

Several large trees were blown down near Dempster Street, approximately two blocks east of Interstate 94. One tree fell onto a car. Several 12 inch diameter trees were uprooted near the intersection of Laramie Avenue and Golf Road.

Thunderstorm Wind, Cook

When: June 21, 7:50 PM CST
Where: Cook County, Morton Grove
Measured: 61 kt (70 mph) estimated gust
Property damage: $2,000
Reported by: Trained Spotter
Coordinates: 42.030, -87.770

Wind gusts were estimated to 70 mph. Numerous trees, tree limbs and power lines were blown down in Morton Grove.

Thunderstorm Wind, Cook

When: June 21, 7:50 PM CST
Where: Cook County, 0.38 mi E of Cumberland
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 42.050, -87.913

Wind gusts were estimated to 60 mph in Des Plaines with multiple large tree limbs blown down near the intersection of Golf Road and Wolf Road.

Thunderstorm Wind, Kane

When: June 21, 7:50 PM CST
Where: Kane County, 1 mi E of Elgin
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 42.030, -88.260

Wind gusts were estimated to 60 mph.

Thunderstorm Wind, Cook

When: June 21, 7:50 PM CST
Where: Cook County, 1.8 mi SW of Cumberland
Measured: 65 kt (75 mph) estimated gust
Property damage: $50,000
Reported by: Newspaper
Coordinates: 42.033, -87.947

Part of the roof of a building on Malmo Drive was ripped off.

Thunderstorm Wind, Cook

When: June 21, 7:50 PM CST
Where: Cook County, 0.61 mi NNE of The Greens
Measured: 65 kt (75 mph) estimated gust
Property damage: $15,000
Reported by: Newspaper
Coordinates: 42.058, -87.844

A 35 foot by 40 foot section of an apartment building roof was blown off a multifamily residence on Josephine Street in Maine Township.

Thunderstorm Wind, Cook

When: June 21, 7:50 PM CST
Where: Cook County, Des Plaines
Measured: 65 kt (75 mph) estimated gust
Property damage: $50,000
Reported by: Newspaper
Coordinates: 42.030, -87.900

Numerous trees, tree limbs, utility poles and power lines were blown down. A transformer was completely blown off a utility pole. A large tree fell onto a house on Oakwood Street but only caused damage to the gutters. Damage was also reported to netting and fencing at a golf course.

Thunderstorm Wind, Cook

When: June 21, 7:51 PM CST
Where: Cook County, Arlington Hgts
Measured: 61 kt (70 mph) estimated gust
Property damage: $1,000
Reported by: Newspaper
Coordinates: 42.080, -88.000

Tree limbs and power lines were blown down.

Thunderstorm Wind, Cook

When: June 21, 7:51 PM CST
Where: Cook County, Rolling Meadows
Measured: 60 kt (69 mph) estimated gust
Property damage: $1,000
Reported by: Newspaper
Coordinates: 42.080, -88.000

Tree limbs and power lines were blown down.

Thunderstorm Wind, Cook

When: June 21, 7:52 PM CST
Where: Cook County, Prospect Hgts
Measured: 65 kt (75 mph) estimated gust
Property damage: $40,000
Reported by: Newspaper
Coordinates: 42.100, -87.930

Trees, tree limbs and power lines were blown down in many areas in Prospect Heights. A large tree was completely uprooted along the Willow Sloughs. The roof of an apartment building on Wolf Road was blown off.

Thunderstorm Wind, Cook

When: June 21, 7:52 PM CST
Where: Cook County, Palatine
Measured: 56 kt (64 mph) estimated gust
Property damage: $1,000
Reported by: Newspaper
Coordinates: 42.100, -88.050

Tree limbs and power lines were blown down.

Thunderstorm Wind, Cook

When: June 21, 7:54 PM CST
Where: Cook County, 1.11 mi S of Wheeling
Measured: 70 kt (81 mph) measured gust
Property damage: $750,000
Reported by: ASOS
Coordinates: 42.114, -87.898

Wind gusts to 81 mph were measured at Chicago Executive Airport. Roof damage was reported to three hangers. Four airplanes were damaged, with two of them flipped over. Approximately 1,000 feet of fencing was destroyed. A willow tree was uprooted on Wolf Road in Wheeling.

Thunderstorm Wind, Cook

When: June 21, 7:54 PM CST
Where: Cook County, Schaumburg
Measured: 61 kt (70 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 42.030, -88.080

Estimated wind gusts to 70 mph occurred in Schaumburg.

Thunderstorm Wind, Cook

When: June 21, 7:54 PM CST
Where: Cook County, Elk Grove Vlg
Measured: 52 kt (60 mph) estimated gust
Property damage: $1,000
Reported by: Trained Spotter
Coordinates: 42.020, -87.980

Wind gusts were estimated to 60 mph. Tree limbs and power lines were blown down.

Thunderstorm Wind, Cook

When: June 21, 7:55 PM CST
Where: Cook County, Hoffman Estates
Measured: 56 kt (64 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 42.050, -88.120

Wind gusts were estimated to 65 mph.

