Multiple rounds of thunderstorms moved across northern Illinois on October 14th producing very heavy rainfall and some flooding.  Severe thunderstorms moved across northern Illinois during the late evening of October 14th.  A swath of 4 to 8 inches of rain fell from northern LaSalle, northern Kendall, northern Will, southern De Kalb, southern Kane and Du Page Counties.  River flooding was observed on portions of the Des Plaines and Du Page Rivers.
Chicago O'Hare Airport measured 4.19 inches of rain on October 14th, which was a new calendar day record for any day in October.  Storm total rainfall amounts included 9.30 inches one mile east southeast of Burr Ridge; 8.16 inches in Lisle; 8.09 inches two miles northeast of Somonauk; 7.98 inches two miles east southeast of Naperville; 7.72 inches in Aurora; 7.43 inches one mile south southeast of Montgomery; 7.25 inches in Westmont; 7.10 inches one mile south of Downers Grove; 6.85 inches three miles south of Earlville; 6.44 inches in Mendota; 5.41 inches three miles southwest of Midway Airport; 5.34 inches in Batavia and 5.05 inches in Plainfield.

Flood in COOK, ILLINOIS
From 14-OCT-17 18:55:00 to 14-OCT-17 22:00:00 (CST-6)
Location: HOFFMAN ESTATES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Water at least 3 inches deep covered multiple sections of roadway near Higgins and Golf Roads.

Flash Flood in LAKE, ILLINOIS
From 14-OCT-17 19:45:00 to 15-OCT-17 04:00:00 (CST-6)
Location: FOREST LAKE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

At least 10 people were rescued from submerged vehicles on Route 41 near Deerpath Road and on Washington Circle.  No injuries were reported.  A few homes in the area were also reported flooded.  Storm total rainfall of 4.54 inches was measured two miles north northeast of Lake Forest and 4.28 inches was measured one mile north of Lincolnshire.

Thunderstorm Wind in LIVINGSTON, ILLINOIS
From 14-OCT-17 19:40:00 to 14-OCT-17 19:40:00 (CST-6)
Location: FAIRBURY
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple large tree limbs and power lines were blown down.

Thunderstorm Wind in KENDALL, ILLINOIS
From 14-OCT-17 18:30:00 to 14-OCT-17 18:31:00 (CST-6)
Location: NEWARK
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down and utility poles were snapped along Chicago Road from near Coy Park Road to near Meadow Lane.

Flood in LAKE, ILLINOIS
From 14-OCT-17 19:45:00 to 14-OCT-17 23:00:00 (CST-6)
Location: QUENTINS CORNERS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

One foot of standing water was reported on Lake Cook Road at Deer Park Boulevard.

Flood in WILL, ILLINOIS
From 14-OCT-17 20:15:00 to 14-OCT-17 23:00:00 (CST-6)
Location: STEGER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Five inches of water was reported covering the roadway near Edwards Drive and Ronald Road.

Flood in KANE, ILLINOIS
From 14-OCT-17 18:40:00 to 14-OCT-17 23:00:00 (CST-6)
Location: ST CHARLES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple roadways were reported flooded.

Flood in DE KALB, ILLINOIS
From 14-OCT-17 21:30:00 to 15-OCT-17 02:00:00 (CST-6)
Location: SOMONAUK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two feet of water was reported on Route 34.

Flash Flood in DU PAGE, ILLINOIS
From 14-OCT-17 21:30:00 to 15-OCT-17 02:00:00 (CST-6)
Location: FRONTEAC
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous roads throughout Naperville were flooded.

Flood in DU PAGE, ILLINOIS
From 14-OCT-17 22:00:00 to 15-OCT-17 02:00:00 (CST-6)
Location: FLOWERFIELD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A portion of northbound Finley Road had at least two feet of flood water.

Flash Flood in COOK, ILLINOIS
From 14-OCT-17 21:15:00 to 15-OCT-17 04:00:00 (CST-6)
Location: (CGX)MEIGS FLD CHICA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The Chicago River overflowed its downtown banks to submerge most of the popular Chicago Riverwalk.  Several entryways from Franklin Street east to Lake Michigan were taped off by police.

Flood in COOK, ILLINOIS
From 14-OCT-17 21:00:00 to 15-OCT-17 05:00:00 (CST-6)
Location: DES PLAINES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous streets and viaducts were flooded in the City of Chicago.

Thunderstorm Wind in LA SALLE, ILLINOIS
From 14-OCT-17 18:45:00 to 14-OCT-17 18:45:00 (CST-6)
Location: STREATOR
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Utility lines were blown down.