Severe thunderstorms moved across portions of northern Illinois on September 7th, producing very large hail and localized significant wind damage.

Thunderstorm Wind in COOK, ILLINOIS
From 07-SEP-21 12:52:00 to 07-SEP-21 12:52:00 (CST-6)
Location: (PWK) CHICAGO EXECUTIVE AIRPORT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in COOK, ILLINOIS
From 07-SEP-21 12:55:00 to 07-SEP-21 12:55:00 (CST-6)
Location: NORTHBROOK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple 3 to 4 inch diameter tree limbs were blown down.

Thunderstorm Wind in WINNEBAGO, ILLINOIS
From 07-SEP-21 11:32:00 to 07-SEP-21 11:32:00 (CST-6)
Location: SHIRLAND
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A photo shared on social media showed a tree blown down.

Hail in BOONE, ILLINOIS
From 07-SEP-21 11:54:00 to 07-SEP-21 11:56:00 (CST-6)
Location: CANDLEWICK LAKE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 07-SEP-21 11:58:00 to 07-SEP-21 12:00:00 (CST-6)
Location: HARVARD
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MCHENRY, ILLINOIS
From 07-SEP-21 12:13:00 to 07-SEP-21 12:13:00 (CST-6)
Location: WONDER LAKE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A small tree about six inches in diameter was snapped.

Hail in MCHENRY, ILLINOIS
From 07-SEP-21 12:16:00 to 07-SEP-21 12:17:00 (CST-6)
Location: RICHMOND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 07-SEP-21 12:20:00 to 07-SEP-21 12:21:00 (CST-6)
Location: SPRING GROVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCHENRY, ILLINOIS
From 07-SEP-21 12:23:00 to 07-SEP-21 12:24:00 (CST-6)
Location: JOHNSBURG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCHENRY, ILLINOIS
From 07-SEP-21 12:26:00 to 07-SEP-21 12:28:00 (CST-6)
Location: WOODSTOCK
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LAKE, ILLINOIS
From 07-SEP-21 12:29:00 to 07-SEP-21 12:31:00 (CST-6)
Location: ROUND LAKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MCHENRY, ILLINOIS
From 07-SEP-21 12:29:00 to 07-SEP-21 12:29:00 (CST-6)
Location: BULL VALLEY
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wind gust to 68 mph was measured on a personal weather station.

Thunderstorm Wind in MCHENRY, ILLINOIS
From 07-SEP-21 12:30:00 to 07-SEP-21 12:30:00 (CST-6)
Location: OAKWOOD HILLS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous tree limbs were snapped and blown down.  A large tree limb was blocking westbound Route 176.

Thunderstorm Wind in MCHENRY, ILLINOIS
From 07-SEP-21 12:36:00 to 07-SEP-21 12:36:00 (CST-6)
Location: PORT BARRINGTON
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Multiple trees and large tree limbs were blown down along Roberts Road.

Thunderstorm Wind in LAKE, ILLINOIS
From 07-SEP-21 12:39:00 to 07-SEP-21 12:39:00 (CST-6)
Location: WILLIAMS PARK
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A photo shared on social media showed a large tree blown down blocking Darrel Road, south of Route 176.

Hail in LAKE, ILLINOIS
From 07-SEP-21 12:40:00 to 07-SEP-21 12:40:00 (CST-6)
Location: GAGES LAKE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LAKE, ILLINOIS
From 07-SEP-21 12:42:00 to 07-SEP-21 12:42:00 (CST-6)
Location: LIBERTYVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tree limbs were blown down.

Thunderstorm Wind in LAKE, ILLINOIS
From 07-SEP-21 12:45:00 to 07-SEP-21 12:45:00 (CST-6)
Location: VERNON HILLS
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A 14 inch diameter tree was snapped at its base.

Thunderstorm Wind in LAKE, ILLINOIS
From 07-SEP-21 12:55:00 to 07-SEP-21 12:55:00 (CST-6)
Location: DEERFIELD
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Video shared on social media showed the top of a large tree getting snapped off.

Thunderstorm Wind in LAKE, ILLINOIS
From 07-SEP-21 12:59:00 to 07-SEP-21 12:59:00 (CST-6)
Location: HIGHLAND PARK
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A photo was shared on social media of a tree blown down near Highland Park.

Thunderstorm Wind in LAKE, ILLINOIS
From 07-SEP-21 13:05:00 to 07-SEP-21 13:05:00 (CST-6)
Location: HIGHWOOD
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 20 inch diameter tree was blown down onto a road.

