Illinois, 2007

Tornado and Flash Flooding in Illinois, August 23 to 27, 2007

August 23 to 27, 2007 · NWS LOT · 136 events in 12 counties and zones

Powerful and damaging thunderstorms moved across northern Illinois producing widespread wind damage. The most intense wind damage occurred along a path which began in far western Dupage County near the intersection of Roosevelt Road and Washington Street in West Chicago and continued east through the northern portions Lombard and Glen Ellyn, into Northlake, then across the north side of Chicago…

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
2
Injuries
49
Property damage
$14 million
Crop damage
$560,000
Events
136

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.

Powerful and damaging thunderstorms moved across northern Illinois producing widespread wind damage. The most intense wind damage occurred along a path which began in far western Dupage County near the intersection of Roosevelt Road and Washington Street in West Chicago and continued east through the northern portions Lombard and Glen Ellyn, into Northlake, then across the north side of Chicago to the Lake Michigan Shore near Montrose Harbor. Wind damage along this path was consistent with winds 60 to 80 mph. Smaller pockets of more intense damage with winds of 80 to 100 mph were noted in the Wrigleyville area. The City of Chicago reported over 6,400 tree emergencies, over 200 damaged light poles, and over 350 downed power lines. A 40 inch diameter tree was blown down on West Waveland Street in Chicago. ComEd reported that a total of 615,000 customers lost power during the storms.

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 Aug 23, 2:55 AM CST, 2 hours 5 minutes earlier.

Area forecast discussion, Aug 23, 2:55 AM CST, 2 hours 5 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
355 AM CDT THU AUG 23 2007

.DISCUSSION...
355 AM CDT

THREAT OF PERIODIC THUNDERSTORMS AND ACCOMPANYING POTENTIAL FOR
ADDITIONAL MODERATE TO HEAVY RAINFALL TODAY THROUGH FRIDAY NIGHT
REMAINS FORECAST CONCERN.

MULTIPLE SHORT WAVES CONTINUE TO MOVE QUICKLY FROM THE PLAINS
NORTHEASTWARD INTO/TOWARD THE WESTERN GREAT LAKES. ONE THAT BROUGHT
STORMS ACROSS THE AREA LATE WED NIGHT AND EARLY THIS MORNING NOW
MOVING ACROSS LOWER MI WHILE NEXT RIGHT ON ITS HEELS MOVING OUT OF
EASTERN IA. STORMS ACROSS NORTHERN IL AHEAD OF THIS DISTURBANCE WILL
BE EXITING N CENTRAL AND NE IL BEFORE DAYBREAK SO WILL LET EXISTING
FLASH FLOOD WATCH DIE AT 7 AM CDT.

WHILE MULTIPLE SIGNIFICANT THUNDERSTORM OUTFLOWS PUSH SE ACROSS
NORTHERN IL AND NW IN...STRONG LOW LEVEL FLO QUICKLY RECHARGES
UNSTABLE AIRMASS ACROSS CWA AND N ACROSS SRN WI S OF QUASISTATIONARY
FRONT. VIGOROUS TS ACTIVITY HAS MOVED E TO SERN SD AND ERN NEB AS
NEXT SHORT WAVE MOVES FROM THE ROCKIES OVER THE HI PLAINS. AS THIS
DISTURBANCE CONTINUES TO APPROACH THE LOCAL AREA TODAY ANTICIPATE
SIMILAR SCENARIO AS TO WED-WED NIGHT WITH MAIN CONVECTIVE ACTIVITY
REMAINING IN THE VICINITY OF THE SURFACE BOUNDARY WHICH KEEPS THEM
TO THE NW OF THE CWA INTO THIS AFTERNOON. AS THE SHORT WAVE TROF
LIFTS INTO THE UPPER MIDWEST LATE THIS AFTERNOON MID LEVEL UVV OVER
THE CWA INCREASES WHILE STRONG SW LO LEVEL FLO PUMPS PW VALUES INTO
2-2.5 INCH RANGE. NEW FFA WILL MOST LIKELY BE NEEDED BUT WILL HOLD
OFF FOR NOW TO PREVENT OVERLOAD OF VARIOUS HYDROLOGIC
WATCHES...WARNINGS AND STATEMENTS. MENTION OF POSSIBLE ADDITIONAL
HEAVY RAIN IN GRIDS AND TEXT PRODUCTS WILL KEEP WORLD INFORMED OF
CONTINUED POTENTIAL OF ADDITIONAL HEAVY RAIN LATE TODAY AND TONIGHT.
WITH NO SIGNIFICANT CHANGE IN THE PATTERN TODAY THE THREAT OF STRONG
WINDS WITH MORE BOWING SEGMENTS WILL AGAIN BE PRESENT.

HEAVY RAIN AND GUSTY WIND PRODUCING TSRA THREAT CONTINUES FRI AS
ANOTHER SHORT WAVE OR WAVES COME OUT OF THE WESTERN UPPER TROF AND A
WAVE ALONG THE SURFACE FRONT LIFTS FROM IA ACROSS WI AS THE MAIN
UPPER TROF MOVES OVER THE PLAINS. AS THIS TROF MOVES INTO THE
WESTERN GRTLKS LATE FRI NIGHT AND SAT MORNING THE BOUNDARY PUSHES SE
THRU THE CWA IN RESPONSE. THIS FINALLY TURNS OFF THE SPIGOT AS HI
PRES BUILDS SEWRD ACROSS WI AND IA INTO NRN IL DURING THE DAY
FOLLOWING THE UPPER TROF PASSAGE.

TRS

&&

.AVIATION...
240 AM CDT

WILL FORECAST THUNDERSTORMS AROUND 08 UTC TO 09 UTC. THE
THUNDERSTORMS ARE WITH ANOTHER MESOSCALE CONVECTIVE COMPLEX MOVING
INTO IOWA. THE SOUTH WIND WILL KEEP THE FOG FROM GETTING TO THICK
BETWEEN ROUNDS OF THUNDERSTORMS. THE CEILINGS WILL BE VFR EXCEPT
WHEN A THUNDERSTORM OR SHOWER PASSES OVER. THEN THERE COULD BE MVFR
OR IFR CEILINGS FOR A BRIEF TIME.

&&

.MARINE...
209 AM CDT

A LARGE LOW OVER NORTHERN MANITOBA HAS A COLD FRONT WHICH EXTENDS
INTO ONTARIO AND THEN WEST TOD CENTRAL MONTANA. THIS FRONT WILL
MOVE INTO LAKE MICHIGAN SATURDAY. BEFORE THEN...A STATIONARY FRONT
WILL LIE ACROSS FROM NORTHERN LAKE MICHIGAN TO WEST CENTRAL IOWA.
SMALL LOWS WILL MOVE ALONG THE FRONT. ONE WILL MOVE FROM NORTHERN
LAKE MICHIGAN TO SOUTHERN ONTARIO. THIS LOW WILL BE FOLLOWED BY
ANOTHER LOW WHICH WILL MOVE THROUGH NORTHERN ILLINOIS FRIDAY MORNING
AND INTO MICHIGAN FRIDAY NIGHT. AHEAD OF THIS LOW THE SOUTH WIND MAY
REACH 15 TO 25 KNOTS OVER LAKE MICHIGAN. BY SATURDAY THE WIND WILL
BE FROM THE NORTH 15 TO 25 KNOTS. WE USED THE GFS...ECMWF AND WRF
WEATHER FORECAST MODELS FOR THIS FORECAST.

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...FLASH FLOOD WATCH THRU 12Z THURSDAY WINNEBAGO BOONE MCHENRY
     LAKE AND OGLE.
IN...NONE.
LM...NONE.

