A slow-moving cold front interacting with an unseasonably warm and humid airmass triggered several rounds of thunderstorms across west-central Illinois during the afternoon and evening of October 14th.  The strongest and most persistent storms impacted Knox County, producing scattered wind damage and dropping locally heavy rainfall of 2 to 3 inches.  Numerous streets in the city of Galesburg were flooded, with some cars stalling in the high water.  The storms weakened as they shifted eastward, with a few cells producing additional wind damage south of Ashland in Morgan County and northwest of Lincoln in Logan County.

Hail in KNOX, ILLINOIS
From 14-OCT-17 17:09:00 to 14-OCT-17 17:16:00 (CST-6)
Location: GALESBURG
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in PEORIA, ILLINOIS
From 14-OCT-17 18:12:00 to 14-OCT-17 18:17:00 (CST-6)
Location: NORTH CHILLICOTHE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 12-inch diameter tree branch was blown down.

Thunderstorm Wind in WOODFORD, ILLINOIS
From 14-OCT-17 18:20:00 to 14-OCT-17 18:25:00 (CST-6)
Location: SPRING BAY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A power line was blown down, closing Highway 26 near Spring Bay.

Flash Flood in KNOX, ILLINOIS
From 14-OCT-17 17:50:00 to 14-OCT-17 19:50:00 (CST-6)
Location: (GBG)GALESBURG ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms producing excessive rainfall rates dropped 2 to 3 inches of rain across the city of Galesburg in a short period of time.  As a result, several streets were impassable due to as much as 2 feet of water flowing across them.  A few cars stalled in the high water.

Thunderstorm Wind in KNOX, ILLINOIS
From 14-OCT-17 17:00:00 to 14-OCT-17 17:05:00 (CST-6)
Location: ABINGDON
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Mesonet

Several large tree branches were blown down about a mile north of Abingdon.

Thunderstorm Wind in KNOX, ILLINOIS
From 14-OCT-17 17:09:00 to 14-OCT-17 17:14:00 (CST-6)
Location: GALESBURG
Magnitude: 61.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees and large tree branches were blown down across Galesburg.

Thunderstorm Wind in PEORIA, ILLINOIS
From 14-OCT-17 17:58:00 to 14-OCT-17 18:03:00 (CST-6)
Location: ELMWOOD
Magnitude: 61.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several 8 to 12-inch diameter tree branches were snapped.

Thunderstorm Wind in WOODFORD, ILLINOIS
From 14-OCT-17 18:20:00 to 14-OCT-17 18:25:00 (CST-6)
Location: SPRING BAY
Magnitude: 61.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Public

Numerous trees were blown on Highway 26 about 5 miles southeast of Chillicothe.

Thunderstorm Wind in LOGAN, ILLINOIS
From 14-OCT-17 22:15:00 to 14-OCT-17 22:20:00 (CST-6)
Location: LINCOLN
Magnitude: 61.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: NWS Employee

Six power poles were blown down on Old Route 121 northwest of Lincoln.

Thunderstorm Wind in MORGAN, ILLINOIS
From 14-OCT-17 22:40:00 to 14-OCT-17 22:45:00 (CST-6)
Location: PRENTICE
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Several trees as large as 3 to 4 feet in diameter were blown down along Hog Barn Road about 2 miles east of Prentice and 2 miles south of Ashland.  Numerous branches were downed and a few tree tops were snapped as well.