Hail in LEE, ILLINOIS
From 07-SEP-21 12:13:00 to 07-SEP-21 12:14:00 (CST-6)
Location: NELSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LEE, ILLINOIS
From 07-SEP-21 12:19:00 to 07-SEP-21 12:21:00 (CST-6)
Location: DIXON
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LEE, ILLINOIS
From 07-SEP-21 12:34:00 to 07-SEP-21 12:36:00 (CST-6)
Location: AMBOY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LEE, ILLINOIS
From 07-SEP-21 12:57:00 to 07-SEP-21 12:58:00 (CST-6)
Location: PAW PAW
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in LEE, ILLINOIS
From 07-SEP-21 12:58:00 to 07-SEP-21 13:02:00 (CST-6)
Location: COMPTON
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail two inches in diameter smashed at least six auto windshields and smashed multiple skylights at one residence.

Hail in LEE, ILLINOIS
From 07-SEP-21 12:57:00 to 07-SEP-21 12:59:00 (CST-6)
Location: WEST BROOKLYN
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A photo shared on social media showed hail two inches in diameter.  Small dents on vehicles were reported.

Hail in LEE, ILLINOIS
From 07-SEP-21 13:02:00 to 07-SEP-21 13:04:00 (CST-6)
Location: COMPTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Golf ball size hail damaged siding at a farmstead.

Hail in LEE, ILLINOIS
From 07-SEP-21 13:11:00 to 07-SEP-21 13:13:00 (CST-6)
Location: PAW PAW
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LA SALLE, ILLINOIS
From 07-SEP-21 13:18:00 to 07-SEP-21 13:20:00 (CST-6)
Location: EARLVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in LA SALLE, ILLINOIS
From 07-SEP-21 13:25:00 to 07-SEP-21 13:27:00 (CST-6)
Location: EARLVILLE
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Multiple reports of two inch diameter hail in and near Earlville were received.  Hail covered the ground in many areas and took several hours to melt with fog forming over the hail after the storm ended.

Thunderstorm Wind in LA SALLE, ILLINOIS
From 07-SEP-21 13:47:00 to 07-SEP-21 13:47:00 (CST-6)
Location: BAKER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A three inch diameter tree limb was blown down.

Thunderstorm Wind in GRUNDY, ILLINOIS
From 07-SEP-21 13:53:00 to 07-SEP-21 13:55:00 (CST-6)
Location: STOCKDALE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees were blown down along Route 6 between Seneca and Morris.  One tree was snapped in half.  A utility pole was also damaged.

Thunderstorm Wind in GRUNDY, ILLINOIS
From 07-SEP-21 13:55:00 to 07-SEP-21 13:55:00 (CST-6)
Location: (C09) MORRIS MUNICIPAL AIRPORT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in KENDALL, ILLINOIS
From 07-SEP-21 13:55:00 to 07-SEP-21 13:55:00 (CST-6)
Location: LISBON
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a measured gust to 72 mph.

Thunderstorm Wind in KENDALL, ILLINOIS
From 07-SEP-21 13:59:00 to 07-SEP-21 13:59:00 (CST-6)
Location: PLATTVILLE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree limbs were blown down.  Winds were estimated between 60 and 65 mph.

Thunderstorm Wind in GRUNDY, ILLINOIS
From 07-SEP-21 13:55:00 to 07-SEP-21 13:57:00 (CST-6)
Location: MORRIS
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees and power lines were blown down in and around Morris including a 16 inch diameter tree that was snapped.

Thunderstorm Wind in KENDALL, ILLINOIS
From 07-SEP-21 13:47:00 to 07-SEP-21 13:48:00 (CST-6)
Location: LISBON
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Numerous tree limbs up to four inches in diameter were blown down.  Corn crops were blown down south of Lisbon.

Thunderstorm Wind in KENDALL, ILLINOIS
From 07-SEP-21 13:58:00 to 07-SEP-21 13:58:00 (CST-6)
Location: MINOOKA
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A few shingles were blown off the west side roof of a residence along Holt Road.  Corn crops were blown down nearby.

Thunderstorm Wind in GRUNDY, ILLINOIS
From 07-SEP-21 14:02:00 to 07-SEP-21 14:04:00 (CST-6)
Location: MINOOKA
Magnitude: 74.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Widespread tree damage occurred across much of Minooka.  Some of the trees fell onto structures and houses causing roof damage.  Tractor trailers were overturned at a cold storage facility.  The damage was consistent with wind gusts to around 85 mph.