&&
Hazardous weather outlook, Aug 23, 3:30 AM CST, 1 hour 30 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
430 AM CDT THU AUG 23 2007

ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
232200-
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-
430 AM CDT THU AUG 23 2007

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

.DAY ONE...TODAY AND TONIGHT.

THERE IS A SLIGHT CHANCE OF SEVERE STORMS WITH THE MAIN THREAT BEING
DAMAGING WINDS.

THERE IS A CHANCE OF THUNDERSTORMS THIS AFTERNOON IN NORTH CENTRAL
AND FAR NORTHEAST ILLINOIS. THUNDERSTORMS WILL BECOME LIKELY ACROSS
THOSE AREAS TONIGHT...WITH A CHANCE OF THUNDERSTORMS FROM EAST
CENTRAL ILLINOIS TO NORTHWEST INDIANA. SOME OF THESE THUNDERSTORMS
WILL LIKELY PRODUCE HEAVY DOWNPOURS AS WELL AS GUSTY WINDS.
ADDITIONAL HEAVY RAINFALL WOULD CREATE MORE FLOODING PROBLEMS AND
WORSEN ALREADY EXISTING FLOODING.

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

ADDITIONAL PERIODS OF THUNDERSTORMS ARE EXPECTED FRIDAY INTO EARLY
SATURDAY MORNING. HEAVY RAINFALL WILL BE POSSIBLE DURING THIS
PERIOD. THERE IS ALSO THE POTENTIAL THAT STRONGER STORMS COULD
PRODUCE DAMAGING WINDS.

THERE WILL BE A CHANCE OF THUNDERSTORMS WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY THIS AFTERNOON AND OR TONIGHT.

&&

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

LMZ740>745-766-230945-
WINTHROP HARBOR TO WILMETTE HARBOR IL-
WILMETTE HARBOR TO NORTHERLY ISLAND IL-
NORTHERLY ISLAND TO CALUMET HARBOR IL-
CALUMET HARBOR IL TO GARY IN-
GARY INDIANA TO BURNS HARBOR-
BURNS HARBOR TO MICHIGAN CITY-
LAKE MICHIGAN IL AND IN OPEN WATERS-
430 AM CDT THU AUG 22 2007

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

.DAY ONE...TODAY AND TONIGHT.

THERE IS A CHANCE OF THUNDERSTORMS ON THE ILLINOIS WATERS THIS
AFTERNOON. STORMS WILL BE LIKELY ON THE ILLINOIS WATERS
TONIGHT...WITH A CHANCE OF STORMS ON THE INDIANA WATERS. SOME OF THE
STORMS COULD PRODUCE STRONG GUSTY WINDS.

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

ADDITIONAL PERIODS OF THUNDERSTORMS ARE EXPECTED FRIDAY INTO EARLY
SATURDAY MORNING. THE THREAT OF STRONG WINDS FROM STRONGER STORMS
WILL CONTINUE.

THERE WILL BE A CHANCE OF THUNDERSTORMS WEDNESDAY.

&&

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

In the hours before

Local storm report, Aug 23, 12:27 AM CST, 4 hours 33 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
127 AM CDT THU AUG 23 2007

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

0800 PM     TSTM WND DMG     POLO                    41.98N 89.58W
08/22/2007                   OGLE               IL   CO-OP OBSERVER

            EIGHT INCH DIAMETER TREE LIMBS BLOWN DOWN.

0825 PM     TSTM WND DMG     POLO                    41.98N 89.58W
08/22/2007                   OGLE               IL   LAW ENFORCEMENT

            TREES DOWN ON POWER LINES.

0910 PM     TSTM WND GST     1 S EARLVILLE           41.57N 88.92W
08/22/2007  E60.00 MPH       LA SALLE           IL   TRAINED SPOTTER

0925 PM     TSTM WND DMG     SHERIDAN                41.53N 88.69W
08/22/2007                   LA SALLE           IL   EMERGENCY MNGR

            ONE TREE BLOWN DOWN. ESTIMATE WINDS 60 MPH.

0925 PM     TSTM WND GST     MARSEILLES              41.33N 88.69W
08/22/2007  M58.00 MPH       LA SALLE           IL   MESONET

0939 PM     TSTM WND GST     SANDWICH                41.65N 88.62W
08/22/2007  M45.00 MPH       DE KALB            IL   EMERGENCY MNGR

0957 PM     TSTM WND DMG     MORRIS                  41.37N 88.43W
08/22/2007                   GRUNDY             IL   PUBLIC

            POWER LINES BLOWN DOWN AT ROUTE 47 AND LISBEN.

1003 PM     TSTM WND GST     NEW LENOX               41.52N 87.98W
08/22/2007  E40.00 MPH       WILL               IL   TRAINED SPOTTER

1003 PM     HAIL             NEW LENOX               41.52N 87.98W
08/22/2007  E0.25 INCH       WILL               IL   TRAINED SPOTTER

1010 PM     TSTM WND GST     ROMEOVILLE              41.65N 88.09W
08/22/2007  M40.00 MPH       WILL               IL   OFFICIAL NWS OBS

1021 PM     HAIL             MATTESON                41.51N 87.74W
08/22/2007  M0.25 INCH       COOK               IL   AMATEUR RADIO

1024 PM     HAIL             WOODRIDGE               41.74N 88.04W
08/22/2007  M0.50 INCH       DUPAGE             IL   AMATEUR RADIO

            MARBLE SIZE HAIL AT I-55 AND LEMONT ROAD.

1030 PM     TSTM WND GST     MONEE                   41.42N 87.75W
08/22/2007  E40.00 MPH       WILL               IL   AMATEUR RADIO

1030 PM     FLOOD            ROMEOVILLE              41.65N 88.09W
08/22/2007                   WILL               IL   AMATEUR RADIO

            SIX TO EIGHT INCHES OF STANDING WATER ON ALEXANDER JUST
            NORTH OF ROUTE 53.

1033 PM     TSTM WND DMG     MOKENA                  41.53N 87.88W
08/22/2007                   WILL               IL   LAW ENFORCEMENT

            ONE TREE BLOWN DOWN AT ROUTE 30 AND WOLF ROAD.

1040 PM     TSTM WND DMG     BRIDGEVIEW              41.74N 87.81W
08/22/2007                   COOK               IL   AMATEUR RADIO

            POWER LINES DOWN AT ROUTE 83 AND RICHLAND.

1106 PM     FLASH FLOOD      CHICAGO                 41.88N 87.63W
08/22/2007                   COOK               IL   NEWSPAPER

            NORTHBOUND MICHIGAN AVE ENTRANCE TUNNEL TO NORTHBOUND
            LAKE SHORE DR IS FLOODED. CHICAGO POLICE ONSCENE.

1107 PM     TSTM WND DMG     CREST HILL              41.57N 88.11W
08/22/2007                   WILL               IL   AMATEUR RADIO

            4 INCH DIAMETER TREE DOWN ON GAYLORD JUST NORTH OF
            DIVISION

&&

The radar

The Chicago radar (KLOT), 35 km away, was scanning. The volume nearest the first event began at 11:01 UTC.

Open the radar archive at this moment

Event by event

87 thunderstorm wind, 29 flood, 12 flash flood, 4 hail, 3 heavy rain, 1 tornado. Local standard time, as filed.

Heavy Rain, Grundy

When
August 23, 5:00 AM CST to August 24, 5:00 AM CST
Where
Grundy County, 4 mi NNW of Coal City
Reported by
Official NWS Observations
Coordinates
41.333, -88.309

Measured 24 hour rainfall was 5.01 inches.

