A line of severe thunderstorms moved across northern Illinois during the late evening of June 20th and the early morning of June 21st producing wind damage and three tornadoes.

Thunderstorm Wind in KANE, ILLINOIS
From 20-JUN-21 21:46:00 to 20-JUN-21 21:46:00 (CST-6)
Location: (ARR) AURORA MUNICIPAL AIRPORT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in COOK, ILLINOIS
From 20-JUN-21 21:51:00 to 20-JUN-21 21:51:00 (CST-6)
Location: (O6C) SCHAUMBURG REGIONAL AIRPORT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in DE KALB, ILLINOIS
From 20-JUN-21 21:22:00 to 20-JUN-21 21:22:00 (CST-6)
Location: HINCKLEY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree damage was reported along Somonauk Road near Hinckley.

Thunderstorm Wind in KANE, ILLINOIS
From 20-JUN-21 21:50:00 to 20-JUN-21 21:50:00 (CST-6)
Location: MONTGOMERY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree damage was reported near Galena Boulevard and Canterbury Road.

Thunderstorm Wind in DU PAGE, ILLINOIS
From 20-JUN-21 22:15:00 to 20-JUN-21 22:16:00 (CST-6)
Location: DOWNERS GROVE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several trees were blown down in Downers Grove.

Thunderstorm Wind in DU PAGE, ILLINOIS
From 20-JUN-21 22:17:00 to 20-JUN-21 22:18:00 (CST-6)
Location: WESTMONT
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several trees were blown down in Westmont.

Thunderstorm Wind in COOK, ILLINOIS
From 20-JUN-21 22:10:00 to 20-JUN-21 22:10:00 (CST-6)
Location: OAK PARK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tree damage was reported.

Flood in DU PAGE, ILLINOIS
From 20-JUN-21 22:30:00 to 21-JUN-21 01:30:00 (CST-6)
Location: ELMHURST
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Ramp flooding was reported at the interchange of Interstate 290 and North Avenue.

Flood in COOK, ILLINOIS
From 20-JUN-21 22:15:00 to 21-JUN-21 01:30:00 (CST-6)
Location: ELK GROVE VILLAGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Standing water covered two lanes of Interstate 290 at Devon Avenue.  One vehicle was stalled.

Flood in COOK, ILLINOIS
From 20-JUN-21 22:40:00 to 21-JUN-21 01:30:00 (CST-6)
Location: BRIGHTON PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flooding blocked two lanes of Interstate 55 near Pulaski Avenue.

Thunderstorm Wind in COOK, ILLINOIS
From 20-JUN-21 22:06:00 to 20-JUN-21 22:06:00 (CST-6)
Location: ALBANY PARK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tree damage was reported in Albany Park.

Thunderstorm Wind in KANE, ILLINOIS
From 20-JUN-21 21:46:00 to 20-JUN-21 21:50:00 (CST-6)
Location: KANEVILLE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees were blown down between Kaneville and North Aurora.

Thunderstorm Wind in WILL, ILLINOIS
From 20-JUN-21 22:10:00 to 20-JUN-21 22:10:00 (CST-6)
Location: BOLINGBROOK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tree damage was reported in Bolingbrook.

Thunderstorm Wind in WILL, ILLINOIS
From 20-JUN-21 22:05:00 to 20-JUN-21 22:05:00 (CST-6)
Location: PLAINFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tree damage was reported on the northwest side of Plainfield.

Thunderstorm Wind in WILL, ILLINOIS
From 20-JUN-21 22:06:00 to 20-JUN-21 22:08:00 (CST-6)
Location: PLAINFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Sporadic minor tree damage consistent with straight line winds occurred in the vicinity of Meadow Lane between 143rd Street and Lockport Street, east to Route 59.

Thunderstorm Wind in LEE, ILLINOIS
From 20-JUN-21 21:16:00 to 20-JUN-21 21:16:00 (CST-6)
Location: STEWARD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Photos shared on social media showed two small trees snapped in half.

Tornado in WILL, ILLINOIS
From 20-JUN-21 22:08:00 to 20-JUN-21 22:14:00 (CST-6)
Location: PLAINFIELD
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado with peak winds of 85 mph touched down near the intersection of Route 59 and Route 126, just north of downtown Plainfield.  Numerous large tree limbs and a few trees were blown down in a neighborhood south of Route 126 and north of Lockport Street.  A tree limb was impaled into a home on Hawthorn Circle.  Minor tree damage occurred in the Lake Renwick Preserve.  The tornado crossed Interstate 55 with a path of sporadic tree damage in the Fieldstone neighborhood of Romeoville near Helen Drive.   Tree damage occurred in the Mistwood Golf Club including tree limbs removed from the top of trees.  A narrow path of concentrated tree damage occurred near Rosemarie Lane.  The tornado lifted in the vicinity of Thomas Drive just east of Weber Road.

Tornado in COOK, ILLINOIS
From 20-JUN-21 22:21:00 to 20-JUN-21 22:25:00 (CST-6)
Location: BURR RIDGE
Tornado F-scale: EF3
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado which touched down in Naperville and moved across far southern DuPage County crossed into Cook County near 83rd Street.  The tornado produced only tree damage along its path in Cook County and the tornado ended near the Buffalo Woods just east of Forest Avenue.

Thunderstorm Wind in DU PAGE, ILLINOIS
From 20-JUN-21 21:52:00 to 20-JUN-21 21:52:00 (CST-6)
Location: ADDISON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The roof and gutter of a house were damaged by a fallen tree.  Numerous tree limbs were blown down nearby.

