An isolated supercell thunderstorm developed over north central Illinois and moved across portions of the Chicago metropolitan area during the afternoon of August 2nd, producing  large hail and severe winds.  A 35 year old man was killed at an outdoor event in Wood Dale when a large tent collapsed causing a beam to strike the man.  Another 20 people were injured, including three seriously injured.  One of the seriously injured, an 81 year old woman died from her injuries in January 2016.  Additional thunderstorms formed later in the evening producing severe weather, including a tornado near Grayslake.

Hail in KANE, ILLINOIS
From 02-AUG-15 13:16:00 to 02-AUG-15 13:16:00 (CST-6)
Location: ST CHARLES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COOK, ILLINOIS
From 02-AUG-15 21:30:00 to 02-AUG-15 21:32:00 (CST-6)
Location: BARRINGTON WOODS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail 1.5 to 2.0 inches in diameter was reported across Palatine.

Hail in DE KALB, ILLINOIS
From 02-AUG-15 12:40:00 to 02-AUG-15 12:54:00 (CST-6)
Location: DEKALB
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were multiple reports of quarter to golf ball size hail in and around De Kalb.  Golf ball size hail fell at 1st Street and Taylor.  Half dollar size hail fell near Annie Glidden Road.

Hail in KANE, ILLINOIS
From 02-AUG-15 13:01:00 to 02-AUG-15 13:01:00 (CST-6)
Location: MAPLE PARK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DU PAGE, ILLINOIS
From 02-AUG-15 13:20:00 to 02-AUG-15 13:20:00 (CST-6)
Location: MUNGER
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in COOK, ILLINOIS
From 02-AUG-15 13:56:00 to 02-AUG-15 13:56:00 (CST-6)
Location: EVANSTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 02-AUG-15 20:29:00 to 02-AUG-15 20:34:00 (CST-6)
Location: GALT AIRPORT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Nickel to quarter size hail was reported near Wonder Lake.

Thunderstorm Wind in MCHENRY, ILLINOIS
From 02-AUG-15 20:50:00 to 02-AUG-15 20:50:00 (CST-6)
Location: MCHENRY
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 02-AUG-15 21:15:00 to 02-AUG-15 21:15:00 (CST-6)
Location: ALGONQUIN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 02-AUG-15 20:59:00 to 02-AUG-15 20:59:00 (CST-6)
Location: MCCULLOM LAKE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm Wind in LAKE, ILLINOIS
From 02-AUG-15 21:00:00 to 02-AUG-15 21:00:00 (CST-6)
Location: GAGES LAKE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees were uprooted along Highway 120 between Hunt Club Road and I-94.

Hail in COOK, ILLINOIS
From 02-AUG-15 13:40:00 to 02-AUG-15 13:40:00 (CST-6)
Location: ROSEMONT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COOK, ILLINOIS
From 02-AUG-15 13:53:00 to 02-AUG-15 13:53:00 (CST-6)
Location: EVANSTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DE KALB, ILLINOIS
From 02-AUG-15 21:20:00 to 02-AUG-15 21:20:00 (CST-6)
Location: HART
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COOK, ILLINOIS
From 02-AUG-15 21:25:00 to 02-AUG-15 21:25:00 (CST-6)
Location: BARRINGTON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail in KANE, ILLINOIS
From 02-AUG-15 21:55:00 to 02-AUG-15 21:55:00 (CST-6)
Location: PLATO CORNERS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DU PAGE, ILLINOIS
From 02-AUG-15 13:17:00 to 02-AUG-15 13:17:00 (CST-6)
Location: WAYNE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DU PAGE, ILLINOIS
From 02-AUG-15 13:23:00 to 02-AUG-15 13:25:00 (CST-6)
Location: CAROL STREAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COOK, ILLINOIS
From 02-AUG-15 21:36:00 to 02-AUG-15 21:36:00 (CST-6)
Location: ARLINGTON PARK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm Wind in WILL, ILLINOIS
From 02-AUG-15 22:25:00 to 02-AUG-15 22:25:00 (CST-6)
Location: CRETE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and power lines were blown down in Crete.