Heavy Rain, Will

When
August 23, 5:00 AM CST to August 24, 5:00 AM CST
Where
Will County, Channahon
Reported by
NWS Employee
Coordinates
41.430, -88.230

Measured 24 hour rainfall was 5.24 inches.

Heavy Rain, Cook

When
August 23, 6:00 AM CST to August 24, 6:00 AM CST
Where
Cook County, Burr Ridge
Reported by
Trained Spotter
Coordinates
41.750, -87.950

Measured 24 hour rainfall was 5.64 inches.

Thunderstorm Wind, Ogle

When
August 23, 12:41 PM CST
Where
Ogle County, Mt Morris
Measured
50 kt (58 mph) estimated gust
Crop damage
$5,000
Reported by
Fire Department/Rescue
Coordinates
42.050, -89.430

Tree limbs and crops blown down.

Thunderstorm Wind, Lee

When
August 23, 12:45 PM CST
Where
Lee County, Franklin Grove
Measured
55 kt (63 mph) estimated gust
Property damage
$5,000
Reported by
Fire Department/Rescue
Coordinates
41.830, -89.300

Utility poles blown down.

Thunderstorm Wind, La Salle

When
August 23, 1:15 PM CST
Where
La Salle County, Peru
Measured
55 kt (63 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.330, -89.130

Several large trees down blocking Shooting Park Road.

Thunderstorm Wind, La Salle

When
August 23, 1:15 PM CST
Where
La Salle County, 1 mi W of Peru
Measured
50 kt (58 mph) measured gust
Reported by
AWOS
Coordinates
41.330, -89.149

A gust to 58 mph was measured at the Illinois Valley Regional Airport, west of Peru.

Thunderstorm Wind, La Salle

When
August 23, 1:17 PM CST
Where
La Salle County, La Salle
Measured
55 kt (63 mph) estimated gust
Reported by
Public
Coordinates
41.330, -89.100

Several large trees down on Bucklin and Roosevelt Streets.

Flood, Ogle

When
August 23, 1:20 PM CST to 4:00 PM CST
Where
Ogle County, Rochelle
Cause
Heavy Rain
Reported by
COOP Observer
Coordinates
41.920, -89.070

Up to one foot of water on streets in low spots.

Thunderstorm Wind, La Salle

When
August 23, 1:24 PM CST
Where
La Salle County, Oglesby
Measured
60 kt (69 mph) estimated gust
Property damage
$25,000
Reported by
Law Enforcement
Coordinates
41.300, -89.070

A mobile home being hauled by a semi was blown over on Interstate 39, just north of the Olgesby exit.

Thunderstorm Wind, De Kalb

When
August 23, 1:26 PM CST
Where
De Kalb County, De Kalb
Measured
52 kt (60 mph) estimated gust
Crop damage
$5,000
Reported by
Trained Spotter
Coordinates
41.930, -88.750

Wind estimated to 60 mph with corn bent over.

Thunderstorm Wind, De Kalb

When
August 23, 1:30 PM CST
Where
De Kalb County, De Kalb
Measured
55 kt (63 mph) estimated gust
Property damage
$5,000
Reported by
Trained Spotter
Coordinates
41.930, -88.750

Utility poles blown down on Normal Street.

Thunderstorm Wind, La Salle

When
August 23, 1:35 PM CST
Where
La Salle County, Ottawa
Measured
60 kt (69 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.350, -88.850

Several large trees blown down on the north side of Ottawa.

Thunderstorm Wind, La Salle

When
August 23, 1:35 PM CST
Where
La Salle County, 2 mi N of Ottawa
Measured
61 kt (70 mph) measured gust
Reported by
Trained Spotter
Coordinates
41.379, -88.850

Measured gust to 70 mph.

Thunderstorm Wind, La Salle

When
August 23, 1:35 PM CST
Where
La Salle County, Ottawa
Measured
55 kt (63 mph) measured gust
Reported by
Public
Coordinates
41.350, -88.850

Measured gust to 63 mph.

Thunderstorm Wind, Grundy

When
August 23, 1:45 PM CST to 1:55 PM CST
Where
Grundy County, Morris to Coal City
Measured
60 kt (69 mph) estimated gust
Property damage
$100,000
Crop damage
$50,000
Reported by
Trained Spotter
Coordinates
41.370, -88.420

Ten inch diameter tree blown down blocking Southmor Road, south of Morris. Eight inch diameter tree blown down near Jewitt and Center Street. Several tree limbs and power lines blown down across Grundy County. Several 8 to 10 inch diameter tree limbs blown down and a 30 foot section of corn field flattened near Saratoga Road, one mile north of Interstate 80. Damage reported to power lines, structures and crops.

Thunderstorm Wind, Kane

When
August 23, 1:50 PM CST
Where
Kane County, Elburn
Measured
50 kt (58 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.880, -88.470

A tree was blown down on Francis Road.

Thunderstorm Wind, Grundy

When
August 23, 1:50 PM CST
Where
Grundy County, Morris
Measured
50 kt (58 mph) measured gust
Reported by
Emergency Manager
Coordinates
41.370, -88.420

A gust to 58 mph was measured near Shabonna and Southmor Roads just south of Morris.

Hail, Kane

When
August 23, 1:59 PM CST to 2:01 PM CST
Where
Kane County, Geneva
Measured
1 in hail
Reported by
Trained Spotter
Coordinates
41.880, -88.300

Quarter size hail reported at Main and Randall Roads.

Thunderstorm Wind, Kane

When
August 23, 2:00 PM CST
Where
Kane County, Geneva
Measured
65 kt (75 mph) estimated gust
Property damage
$50,000
Reported by
Trained Spotter
Coordinates
41.880, -88.300

Extensive tree and power line damage across Geneva.

Thunderstorm Wind, Kane

When
August 23, 2:00 PM CST
Where
Kane County, Elgin
Measured
65 kt (75 mph) estimated gust
Reported by
Public
Coordinates
42.030, -88.280

Estimated gust to 75 mph.

Thunderstorm Wind, Kane

When
August 23, 2:00 PM CST
Where
Kane County, Montgomery
Measured
56 kt (64 mph) estimated gust
Reported by
Public
Coordinates
41.730, -88.350

Estimated winds to 65 mph.

Thunderstorm Wind, Kane

When
August 23, 2:00 PM CST
Where
Kane County, Geneva
Measured
50 kt (58 mph) measured gust
Reported by
Mesonet
Coordinates
41.880, -88.300

Measured gust to 58 mph.

Thunderstorm Wind, Kane

When
August 23, 2:00 PM CST
Where
Kane County, West Dundee
Measured
65 kt (75 mph) estimated gust
Reported by
Newspaper
Coordinates
42.100, -88.280

Almost every street was littered with either tree limbs or full trees that were blown down. Large trees were uprooted in a cemetery.

Thunderstorm Wind, Kane

When
August 23, 2:02 PM CST
Where
Kane County, Batavia
Measured
54 kt (62 mph) measured gust
Reported by
Law Enforcement
Coordinates
41.850, -88.320

Measured gust to 62 mph.

Thunderstorm Wind, Du Page

When
August 23, 2:04 PM CST
Where
Du Page County, Dupage Co Arpt
Measured
58 kt (67 mph) measured gust
Reported by
ASOS
Coordinates
41.900, -88.250

Measured gust to 67 mph.

Thunderstorm Wind, Kane

When
August 23, 2:05 PM CST
Where
Kane County, Batavia
Measured
65 kt (75 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.850, -88.320

Significant tree damage across Batavia and Fabyan Park Preserve.