Tornado in DU PAGE, ILLINOIS
From 20-JUN-21 21:54:00 to 20-JUN-21 21:55:00 (CST-6)
Location: ADDISON
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Based on an eyewitness account and damage seen during an NWS storm survey, it was determined a brief tornado with peak winds of 70 mph touched down at the intersection of Lake Street and Villa Avenue.  The tornado was on the ground for less than one minute and produced sporadic tree damage along its track.  A gazebo was lifted and flipped over a fence.  The tornado ended near McNair Avenue.

Heavy Rain in COOK, ILLINOIS
From 20-JUN-21 21:37:00 to 20-JUN-21 22:37:00 (CST-6)
Location: MT PROSPECT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rainfall of 3.16 inches was measured in about an hour.

Heavy Rain in DU PAGE, ILLINOIS
From 20-JUN-21 20:20:00 to 20-JUN-21 21:30:00 (CST-6)
Location: WAYNE CENTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Rainfall of 2.10 inches was measured in 70 minutes.

Thunderstorm Wind in COOK, ILLINOIS
From 20-JUN-21 22:40:00 to 20-JUN-21 22:40:00 (CST-6)
Location: ELSDON
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Numerous tree limbs were blown down.  A tree limb broke a window.  Some trees were snapped near the top.

Thunderstorm Wind in WILL, ILLINOIS
From 20-JUN-21 22:50:00 to 20-JUN-21 22:50:00 (CST-6)
Location: CRETE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and power lines were blown down.

Tornado in DU PAGE, ILLINOIS
From 20-JUN-21 22:02:00 to 20-JUN-21 22:21:00 (CST-6)
Location: NAPERVILLE
Tornado F-scale: EF3
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado with peak winds of 140 mph touched down just south of 75th Street, west of Book Road in the western portion of the Springbrook Prairie Forest Preserve.  The near continuous damage path started near Plainfield-Naperville Road and Sheppey Court where considerable tree damage occurred.  Significant tree damage began just east of Modaff Road with trees snapped and others uprooted along Quall Drive.  Significant tree damage occurred near Verdin Lane with trees uprooted, trunks snapped and large tree limbs broken and tossed into homes.  Damage to homes in this area appeared to be primarily due to falling trees.  Tree damage continued through Killdeer Drive and along Bailey Road.  Damage to roofs occurred to some homes in this area.  Several utility poles were blown down on Bailey Road, between Lighthouse Drive and Coach Drive.  Windows were broken and debris was embedded in stucco on a southside wall of an apartment building on the southeast corner of Bailey Road and Coach Drive.  The tornado gradually intensified east of Naper Boulevard.  Large trees were snapped just east of Naper Boulevard along Bailey Road.  One fell onto a home causing roof damage.  Naperville Fire Station #2 was damaged.
The tornado jogged to the northeast and began to increase in width with tree damage continuing through Fender Road, where roof and wall damage occurred to a home from a falling tree.  Tree damage continued through Clemson Drive and Wehrli Road.  Widespread tree damage occurred near 77th Street where one car was flipped over and a second car was damaged by debris.  Roof and siding damage occurred to homes and a garage wall was removed.  A garage door was blown in and a wall was destroyed on Siebert Court.  The tornado destroyed a home on Princeton Circle.  The house completely collapsed with debris deposited to the northeast, though homes on either side remained standing with only minor damage.  It is at this location that the tornado reached peak intensity of EF3.  In the same block, considerable damage occurred to roofs of several nearby homes.  Damage to homes continued along Nutmeg Lane to Shady Grove Court, including the removal of walls on the second floor of at least one home and roofing damage to several others.  The tornado increased in width as it moved between 75th and 79th Streets, destroying garages and lifting roofing of an apartment complex along Gladstone Drive.  Considerable tree damage also occurred in the Green Valley Forest Preserve as the tornado crossed Greene Road.
The tornado continued east across Route 53 with tree and roof damage noted.  More significant damage began again near Woodridge Drive.  Several homes were damaged with large trees uprooted or snapped.  Multiple fences were also blown down.  Damage to homes continued near Evergreen Lane and James Court where several homes suffered significant roof and second story damage.  The tornado crossed Interstate 355 where a large portion of a traffic sign on southbound Interstate 355 was ripped off two steel posts.  The missing section of the traffic sign was found in a pond in the Lake Ridge Club, between 79th Street and 81st Street, east of Madison Street in Burr Ridge, nearly 6 miles from its original location.
Significant damage occurred to homes and apartment buildings east of Interstate 355 between Country Club Drive and Egerton Drive.  Some roofs were completely removed.  Tree and roof damage continued along Pine Drive and Britten Street.  The tornado began to increase in width again as it crossed Lemont Road where a warehouse building was damaged.  Tree and roof damage continued through Highland Avenue, Plainfield Road, Bailey Road and Cass Avenue.  At least one apartment building suffered significant roof damage along Lakeview Drive.  East of Cass Avenue, the tornado produced mainly tree damage, crossing Interstate 55, then Route 83 and then moving east along 83rd Street.  Damage occurred to several dozen homes in Burr Ridge.  The tornado crossed into Cook County near 83rd Street.
In Naperville, 231 structures reported some level of damage.  One home was completely destroyed, 19 were declared uninhabitable and 143 sustained major damage.  In Woodridge, 640 structures were damaged, including 31 homes that were uninhabitable and 157 that sustained major damage.  In Darrien, 2 homes were damaged and 1 was uninhabitable.  In Burr Ridge, 50 homes were damaged.  A total of 11 people were injured, including a woman who was 6 months pregnant and was critically injured.  She lost her unborn baby as the result of her injuries.