A strong cold front moved across northern Illinois during the late morning and afternoon of October 20th.  This cold front produced snow squalls that reduced visibility to near zero for short periods.  Winds gusted as high as 65 mph.  Numerous trees and tree limbs were blown down.  At the height of the high winds, an estimated 80,000 customers lost power.  Peak wind gusts included 65 mph in Somonauk; 63 mph three miles southwest of Chicago Midway Airport; 61 mph at Chicago O'Hare (ORD) and Rockford Airports (RFD); 60 mph at Chicago Midway (MDW) and Lewis Airport in Romeoville (LOT); 59 mph three miles north of Popular Grove and 58 mph at Dupage/West Chicago Airport (DPA).
Damage included numerous power lines blown down.  An uprooted tree and its root system caused extensive damage to a garage in Crest Hill.  A large tree limb fell onto a garage in Lockport.  A house was damaged in Steger after a tree fell on it.  A semi truck was blown over on Interstate 57 near mile marker 292.

High Wind in WINNEBAGO, ILLINOIS
From 20-OCT-18 11:46:00 to 20-OCT-18 11:46:00 (CST-6)
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Measured wind gust to 61 mph at Rockford Airport (RFD).

High Wind in COOK, ILLINOIS
From 20-OCT-18 12:37:00 to 20-OCT-18 12:37:00 (CST-6)
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Measured wind gust to 61 mph at Chicago O'Hare Airport (ORD).

High Wind in WILL, ILLINOIS
From 20-OCT-18 12:55:00 to 20-OCT-18 12:55:00 (CST-6)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Measured wind gust to 60 mph at Lewis Airport (LOT).

High Wind in COOK, ILLINOIS
From 20-OCT-18 12:56:00 to 20-OCT-18 12:56:00 (CST-6)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Measured wind gust to 60 mph at Chicago Midway Airport (MDW).

High Wind in DE KALB, ILLINOIS
From 20-OCT-18 14:04:00 to 20-OCT-18 14:04:00 (CST-6)
Magnitude: 56.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Measured wind gust to 65 mph on home weather station in Somonauk.  A fence was blown down.

High Wind in DU PAGE, ILLINOIS
From 20-OCT-18 12:28:00 to 20-OCT-18 12:28:00 (CST-6)
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Measured wind gust to 58 mph at DuPage Airport (DPA).

High Wind in BOONE, ILLINOIS
From 20-OCT-18 13:00:00 to 20-OCT-18 13:00:00 (CST-6)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured wind gust to 59 mph three miles north of Popular Grove.

High Wind in COOK, ILLINOIS
From 20-OCT-18 12:55:00 to 20-OCT-18 12:55:00 (CST-6)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Measured wind gust to 63 mph three miles southwest of Chicago Midway Airport, in Burbank.

High Wind in WILL, ILLINOIS
From 20-OCT-18 12:52:00 to 20-OCT-18 13:00:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large tree was uprooted on Route 53 in Crest Hill.  The root system lifted up underneath a garage lifting the garage off its foundation and causing extensive damage to the building.  A large tree limb fell onto a garage in Lockport.  Several large maple tree limbs were blown down east of Ingalls Park.

High Wind in IROQUOIS, ILLINOIS
From 20-OCT-18 13:55:00 to 20-OCT-18 13:55:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A large tree limb was broken off a tree in Beaverville.

High Wind in WILL, ILLINOIS
From 20-OCT-18 13:20:00 to 20-OCT-18 13:20:00 (CST-6)
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Multiple large trees were blown down or were snapped, some across roads.  One tree damaged a house.

High Wind in WILL, ILLINOIS
From 20-OCT-18 14:20:00 to 20-OCT-18 14:20:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Two small trees were blown down in far southwest Plainfield.

High Wind in DE KALB, ILLINOIS
From 20-OCT-18 13:10:00 to 20-OCT-18 13:10:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A medium sized tree 8 to 12 inches in diameter was uprooted.

High Wind in DU PAGE, ILLINOIS
From 20-OCT-18 12:40:00 to 20-OCT-18 12:40:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large tree 12 to 18 inches in diameter and large tree limbs 8 to 10 inches in diameter were blown down in Lisle.

High Wind in KANE, ILLINOIS
From 20-OCT-18 12:38:00 to 20-OCT-18 12:38:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A power line was blown down near Indian Trail and Randall Roads northwest of Aurora.

High Wind in COOK, ILLINOIS
From 20-OCT-18 12:40:00 to 20-OCT-18 12:40:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A large tree approximately 12 to 18 inches in diameter was uprooted in Westchester.

High Wind in DU PAGE, ILLINOIS
From 20-OCT-18 12:37:00 to 20-OCT-18 12:37:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Medium to large sized tree limbs were blown down in the Naper Carriage Hill subdivision of Naperville.

High Wind in DE KALB, ILLINOIS
From 20-OCT-18 12:20:00 to 20-OCT-18 12:20:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Large trees were blown down blocking some streets.  Power lines were also blown down.

High Wind in MCHENRY, ILLINOIS
From 20-OCT-18 12:05:00 to 20-OCT-18 12:05:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Scattered medium to large tree limbs were blown down near Crystal Lake High School.

High Wind in OGLE, ILLINOIS
From 20-OCT-18 12:05:00 to 20-OCT-18 12:05:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large tree was uprooted and fell across Ridge Road near Henry Road, southwest of Oregon.

High Wind in MCHENRY, ILLINOIS
From 20-OCT-18 10:15:00 to 20-OCT-18 10:15:00 (CST-6)
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 near Crystal Lake High School.  Another tree limb was blown down onto a power line.

High Wind in IROQUOIS, ILLINOIS
From 20-OCT-18 15:15:00 to 20-OCT-18 15:15:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Siding was blown off the west side of a house in Sheldon.

High Wind in IROQUOIS, ILLINOIS
From 20-OCT-18 15:30:00 to 20-OCT-18 15:30:00 (CST-6)
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A semi truck was blown off Interstate 57 near mile marker 292 in Ashkum.