Thunderstorm Wind, Du Page

When
August 23, 2:05 PM CST
Where
Du Page County, West Chicago
Measured
65 kt (75 mph) estimated gust
Injuries
40 direct, 0 indirect
Property damage
$500,000
Reported by
Law Enforcement
Coordinates
41.880, -88.200

The roof of a warehouse above two of four loading docks, gave way. Forty people were injured, seven of which had to go the hospital.

Thunderstorm Wind, Kendall

When
August 23, 2:05 PM CST
Where
Kendall County, 6 mi ENE of Plattville
Measured
50 kt (58 mph) estimated gust
Reported by
NWS Employee
Coordinates
41.563, -88.273

A large tree limb was blown down on County Line Road between Renwick and Caton Farm Road in Kendall County.

Tornado, Du Page

When
August 23, 2:08 PM CST to 2:10 PM CST
Where
Du Page County, Winfield
Rating
EF1
Path length
2.67 mi
Path width
500 yd
Property damage
$15,000
Reported by
NWS Storm Survey
Coordinates
41.870, -88.170

A tornado touched down near Prince Crossing Road south of Geneva Road in Winfield. The tornado had a path length of 2.67 miles and a path width of 300 to 500 yards. The tornado lifted just west of Gary Avenue south of Geneva Road. The main damage from the tornado included several large uprooted hardwood trees. Shingles and power lines were also blown down.

Thunderstorm Wind, Kane

When
August 23, 2:09 PM CST
Where
Kane County, Aurora
Measured
65 kt (75 mph) estimated gust
Property damage
$20,000
Reported by
Newspaper
Coordinates
41.770, -88.320

A large tree was blown down and crushed a car at the corner of Jackson Street and Parker Avenue.

Thunderstorm Wind, Will

When
August 23, 2:10 PM CST
Where
Will County, Braidwood
Measured
50 kt (58 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.270, -88.220

Tree limbs blown down at Route 113 and West River Road.

Thunderstorm Wind, Du Page

When
August 23, 2:10 PM CST
Where
Du Page County, Winfield
Measured
55 kt (63 mph) estimated gust
Property damage
$25,000
Reported by
Law Enforcement
Coordinates
41.870, -88.170

Damage to a loading dock and parking garage eaves at Central Dupage Hospital.

Thunderstorm Wind, Cook

When
August 23, 2:10 PM CST
Where
Cook County, Streamwood
Measured
65 kt (75 mph) estimated gust
Property damage
$100,000
Reported by
Public
Coordinates
42.030, -88.170

Large trees down all over town, some on cars and houses.

Thunderstorm Wind, Du Page

When
August 23, 2:10 PM CST
Where
Du Page County, Bartlett
Measured
50 kt (58 mph) estimated gust
Reported by
Trained Spotter
Coordinates
42.000, -88.180

Large tree limbs blown down at Oak Avenue and Hillcrest.

Thunderstorm Wind, Du Page

When
August 23, 2:10 PM CST
Where
Du Page County, Wheaton
Measured
56 kt (64 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.870, -88.120

Estimated gust to 65 mph.

Thunderstorm Wind, Du Page

When
August 23, 2:10 PM CST
Where
Du Page County, 3 mi SE of Aurora
Measured
50 kt (58 mph) measured gust
Reported by
Mesonet
Coordinates
41.739, -88.279

Measured gust to 58 mph.

Thunderstorm Wind, Will

When
August 23, 2:10 PM CST to 2:12 PM CST
Where
Will County, Braidwood to Wilmington
Measured
52 kt (60 mph) estimated gust
Property damage
$20,000
Reported by
Trained Spotter
Coordinates
41.270, -88.220

Estimated gust to 60 mph. Numerous trees and tree limbs blown down. One tree was blown down onto a house in Wilmington.

Thunderstorm Wind, Cook

When
August 23, 2:10 PM CST
Where
Cook County, Streamwood
Measured
61 kt (70 mph) estimated gust
Reported by
Trained Spotter
Coordinates
42.030, -88.170

Estimated gust to 70 mph.

Thunderstorm Wind, Will

When
August 23, 2:14 PM CST
Where
Will County, Romeoville
Measured
58 kt (67 mph) measured gust
Reported by
Official NWS Observations
Coordinates
41.630, -88.070

Measured gust to 67 mph at the National Weather Service office.

Thunderstorm Wind, Du Page

When
August 23, 2:15 PM CST
Where
Du Page County, Wheaton
Measured
78 kt (90 mph) estimated gust
Reported by
Emergency Manager
Coordinates
41.870, -88.120

Numerous trees uprooted with an estimated wind gust to 90 mph at Dupage County EOC at Gary Avenue and Jewel Road.

Thunderstorm Wind, Du Page

When
August 23, 2:15 PM CST
Where
Du Page County, Winfield
Measured
60 kt (69 mph) estimated gust
Reported by
Public
Coordinates
41.870, -88.170

A 50 foot Douglas Fir tree had the top 25 feet sheared off which landed on a neighbors roof.

Thunderstorm Wind, Will

When
August 23, 2:15 PM CST
Where
Will County, Plainfield
Measured
60 kt (69 mph) estimated gust
Property damage
$25,000
Reported by
Emergency Manager
Coordinates
41.600, -88.200

Numerous reports of trees and utility poles blown down across western side of Will County.

Thunderstorm Wind, Will

When
August 23, 2:15 PM CST
Where
Will County, Crest Hill
Measured
55 kt (63 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.570, -88.150

A large tree was blown down at Sweetbriar Ave and Gaylord Road.

Thunderstorm Wind, Cook

When
August 23, 2:15 PM CST
Where
Cook County, Hoffman Estates
Measured
55 kt (63 mph) estimated gust
Reported by
Trained Spotter
Coordinates
42.050, -88.120

Large tree limbs blown down on Westbury Drive.

Thunderstorm Wind, Will

When
August 23, 2:15 PM CST
Where
Will County, Bolingbrook
Measured
60 kt (69 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.670, -88.130

Trees blown down at Green and Royce Roads.

Thunderstorm Wind, Will

When
August 23, 2:15 PM CST to 2:16 PM CST
Where
Will County, Joliet
Measured
59 kt (68 mph) measured gust
Reported by
Trained Spotter
Coordinates
41.530, -88.100

Measured gust to 68 mph at the intersection of Essington and Ann Streets. A large tree fell next to a house on Schriber Road. Tree limbs were blown down on Lilac Lane.

Thunderstorm Wind, Will

When
August 23, 2:15 PM CST
Where
Will County, Manhattan
Measured
70 kt (81 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.420, -87.980

Estimated gust to 80 mph at 183rd and Wolf Road.

Thunderstorm Wind, Du Page

When
August 23, 2:15 PM CST
Where
Du Page County, Wheaton
Measured
61 kt (70 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.870, -88.120

Estimated gust to 70 mph.

Thunderstorm Wind, Will

When
August 23, 2:15 PM CST
Where
Will County, New Lenox
Measured
65 kt (75 mph) estimated gust
Reported by
Public
Coordinates
41.520, -87.970

Large trees uprooted, estimated gust to 75 mph.

Thunderstorm Wind, Du Page

When
August 23, 2:16 PM CST to 2:18 PM CST
Where
Du Page County, Lombard to Villa Park
Measured
60 kt (69 mph) estimated gust
Property damage
$1.5 million
Reported by
Newspaper
Coordinates
41.880, -88.020

Numerous trees, tree limbs and power lines blown down. A garage door was blown in by the high winds, a roof was partially blown off, some trees fell onto houses. In Villa Park, at least 1,500 trees were either destroyed or heavily damaged and 2,000 structures in Villa Park were damaged.