Thunderstorm Wind, Cook

When: June 21, 7:55 PM CST
Where: Cook County, Mt Prospect
Measured: 70 kt (81 mph) estimated gust
Property damage: $10,000
Reported by: Newspaper
Coordinates: 42.070, -87.930

Numerous large trees, tree limbs and power lines were blown down. Several roads were blocked by the fallen trees.

Thunderstorm Wind, Cook

When: June 21, 7:55 PM CST
Where: Cook County, Wheeling
Measured: 65 kt (75 mph) estimated gust
Reported by: Newspaper
Coordinates: 42.130, -87.900

A large section of a tree was blown down narrowly missing a house.

Thunderstorm Wind, Cook

When: June 21, 7:57 PM CST
Where: Cook County, Glencoe
Measured: 65 kt (75 mph) estimated gust
Property damage: $50,000
Reported by: Newspaper
Coordinates: 42.130, -87.750

Trees, tree limbs and power lines were blown down in many areas. Some trees fell onto houses and other buildings. Power outages lasted several days causing significant food spoilage.

Thunderstorm Wind, Lake

When: June 21, 7:59 PM CST
Where: Lake County, Buffalo Grove
Measured: 65 kt (75 mph) estimated gust
Property damage: $5,000
Reported by: Newspaper
Coordinates: 42.150, -87.970

Hundreds of trees were damaged in and around the Buffalo Grove area. Utility poles and power lines were also blown down.

Flood, La Salle

When: June 21, 8:00 PM CST to 9:00 PM CST
Where: La Salle County, 1.35 mi SSE of Marseilles to 1.37 mi SSE of Marseilles
Cause: Heavy Rain
Reported by: Trained Spotter
Coordinates: 41.311, -88.714

Heavy rain caused 5 to 6 inches of standing water at the intersection of County Road 15 and County Road 30.

Thunderstorm Wind, Lake

When: June 21, 8:00 PM CST
Where: Lake County, 1.18 mi SSE of Deerfield Estates
Measured: 55 kt (63 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 42.153, -87.915

Several tree limbs 6 to 14 inches in diameter were blown down near Milwaukee Avenue and Lake Cook Road.

Thunderstorm Wind, Lake

When: June 21, 8:00 PM CST
Where: Lake County, Deerfield
Measured: 65 kt (75 mph) estimated gust
Property damage: $2,000
Reported by: Newspaper
Coordinates: 42.170, -87.850

Numerous trees, tree limbs and power lines were blown down.

Thunderstorm Wind, Lake

When: June 21, 8:01 PM CST
Where: Lake County, 0.05 mi W of Blodgett
Measured: 60 kt (69 mph) estimated gust
Property damage: $5,000
Reported by: Newspaper
Coordinates: 42.180, -87.801

Tree limbs and power lines were blown down in Highland Park. A large tree was uprooted along Sheridan Road. When a back-up generator kicked on at a water plant, it created a pressure surge that blew a fist-sized hole in a water main.

Thunderstorm Wind, Lake

When: June 21, 8:02 PM CST
Where: Lake County, Lake Forest
Measured: 65 kt (75 mph) estimated gust
Reported by: Newspaper
Coordinates: 42.220, -87.830

Approximately 300 trees were damaged in Lake Forest with 35 trees blown down or were damaged severely enough to be removed.

Thunderstorm Wind, Lake

When: June 21, 8:06 PM CST
Where: Lake County, Mundelein
Measured: 60 kt (69 mph) estimated gust
Property damage: $2,000
Reported by: Newspaper
Coordinates: 42.270, -88.000

Trees, tree limbs and power lines were blown down.

Thunderstorm Wind, Lake

When: June 21, 8:08 PM CST
Where: Lake County, Libertyville
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 42.280, -87.950

Wind gusts were estimated to 60 mph.

Thunderstorm Wind, Lake

When: June 21, 8:09 PM CST
Where: Lake County, 0.34 mi SW of Rondout
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 42.277, -87.905

Wind gusts were estimated to 60 mph approximately one mile north of Interstate 94 on Bradley Road.

Thunderstorm Wind, Lake

When: June 21, 8:17 PM CST
Where: Lake County, 0.4 mi NW of Waukegan
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 42.374, -87.836

Wind gusts were estimated to 60 mph near the intersection of North Avenue and Ridgeland Avenue where multiple 30-foot long branches were blown down.

What these are

Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Lightning: A lightning strike that killed, injured or caused damage.
Flood: Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Illinois in 2011 Every state in 2011 This day in weather history The tornado archive for Illinois, 2011 Warnings in Illinois, June 2011

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 322162, 322164, 322163, 322165, 330588, 330589, 330598, 322307, 322308, 322309, 327804, 322310, 324656, 322311, 322312, 322313, 322314, 322315, 322320, 326669, 326756, 324040, 327829, 322322, 322323, 326687, 327822, 328039, 326743, 330549, 326701, 326676, 322326, 326683, 326691, 322327, 324022, 324024, 324026, 324030, and more.