Hail in DU PAGE, ILLINOIS
From 02-AUG-15 13:25:00 to 02-AUG-15 13:29:00 (CST-6)
Location: ROSELLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter to golf ball size hail was reported in Roselle.

Thunderstorm Wind in DU PAGE, ILLINOIS
From 02-AUG-15 13:35:00 to 02-AUG-15 13:35:00 (CST-6)
Location: WOOD DALE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

A tent collapsed during a thunderstorm at the Wood Dale Prairie Fest killing a 35 year old man and injuring 20 other people, three seriously.  One of the three seriously injured, an 81 year old woman, died from her injuries in January 2016.

Thunderstorm Wind in COOK, ILLINOIS
From 02-AUG-15 13:42:00 to 02-AUG-15 13:42:00 (CST-6)
Location: ROSEMONT
Magnitude: 60.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong winds ripped a hole in the Dome at the Ballpark practice facility causing it to collapse.

Hail in COOK, ILLINOIS
From 02-AUG-15 13:45:00 to 02-AUG-15 13:45:00 (CST-6)
Location: LINCOLNWOOD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Thunderstorm Wind in COOK, ILLINOIS
From 02-AUG-15 22:00:00 to 02-AUG-15 22:00:00 (CST-6)
Location: GRAYLAND
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An eight inch diameter tree branch was snapped in Belmont.

Tornado in LAKE, ILLINOIS
From 02-AUG-15 19:38:00 to 02-AUG-15 19:53:00 (CST-6)
Location: ROUND LAKE
Tornado F-scale: EF1
Property damage: 1.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado touched down near Cedar Lake Road in Round Lake where tree damage occurred.  The tornado moved east and damaged hundreds of trees along the 7.5 mile long path, including dozens that were snapped at the base or uprooted.  The most significant tree damage was noted in the subdivisions of Grayslake and Wildwood.  A roof was blown off of a restaurant along Illinois Route 134 with a sign from the restaurant ending up over two miles away in Grayslake.  Several homes and businesses suffered roof damage from either falling trees or loss of shingles.  A large part of the roof of the Grayslake Central High School was blown across the street.  A nearby skatepark was heavily damaged.  The last points of damage were noted along Illinois Route 120 just west of I-94 in unincorporated Wildwood.

Hail in COOK, ILLINOIS
From 02-AUG-15 22:43:00 to 02-AUG-15 22:43:00 (CST-6)
Location: PALOS HILLS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in DU PAGE, ILLINOIS
From 02-AUG-15 13:28:00 to 02-AUG-15 13:28:00 (CST-6)
Location: BLOOMINGDALE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in KANE, ILLINOIS
From 02-AUG-15 13:05:00 to 02-AUG-15 13:05:00 (CST-6)
Location: ELBURN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in COOK, ILLINOIS
From 02-AUG-15 13:50:00 to 02-AUG-15 13:50:00 (CST-6)
Location: AVONDALE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Thunderstorm Wind in COOK, ILLINOIS
From 02-AUG-15 13:55:00 to 02-AUG-15 13:55:00 (CST-6)
Location: EVANSTON
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 2.5 foot diameter tree about 30 feet tall was uprooted near Kedzie Street and Sheridan Road.  Numerous large trees were blown down in the Rogers Park area.  One man was injured by a falling tree near Touhy Avenue.

Hail in MCHENRY, ILLINOIS
From 02-AUG-15 20:27:00 to 02-AUG-15 20:27:00 (CST-6)
Location: RICHMOND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail in MCHENRY, ILLINOIS
From 02-AUG-15 21:06:00 to 02-AUG-15 21:10:00 (CST-6)
Location: CRYSTAL LAKE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media