Thunderstorm Wind, Cook

When
August 23, 2:18 PM CST
Where
Cook County, Arlington Hgts
Measured
65 kt (75 mph) estimated gust
Property damage
$50,000
Reported by
Newspaper
Coordinates
42.080, -88.000

A tree was uprooted on Seegers Road. Other tree and tree limbs were blown down and roof damage was also reported.

Thunderstorm Wind, Du Page

When
August 23, 2:20 PM CST
Where
Du Page County, Elmhurst
Measured
60 kt (69 mph) estimated gust
Injuries
3 direct, 2 indirect
Property damage
$100,000
Reported by
Trained Spotter
Coordinates
41.880, -87.950

Numerous trees, tree limbs and power lines were blown down. A woman was seriously injured when a tree fell on her car on Prairie Avenue. Another tree fell on car, injuring the driver at York Street and St. Charles Road. A tree was blown down onto a city vehicle on Fairview, where the driver was injured. Two other people were injured when they entered their flooded basements.

Thunderstorm Wind, Cook

When
August 23, 2:20 PM CST
Where
Cook County, Mt Prospect
Measured
70 kt (81 mph) estimated gust
Property damage
$100,000
Reported by
Newspaper
Coordinates
42.070, -87.930

City officials estimated that as many as 2,500 trees suffered damage or were completed blown down. An education wing of a church was severely damaged.

Thunderstorm Wind, Cook

When
August 23, 2:20 PM CST
Where
Cook County, Schaumburg
Measured
60 kt (69 mph) estimated gust
Property damage
$50,000
Reported by
Newspaper
Coordinates
42.030, -88.080

A roof of a car repair shop was blown off on Estes Avenue and another building on Lunt Avenue also suffered roof damage.

Thunderstorm Wind, Du Page

When
August 23, 2:20 PM CST
Where
Du Page County, Bloomingdale
Measured
55 kt (63 mph) estimated gust
Deaths
1 direct, 0 indirect
Reported by
Newspaper
Coordinates
41.950, -88.080

A man was struck by a falling tree limb on a golf course and died from his injuries.

Thunderstorm Wind, Will

When
August 23, 2:20 PM CST
Where
Will County, Frankfort
Measured
55 kt (63 mph) estimated gust
Property damage
$5,000
Reported by
Newspaper
Coordinates
41.500, -87.850

Two utility poles were blown over on 80th Avenue.

Thunderstorm Wind, Cook

When
August 23, 2:21 PM CST
Where
Cook County, Des Plaines
Measured
65 kt (75 mph) estimated gust
Property damage
$300,000
Reported by
Trained Spotter
Coordinates
42.030, -87.900

Extensive tree damage city wide. Damage to cars, roofs, and fences. Powerlines also blown down.

Thunderstorm Wind, Cook

When
August 23, 2:23 PM CST
Where
Cook County, Des Plaines
Measured
52 kt (60 mph) estimated gust
Reported by
Trained Spotter
Coordinates
42.030, -87.900

Estimated gust to 60 mph.

Thunderstorm Wind, Cook

When
August 23, 2:24 PM CST
Where
Cook County, Orland Park
Measured
56 kt (64 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.630, -87.870

Estimated gust to 65 mph.

Thunderstorm Wind, Cook

When
August 23, 2:25 PM CST
Where
Cook County, Elk Grove Vlg
Measured
65 kt (75 mph) estimated gust
Property damage
$25,000
Reported by
Trained Spotter
Coordinates
42.020, -87.980

Large trees blown down, some 12 inches in diameter. Siding also blown off houses.

Thunderstorm Wind, Will

When
August 23, 2:25 PM CST
Where
Will County, Mokena
Measured
52 kt (60 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.530, -87.880

Estimated gust to 60 mph.

Thunderstorm Wind, Cook

When
August 23, 2:25 PM CST
Where
Cook County, Forest Park
Measured
60 kt (69 mph) estimated gust
Property damage
$25,000
Reported by
Newspaper
Coordinates
41.850, -87.780

Numerous tree limbs blown down. Three cars were damaged by falling tree limbs on DesPlaines Avenue.

Thunderstorm Wind, Cook

When
August 23, 2:26 PM CST
Where
Cook County, (Ord)o'Hare Intl Arp
Measured
50 kt (58 mph) measured gust
Reported by
ASOS
Coordinates
41.980, -87.900

Gust to 58 mph measured at O'hare Airport.

Thunderstorm Wind, Cook

When
August 23, 2:28 PM CST
Where
Cook County, Chicago
Measured
60 kt (69 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.830, -87.650

Large trees and tree limbs blown down at Diversey and Harlem on the north side of Chicago.

Thunderstorm Wind, Cook

When
August 23, 2:30 PM CST
Where
Cook County, Chicago
Measured
60 kt (69 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.830, -87.650

A tree was blown down on a house on Laramie Avenue. Other significant tree damage near Jefferson Park neighborhood on the northwest side.

Thunderstorm Wind, Cook

When
August 23, 2:30 PM CST
Where
Cook County, 2 mi NE of Bedford Park
Measured
65 kt (75 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.791, -87.723

Two large trees, each two feet in diameter, snapped off at their base.

Thunderstorm Wind, Cook

When
August 23, 2:30 PM CST
Where
Cook County, Palos Hgts
Measured
52 kt (60 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.670, -87.800

Estimated gust to 60 mph at 127th and Harlem.

Thunderstorm Wind, Cook

When
August 23, 2:30 PM CST
Where
Cook County, Glenview
Measured
60 kt (69 mph) estimated gust
Injuries
1 direct, 0 indirect
Property damage
$50,000
Reported by
Newspaper
Coordinates
42.070, -87.800

A large tree was blown down onto a vehicle near Lyons School. The vehicle was destroyed. A three year old girl was trapped inside but suffered only minor injuries. Numerous other trees, tree limbs and power lines were blown down.

Thunderstorm Wind, Cook

When
August 23, 2:30 PM CST
Where
Cook County, Oak Forest
Measured
65 kt (75 mph) estimated gust
Property damage
$30,000
Reported by
Newspaper
Coordinates
41.600, -87.750

A tree was blown down onto a pickup truck, a boat and a garage.

Thunderstorm Wind, Will

When
August 23, 2:32 PM CST
Where
Will County, Steger
Measured
65 kt (75 mph) estimated gust
Property damage
$50,000
Reported by
Emergency Manager
Coordinates
41.470, -87.630

A roof was blown off a building near Sauk Trail and Cicero Avenue.

Thunderstorm Wind, Cook

When
August 23, 2:32 PM CST
Where
Cook County, Midlothian
Measured
64 kt (74 mph) measured gust
Reported by
Trained Spotter
Coordinates
41.620, -87.720

Measured gust to 74 mph. Twelve inch diameter tree limbs blown down.

Thunderstorm Wind, Cook

When
August 23, 2:32 PM CST
Where
Cook County, Wilmette
Measured
70 kt (81 mph) estimated gust
Reported by
Newspaper
Coordinates
42.070, -87.680

Over 1,000 trees were either uprooted, blown over, or suffered some kind of damage. At least 76 trees, including some 25 to 30 inches in diameter, were blown down at a golf course.

Thunderstorm Wind, Cook

When
August 23, 2:34 PM CST
Where
Cook County, Oak Park
Measured
60 kt (69 mph) estimated gust
Reported by
Public
Coordinates
41.900, -87.770

Several large trees blown down in Oak Park.

Thunderstorm Wind, Will

When
August 23, 2:34 PM CST
Where
Will County, Crete
Measured
50 kt (58 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.450, -87.630

A six inch diameter tree was blown down.