Thunderstorm Wind in GRUNDY, ILLINOIS
From 07-SEP-21 14:03:00 to 07-SEP-21 14:03:00 (CST-6)
Location: MINOOKA
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Approximately one quarter mile of wooden fence was blown down.  Part of a metal fence was blown down just north of this area.

Thunderstorm Wind in WILL, ILLINOIS
From 07-SEP-21 14:08:00 to 07-SEP-21 14:10:00 (CST-6)
Location: CHANNAHON
Magnitude: 74.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Widespread tree damage occurred across much of Channahon.  Some trees were uprooted.  A dozen or more trees fell onto structures and houses causing roof damage.  Siding damage was reported to two houses.  The worst damage appeared to be near the DuPage River, southwest of the junior high school.  The damage was consistent with wind gusts to around 85 mph.

Thunderstorm Wind in WILL, ILLINOIS
From 07-SEP-21 14:10:00 to 07-SEP-21 14:10:00 (CST-6)
Location: MILLSDALE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A semi truck was overturned on Interstate 55 at Arsenal Road.

Thunderstorm Wind in WILL, ILLINOIS
From 07-SEP-21 14:09:00 to 07-SEP-21 14:09:00 (CST-6)
Location: MILLSDALE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was blown down on southbound Interstate 55 at Route 6.

Thunderstorm Wind in WILL, ILLINOIS
From 07-SEP-21 14:24:00 to 07-SEP-21 14:24:00 (CST-6)
Location: MANHATTAN
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A photo was shared on social media of utility poles snapped at their base.

Hail in LAKE, ILLINOIS
From 07-SEP-21 12:50:00 to 07-SEP-21 12:51:00 (CST-6)
Location: FOREST LAKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported near Quentin and Lake Zurich Roads.

Thunderstorm Wind in KANKAKEE, ILLINOIS
From 07-SEP-21 14:42:00 to 07-SEP-21 14:42:00 (CST-6)
Location: SOLLITT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated to 60 mph.

Thunderstorm Wind in KANKAKEE, ILLINOIS
From 07-SEP-21 14:45:00 to 07-SEP-21 14:45:00 (CST-6)
Location: WEST KANKAKEE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree limb 6 to 12 inches in diameter was blown down.

Thunderstorm Wind in WILL, ILLINOIS
From 07-SEP-21 14:38:00 to 07-SEP-21 14:38:00 (CST-6)
Location: PEOTONE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree limbs 8 inches in diameter were blown down.

Thunderstorm Wind in WILL, ILLINOIS
From 07-SEP-21 14:40:00 to 07-SEP-21 14:40:00 (CST-6)
Location: PEOTONE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Ten to twelve utility poles were blown down.

Thunderstorm Wind in WILL, ILLINOIS
From 07-SEP-21 14:17:00 to 07-SEP-21 14:17:00 (CST-6)
Location: ELWOOD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Wind gusts were estimated between 50 and 60 mph.  Tree limbs 2 inches in diameter were blown down.

Thunderstorm Wind in WILL, ILLINOIS
From 07-SEP-21 14:18:00 to 07-SEP-21 14:18:00 (CST-6)
Location: ELWOOD
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Damage was reported to buildings at a farm on the corner of Hoff and Rowell Roads.  Some trees were uprooted and corn was flattened.

Thunderstorm Wind in LIVINGSTON, ILLINOIS
From 07-SEP-21 15:18:00 to 07-SEP-21 15:18:00 (CST-6)
Location: FLANAGAN
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A large metal outbuilding collapsed.

Thunderstorm Wind in LIVINGSTON, ILLINOIS
From 07-SEP-21 15:20:00 to 07-SEP-21 15:20:00 (CST-6)
Location: FLANAGAN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Large tree limbs were blown down.

Thunderstorm Wind in FORD, ILLINOIS
From 07-SEP-21 16:35:00 to 07-SEP-21 16:37:00 (CST-6)
Location: GIBSON CITY
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Widespread tree and powerline damage was reported in Gibson City.  The roof of the hospital was damaged and a baseball dugout was destroyed.

Hail in KANKAKEE, ILLINOIS
From 07-SEP-21 17:01:00 to 07-SEP-21 17:02:00 (CST-6)
Location: ESSEX
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in GRUNDY, ILLINOIS
From 07-SEP-21 14:58:00 to 07-SEP-21 14:59:00 (CST-6)
Location: GARDNER
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and powerlines were blown down.