Strong to severe thunderstorms moved across portions of northern Illinois during the afternoon of September 3rd.

Lightning in WILL, ILLINOIS
From 03-SEP-18 12:37:00 to 03-SEP-18 12:37:00 (CST-6)
Location: BARBERS CORNERS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A man was struck by lightning in Whalon Lake Forest Preserve and died a few days later.

Funnel Cloud in MCHENRY, ILLINOIS
From 03-SEP-18 12:42:00 to 03-SEP-18 12:42:00 (CST-6)
Location: MC HENRY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A funnel cloud was observed in Mc Henry but did not reach the ground.

Thunderstorm Wind in DU PAGE, ILLINOIS
From 03-SEP-18 12:56:00 to 03-SEP-18 12:56:00 (CST-6)
Location: WESTMONT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated to 60 mph.

Lightning in COOK, ILLINOIS
From 03-SEP-18 13:00:00 to 03-SEP-18 13:00:00 (CST-6)
Location: BROOKFIELD
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Lightning struck a parapet brick wall on a two story apartment building producing only minor damage.

Thunderstorm Wind in DU PAGE, ILLINOIS
From 03-SEP-18 14:15:00 to 03-SEP-18 14:16:00 (CST-6)
Location: WAYNE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several large trees and tree limbs were blown down along with one utility pole.  The damage was near and west of Powis Road and near and north of Army Trail Road.

Funnel Cloud in WINNEBAGO, ILLINOIS
From 03-SEP-18 14:58:00 to 03-SEP-18 14:58:00 (CST-6)
Location: HARLEM
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two spotters observed a funnel cloud in Rock Cut State Park, north of Harlem Road.  After discussion with employees at the park, it was determined that this funnel cloud did not touch the ground.

Thunderstorm Wind in COOK, ILLINOIS
From 03-SEP-18 13:28:00 to 03-SEP-18 13:28:00 (CST-6)
Location: AVONDALE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One large tree and one large tree limb were blown down near Clark and Montrose.

Tornado in COOK, ILLINOIS
From 03-SEP-18 13:14:00 to 03-SEP-18 13:18:00 (CST-6)
Location: BERWYN
Tornado F-scale: EF0
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A weak EF-0 tornado produced mainly tree damage in western Chicago.  The first damage was noted on Arthington Street, just west of Cicero Avenue.  A continuous path of mostly minor tree damage extended to the east northeast crossing Interstate 290 near Pulaski Road with the final damage noted near Garfield Park, between 5th Avenue and Jackson Blvd near Central Park Avenue.  One tree was blown into an apartment building knocking out windows and a couple of large tree limbs fell onto cars.

Funnel Cloud in OGLE, ILLINOIS
From 03-SEP-18 13:25:00 to 03-SEP-18 13:25:00 (CST-6)
Location: ADELINE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter recorded video of a funnel cloud extending three quarters of the way to the ground.

Thunderstorm Wind in COOK, ILLINOIS
From 03-SEP-18 13:28:00 to 03-SEP-18 13:28:00 (CST-6)
Location: AVONDALE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Two large tree limbs were blown down in the Uptown neighborhood.

Funnel Cloud in OGLE, ILLINOIS
From 03-SEP-18 13:49:00 to 03-SEP-18 13:49:00 (CST-6)
Location: LEAF RIVER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A brief funnel cloud was observed extending at least halfway to the ground.

Lightning in COOK, ILLINOIS
From 03-SEP-18 13:25:00 to 03-SEP-18 13:25:00 (CST-6)
Location: DUNNING
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

A house was struck by lightning and was damaged in the southern part of the Portage Park neighborhood.

Flood in WINNEBAGO, ILLINOIS
From 03-SEP-18 14:30:00 to 03-SEP-18 16:30:00 (CST-6)
Location: ROSCOE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A park was reported flooded in Roscoe.

Flood in MCHENRY, ILLINOIS
From 03-SEP-18 12:10:00 to 03-SEP-18 14:30:00 (CST-6)
Location: WOODSTOCK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Water from retention ponds overflowed onto some streets with about 3 inches of standing flood waters.

Flood in COOK, ILLINOIS
From 03-SEP-18 15:50:00 to 03-SEP-18 17:30:00 (CST-6)
Location: BLUE IS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

About six inches of water was reported in the left lane of Interstate 57 near mile marker 351.

Heavy Rain in COOK, ILLINOIS
From 03-SEP-18 12:56:00 to 03-SEP-18 13:26:00 (CST-6)
Location: EVANSTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Rainfall of 1.25 inches was measured in 30 minutes.

Flood in COOK, ILLINOIS
From 03-SEP-18 15:47:00 to 03-SEP-18 17:30:00 (CST-6)
Location: (CGX)MEIGS FLD CHICA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Southbound Interstate 90 was reported flooded near the Jane Byrne Interchange.

Flash Flood in COOK, ILLINOIS
From 03-SEP-18 13:12:00 to 03-SEP-18 15:15:00 (CST-6)
Location: (ORD)O'HARE INTL ARP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Heavy rain caused flooding inside portions of Terminal 5 at Chicago O'Hare Airport.  Interstate 90, which is the entrance to O'Hare Airport, was closed in both directions due to significant flooding where Mannheim Road crosses the interstate and where the Canadian National Railway bridge crosses the interstate.  Rainfall of 1.45 inches was measured at O'Hare Airport and 1.97 inches was measured nearby, 0.7 miles west northwest of Park Ridge.