Thunderstorm Wind, Cook

When
August 23, 2:35 PM CST
Where
Cook County, Morton Grove
Measured
60 kt (69 mph) estimated gust
Reported by
Trained Spotter
Coordinates
42.030, -87.770

Multiple large trees blown down in a residential area near Golf Road and Shermer Road.

Thunderstorm Wind, Kankakee

When
August 23, 2:35 PM CST
Where
Kankakee County, Manteno
Measured
50 kt (58 mph) estimated gust
Property damage
$2,000
Reported by
Emergency Manager
Coordinates
41.250, -87.830

A light pole was blown down.

Thunderstorm Wind, Cook

When
August 23, 2:35 PM CST
Where
Cook County, Olympia Fields
Measured
60 kt (69 mph) estimated gust
Property damage
$20,000
Reported by
Emergency Manager
Coordinates
41.520, -87.700

Multiple large trees blown down. A semi trailer was blown over at 83rd and the Tri-state Tollway.

Thunderstorm Wind, Cook

When
August 23, 2:35 PM CST
Where
Cook County, Evergreen Park
Measured
55 kt (63 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.720, -87.670

A tree was blown down on Pavilion.

Thunderstorm Wind, Cook

When
August 23, 2:35 PM CST
Where
Cook County, Matteson
Measured
65 kt (75 mph) estimated gust
Property damage
$15,000
Reported by
Emergency Manager
Coordinates
41.500, -87.700

Roof damage to a business building. Power lines also blown down.

Thunderstorm Wind, Cook

When
August 23, 2:35 PM CST
Where
Cook County, Northbrook
Measured
57 kt (66 mph) measured gust
Reported by
Mesonet
Coordinates
42.130, -87.830

Measured gust to 66 mph.

Thunderstorm Wind, Cook

When
August 23, 2:35 PM CST
Where
Cook County, Northbrook
Measured
50 kt (58 mph) estimated gust
Reported by
Amateur Radio
Coordinates
42.130, -87.830

Large tree limbs blown down.

Thunderstorm Wind, Cook

When
August 23, 2:35 PM CST
Where
Cook County, Matteson
Measured
60 kt (69 mph) estimated gust
Property damage
$10,000
Reported by
Trained Spotter
Coordinates
41.500, -87.700

Tree and roof damage reported.

Flood, Du Page

When
August 23, 2:39 PM CST to 4:00 PM CST
Where
Du Page County, Downers Grove
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.800, -88.000

Three to four inches of water on Main Street between 63rd and 55th Streets.

Thunderstorm Wind, Cook

When
August 23, 2:40 PM CST
Where
Cook County, Chicago
Measured
60 kt (69 mph) estimated gust
Property damage
$10,000
Reported by
Public
Coordinates
41.830, -87.650

Windows blown out at the Chicago Historical Society near Fullerton and Lake Shore Drive.

Thunderstorm Wind, Cook

When
August 23, 2:40 PM CST
Where
Cook County, Chicago
Measured
64 kt (74 mph) measured gust
Deaths
1 direct, 0 indirect
Property damage
$100,000
Reported by
Mesonet
Coordinates
41.830, -87.650

Measured gust to 74 mph near Wrigley Field. A cinder block wall was blown down near Wrigley Field. Debris from this wall fell onto a man and crushed him. The man died one week later from his injuries.

Thunderstorm Wind, Cook

When
August 23, 2:40 PM CST
Where
Cook County, Chicago
Measured
52 kt (60 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.830, -87.650

Sixteen inch diameter tree down on North Fairfield, on the north side of Chicago. Estimated wind gust to 60 mph.

Thunderstorm Wind, Kankakee

When
August 23, 2:42 PM CST
Where
Kankakee County, Bourbonnais
Measured
60 kt (69 mph) estimated gust
Injuries
3 direct, 0 indirect
Property damage
$500,000
Reported by
Trained Spotter
Coordinates
41.150, -87.880

Several houses received minor wind damage with five homes suffering significant damage. Numerous trees, tree limbs and power lines were blown down. Three people suffered minor injuries from flying debris. One man was injured when part of a roof landed on his vehicle.

Flood, Cook

When
August 23, 3:00 PM CST to 5:00 PM CST
Where
Cook County, Chicago
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.830, -87.650

Standing water in the left lane of Interstate 94 at 130th on the far south side of Chicago.

Flood, Ogle

When
August 23, 3:14 PM CST to 6:00 PM CST
Where
Ogle County, Oregon
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
42.020, -89.330

Water above a house foundation.

Flash Flood, Ogle

When
August 23, 3:14 PM CST to 6:00 PM CST
Where
Ogle County, Rochelle
Cause
Heavy Rain
Reported by
Law Enforcement
Coordinates
41.920, -89.070

Creek overflowing with two to three inches of water flowing across Interstate 88 near mile marker 89.

Thunderstorm Wind, Kane

When
August 23, 4:10 PM CST
Where
Kane County, Elgin
Measured
50 kt (58 mph) estimated gust
Reported by
Trained Spotter
Coordinates
42.030, -88.280

Six inch diameter tree blown down in the road at Arlington and Regent Streets.

Hail, Kane

When
August 23, 4:11 PM CST to 4:13 PM CST
Where
Kane County, Elgin
Measured
0.88 in hail
Reported by
Trained Spotter
Coordinates
42.030, -88.280

Quarter size hail reported at Route 31 and Interstate 90.

Flood, Kane

When
August 23, 4:12 PM CST to 7:00 PM CST
Where
Kane County, West Dundee
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
42.100, -88.280

Water eight inches deep, curb to curb on Randall Road north of Interstate 90.

Flash Flood, De Kalb

When
August 23, 4:30 PM CST to 9:00 PM CST
Where
De Kalb County, De Kalb
Cause
Heavy Rain
Property damage
$500,000
Reported by
Trained Spotter
Coordinates
41.930, -88.750

Kishwaukee River flooding houses and apartments.

Flash Flood, Kane

When
August 23, 4:40 PM CST to 7:00 PM CST
Where
Kane County, Elgin
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
42.030, -88.280

Storm and sewer grates dislodged by flowing water at Route 20 and St. Charles. Eight inches of water at Irving Park Road near Route 25.

Thunderstorm Wind, Du Page

When
August 23, 5:00 PM CST
Where
Du Page County, Glen Ellyn
Measured
55 kt (63 mph) estimated gust
Reported by
Public
Coordinates
41.880, -88.070

A large tree was blown down near Shorewood subdivision.

Flash Flood, Du Page

When
August 23, 5:17 PM CST to 8:00 PM CST
Where
Du Page County, Bartlett
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
42.000, -88.180

Street flooding at Mayflower Lane north of Schick Road.

Flood, Kane

When
August 23, 5:20 PM CST to 7:30 PM CST
Where
Kane County, Geneva
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.880, -88.300

Some street and yard flooding with 0.78 inches of rain in 40 minutes.

Flash Flood, La Salle

When
August 23, 5:25 PM CST to 8:00 PM CST
Where
La Salle County, Ottawa
Cause
Heavy Rain
Property damage
$250,000
Reported by
Trained Spotter
Coordinates
41.350, -88.850

Several inches of flowing water over Route 23 in and north of Ottawa. Flash flooding occurred in Utica as Clark Run Creek overflowed its banks sending floodwaters down the main part of town. According to reports, about 45 residents responded to a request for evacuation. Widespread basement flooding was reported in the Peru-La Salle areas. Many streets and county roads flooded within La Salle County. Flash flooding was also reported in Triumph, Naplate, and Grand Ridge in La Salle County. Dee Bennet Road near Buffalo Rock State park was closed due to flooding. Portions of Route 178 were also closed.

Flood, La Salle

When
August 23, 5:30 PM CST to 7:00 PM CST
Where
La Salle County, Ottawa
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.350, -88.850

Four inches of water over Route 23.

Flood, Du Page

When
August 23, 5:35 PM CST to 7:30 PM CST
Where
Du Page County, Willowbrook
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.750, -87.970

Street flooding reported at Route 83 and 31st, one lane open.

Thunderstorm Wind, Grundy

When
August 23, 5:44 PM CST
Where
Grundy County, 2 mi W of Morris
Measured
54 kt (62 mph) measured gust
Property damage
$25,000
Reported by
Emergency Manager
Coordinates
41.370, -88.459

Cars were reported blown off a road north of Morris. A 62 mph gust was measured at Route 6 and Saratoga, two miles west of Morris.

Flood, Grundy

When
August 23, 5:45 PM CST to 8:00 PM CST
Where
Grundy County, Morris
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.370, -88.420

Six inches of water over Route 47 at the Illinois River Bridge.

Flood, Du Page

When
August 23, 5:52 PM CST to 8:00 PM CST
Where
Du Page County, Warrenville
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.820, -88.170

Several roads with water knee deep in spots.

Flash Flood, Will

When
August 23, 6:00 PM CST to 9:00 PM CST
Where
Will County, Bolingbrook
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.670, -88.130

Three feet of water on Joliet Road beneath the Interstate 55 overpass.

Thunderstorm Wind, Cook

When
August 23, 6:03 PM CST
Where
Cook County, Midlothian
Measured
56 kt (64 mph) estimated gust
Reported by
Trained Spotter
Coordinates
41.620, -87.720

Estimated gust to 65 mph at 147th and Cicero.

Flood, Du Page

When
August 23, 6:05 PM CST to 7:30 PM CST
Where
Du Page County, Lombard
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.880, -88.020

Three inches of standing water on Interstate 355 at St. Charles Road.

Flood, Will

When
August 23, 6:05 PM CST to 8:00 PM CST
Where
Will County, Crest Hill
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.570, -88.150

Intersection of Route 30 and Larkin flooded.

Flood, Will

When
August 23, 6:05 PM CST to 8:00 PM CST
Where
Will County, Joliet
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.530, -88.100

Three to four inches of standing water on Cherry Hill Road at Route 52.

Flash Flood, Kane

When
August 23, 6:06 PM CST to 8:00 PM CST
Where
Kane County, Elburn
Cause
Heavy Rain
Reported by
Public
Coordinates
41.880, -88.470

Water flowing over roads.

Thunderstorm Wind, Will

When
August 23, 6:25 PM CST
Where
Will County, 3 mi S of Wilmington
Measured
55 kt (63 mph) estimated gust
Reported by
Law Enforcement
Coordinates
41.277, -88.150

Trees were blown down at Route 102 and 113.

Flood, Will

When
August 23, 6:30 PM CST to 9:00 PM CST
Where
Will County, 1 mi S of Crete
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.435, -87.630

Four to six inches of water on Crete Monee Road near Route 1.

Hail, Kankakee

When
August 23, 6:44 PM CST to 6:46 PM CST
Where
Kankakee County, Bourbonnais
Measured
1 in hail
Reported by
Trained Spotter
Coordinates
41.150, -87.880

Flood, Cook

When
August 23, 6:48 PM CST to 9:00 PM CST
Where
Cook County, Streamwood
Cause
Heavy Rain
Reported by
Public
Coordinates
42.030, -88.170

Flooding on many roads with water eight to ten inches deep on parts of Park Blvd.

Hail, Kankakee

When
August 23, 6:56 PM CST to 6:58 PM CST
Where
Kankakee County, Bradley
Measured
0.75 in hail
Reported by
Trained Spotter
Coordinates
41.130, -87.870

Flood, Cook

When
August 23, 7:00 PM CST to 10:00 PM CST
Where
Cook County, Tinley Park
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.580, -87.780

Four inches of water covering a road.

Flood, Cook

When
August 23, 7:02 PM CST to 9:00 PM CST
Where
Cook County, Park Forest
Cause
Heavy Rain
Reported by
Trained Spotter
Coordinates
41.480, -87.680

One foot of standing water in a low spot on Western Avenue.

Thunderstorm Wind, Grundy

When
August 23, 7:12 PM CST
Where
Grundy County, Morris
Measured
55 kt (63 mph) estimated gust
Reported by
Law Enforcement
Coordinates
41.370, -88.420

Two trees blown down on Cemetary Road.

Flash Flood, Lee

When
August 23, 7:57 PM CST to August 24, 12:00 AM CST
Where
Lee County, Amboy to Compton
Cause
Heavy Rain
Reported by
Law Enforcement
Coordinates
41.720, -89.330

Various roads closed across the county.

Flash Flood, Ogle

When
August 23, 8:00 PM CST to August 24, 12:00 AM CST
Where
Ogle County, Oregon to Creston
Cause
Heavy Rain
Reported by
Law Enforcement
Coordinates
42.020, -89.330

Several roads closed due to flooding across Ogle County.

Flash Flood, De Kalb

When
August 23, 8:02 PM CST to 11:00 PM CST
Where
De Kalb County, Sycamore
Cause
Heavy Rain
Reported by
Law Enforcement
Coordinates
41.980, -88.680

Many streets closed due to flooding in Mayfield, South Grove, Sycamore.

Flood, Will

When
August 23, 8:12 PM CST to 11:00 PM CST
Where
Will County, Peotone
Cause
Heavy Rain
Property damage
$25,000
Reported by
Amateur Radio
Coordinates
41.330, -87.780

Minor street and basement flooding with storm total rainfall of 4.61 inches.

Flood, Grundy

When
August 23, 8:21 PM CST to 10:30 PM CST
Where
Grundy County, Carbon Hill to Diamond
Cause
Heavy Rain
Reported by
Law Enforcement
Coordinates
41.300, -88.300

Water ponding on roadways across the county including Carbon Hill, Coal City and Diamond.

Flood, Kendall

When
August 23, 8:21 PM CST to 11:00 PM CST
Where
Kendall County, Yorkville
Cause
Heavy Rain
Reported by
Law Enforcement
Coordinates
41.630, -88.450

Water on many roadways across the county.

Flood, La Salle

When
August 23, 8:21 PM CST to August 24, 2:00 AM CST
Where
La Salle County, Ottawa
Cause
Heavy Rain
Reported by
Law Enforcement
Coordinates
41.350, -88.850

Covel Creek affecting homes near Route 23 south of Ottawa. Water on roadways throughout the county, 4.51 inches of rain since 10 am on August 23rd.

Flood, Will

When
August 23, 8:21 PM CST to 11:00 PM CST
Where
Will County, Plainfield
Cause
Heavy Rain
Reported by
Law Enforcement
Coordinates
41.600, -88.200

Fifteen to eighteen inches of water on Route 126 and County Line Road.

Flood, Will

When
August 23, 8:21 PM CST to 11:00 PM CST
Where
Will County, New Lenox
Cause
Heavy Rain
Reported by
Law Enforcement
Coordinates
41.520, -87.970

Cedar and Michael Drive flooded.

Flash Flood, De Kalb

When
August 23, 8:55 PM CST to August 24, 1:00 AM CST
Where
De Kalb County, De Kalb
Cause
Heavy Rain
Property damage
$500,000
Reported by
Trained Spotter
Coordinates
41.930, -88.750

Extensive flooding of buildings at the Northern Illinois Univeristy campus.

Flash Flood, Will

When
August 23, 9:30 PM CST to August 24, 2:00 AM CST
Where
Will County, Wilmington
Cause
Heavy Rain
Property damage
$15,000
Reported by
Newspaper
Coordinates
41.320, -88.150

A car drove into flood waters on Ballou Road near Forked Creek and was submerged to the roof of the car. One of the three occupants swam to dry ground to get help. The other two occupants were rescued several hours later.

Flood, Lake

When
August 23, 9:45 PM CST to August 27, 1:30 AM CST
Where
Lake County, Russell to Gurnee
Cause
Heavy Rain
Property damage
$100,000
Reported by
Emergency Manager
Coordinates
42.480, -87.920

Heavy rainfall over the upper part of the Des Plaines watershed in Wisconsin combined with well above normal precipitation over portions of Lake County Illinois brought the parts of Des Plaines River into flood by August 20th. Additional rains on August 23rd resulted in crests during the following 3 days from points at Russell and Gurnee. Water inundated some homes along the river near Russell between the river and Kilbourne Road. Downstream at Gurnee, volunteers sandbagged around the Gurnee Grade School to prevent floodwaters from damaging the structure. Flood waters inundated large areas of forest preserve along the river. Elsewhere in Gurnee flooding closed portions of Old Grand Avenue as well as Emerald Avenue and Kilbourne Road. Sandbags were placed in front of several businesses along Old Grand Avenue. In North Libertyville Estates, a floodwall designed to hold flood waters from the Des Plaines River at bay, appeared to work as the area remained dry. In Libertyville, the Libertyville Golf Course at Riverside Park was flooded. The river crested at 10.55 feet at Russell on the 24th and at 9.82 feet on the evening of the 25th. High flows from near record flooding on the Fox River in Wisconsin were also moving downstream. These high flows, combined with excessive runoff over northern Illinois resulted in widespread flooding along the Fox River in the Chain of Lakes area. Homes in Antioch were surrounded by flood waters and many roads were closed. Most piers were under water and sandbagging efforts were ongoing.

Flood, De Kalb

When
August 23, 11:00 PM CST to August 25, 12:00 PM CST
Where
De Kalb County, De Kalb to Sycamore
Cause
Heavy Rain
Property damage
$1.0 million
Reported by
Broadcast Media
Coordinates
41.930, -88.750

After flash flooding from heavy rainfall on the evening of August 23rd, significant flooding continued across parts of central DeKalb County as rivers and streams overflowed their banks and flood waters took days to subside. During the morning of August 24th, Route 30 and 1st Street were impassable. A mobile home park was evacuated due to flood waters and Highway 64 was flooded with two feet of standing water. Flood waters inundated the Northern Illinois University campus and surrounding areas. Levees on campus were overtopped as water levels rose. Students from NIU helped sandbag in an attempt to hold back floodwaters. Roads and streets were closed due to flooding throughout DeKalb county and most schools were closed on the following Friday. Rescue workers evacuated residents from the Evergreen Village Mobile home Park on the east side of Sycamore as floodwaters inundated the entire area. Further downstream large areas flooded along the Kishwaukee River in the New Milford area. Campgrounds were inundated as well as streets and secondary roads. During the morning of August 24, Bethany Road was the only road crossing over the Kishwaukee River that was open to traffic. All other east-west road crossings had been closed. In total some 400 to 600 residents were displaced due to the flooding of the Kishwaukee River. The South Branch Kishwaukee River at DeKalb crested at 15.34 feet, the second highest crest on record. Storm total rainfall amounts included 4.85 inches in DeKalb, 3.50 inches in Waterman and 2.62 inches in Genoa.

Flood, Kane

When
August 23, 11:00 PM CST to August 25, 11:00 PM CST
Where
Kane County, Algonquin to Montgomery
Cause
Heavy Rain
Property damage
$5.0 million
Reported by
NWS Storm Survey
Coordinates
42.170, -88.280

Significant flooding occurred along the Fox River throughout Kane County, In East Dundee, Richardson Subdivision was particularly hit hard by the flooding. In South Elgin, some of the hardest hit areas included South River Street, North Water Street, Arthur Avenue, Josephine Avenue, Ross Avenue, and Mavis Avenue. 10 Families were evacuated in Elgin as flood waters continued to rise on August 24th. Bike paths and other green space along the river were inundated. Another area affected included the Valley View Subdivision in St Charles. Kane County officials estimated that flooding damaged more than 600 homes and businesses, and forced at least 80 residents from their homes. Flooding also occurred to 15 homes along the river’s west bank in Montgomery. Reports indicated that floodwaters affected backyards, garages, and basements of homes just south of the Ashland Avenue Bridge.

Flood, La Salle

When
August 24, 12:00 AM CST to August 25, 12:00 AM CST
Where
La Salle County, Wedron to Ottawa
Cause
Heavy Rain
Property damage
$1.0 million
Reported by
Newspaper
Coordinates
41.430, -88.780

Heavy rain throughout the month over southern Wisconsin and northern Illinois caused the Fox River to crest at 17.33 feet at Dayton on August 24. This was more than 5 feet above flood stage. Basements and garages were flooded along the river in Wedron and Ottawa.

Flood, Cook

When
August 24, 7:00 AM CST to August 25, 7:00 AM CST
Where
Cook County, Des Plaines
Cause
Heavy Rain
Property damage
$100,000
Reported by
Emergency Manager
Coordinates
42.030, -87.900

Heavy rainfall over the upper part of the Des Plaines watershed in Wisconsin combined with well above normal precipitation over portions of Lake County Illinois brought the parts of Des Plaines River in flood by August 20th. The additional rains on August 23rd resulted in a crest of 8.62 feet the following evening at Des Plaines. In Des Plaines, flooding inundated the Methodist Campground. Many streets were affected by floodwaters and some homes on Big Bend Drive and Junior Terrace were surrounded by flood waters.

Flood, Grundy

When
August 24, 11:00 AM CST to August 25, 12:00 PM CST
Where
Grundy County, Morris to Coal City
Cause
Heavy Rain
Property damage
$2.1 million
Crop damage
$500,000
Reported by
Emergency Manager
Coordinates
41.370, -88.420

Following a week of heavy rainfall and a storm event rainfall of nearly five inches, significant flooding occurred in the northern two thirds of Grundy County on August 24th, as runoff worked it's way to ditches and streams that quickly overtopped their banks, followed by flooding along larger streams and the Illinois River. Hundreds of basements filled with water, one rehabiliation center was evacuated in Morris, while a berm was built around the Morris hospital to protect the structure and prevent an evacuation and shutdown of that facility. Local officials used more than 22,000 sandbags in an attempt to protect numerous structures from the rushing water. In other locations, piles of gravel were used to divert the flow of water. Many crops were damaged by flowing floodwaters or mud left on plants after the floodwaters receded. An apartment complex was evacuated in Tudor Park due to flooding.

The people who died

As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.

EventDateAgeSexWhereKind
Thunderstorm Wind, Du Page2007-08-2367MaleGolfingDirect
Thunderstorm Wind, Cook2007-09-0121MaleOutside/Open AreasDirect

What these are

Heavy Rain
Rainfall totals unusual for the place and season that did not produce a flood.
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.
Flood
Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
Hail
Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
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.
Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

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

The same day elsewhere

More

Every storm in Illinois in 2007Every state in 2007This day in weather historyThe tornado archive for Illinois, 2007Warnings in Illinois, August 2007

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: 56622, 56623, 56624, 54985, 54986, 54988, 55039, 55198, 56555, 54990, 54991, 54992, 55014, 55172, 55173, 55030, 54993, 55038, 55167, 55002, 55178, 55195, 55199, 56654, 55174, 55176, 54989, 54995, 54998, 55252, 56776, 54987, 54999, 55005, 55013, 55171, 55177, 55179, 55182, 55181, and more.