A cold front dropping slowly southward from the Upper Midwest interacted with a hot and humid airmass to trigger thunderstorms across north-central Illinois during the late afternoon and evening of June 10th.  Damaging wind gusts of 60 to 70 mph and hail as large as golf balls were reported primarily along and north of a Canton to Minonk line.  Rainfall amounts of 3.00 to 6.00 inches on already saturated ground resulted in flash flooding along the Illinois River valley, which persisted into the early morning hours of June 11th.

Hail in MARSHALL, ILLINOIS
From 10-JUN-15 17:30:00 to 10-JUN-15 17:35:00 (CST-6)
Location: LACON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in KNOX, ILLINOIS
From 10-JUN-15 17:30:00 to 10-JUN-15 17:35:00 (CST-6)
Location: GILSON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in MARSHALL, ILLINOIS
From 10-JUN-15 18:02:00 to 10-JUN-15 18:07:00 (CST-6)
Location: LACON MARSHALL CO AR
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MARSHALL, ILLINOIS
From 10-JUN-15 18:05:00 to 10-JUN-15 18:10:00 (CST-6)
Location: SPARLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in KNOX, ILLINOIS
From 10-JUN-15 19:08:00 to 10-JUN-15 19:13:00 (CST-6)
Location: WILLIAMSFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in WOODFORD, ILLINOIS
From 10-JUN-15 19:08:00 to 10-JUN-15 19:13:00 (CST-6)
Location: CAZENOVIA
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in PEORIA, ILLINOIS
From 10-JUN-15 19:28:00 to 10-JUN-15 19:33:00 (CST-6)
Location: MONICA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in KNOX, ILLINOIS
From 10-JUN-15 19:45:00 to 10-JUN-15 19:50:00 (CST-6)
Location: GALESBURG
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in KNOX, ILLINOIS
From 10-JUN-15 20:40:00 to 10-JUN-15 20:45:00 (CST-6)
Location: ABINGDON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in KNOX, ILLINOIS
From 10-JUN-15 20:40:00 to 10-JUN-15 20:45:00 (CST-6)
Location: KNOXVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in FULTON, ILLINOIS
From 10-JUN-15 22:15:00 to 10-JUN-15 22:20:00 (CST-6)
Location: IPAVA
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash Flood in MARSHALL, ILLINOIS
From 10-JUN-15 18:45:00 to 11-JUN-15 04:00:00 (CST-6)
Location: CAMP GROVE
Flood cause: Heavy Rain
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Rainfall rates of an inch per hour for nearly four hours produced 3.00 to 5.00 of rain in western and central Marshall County. Flash flooding resulted in the closure of Illinois State Highway 17 in much of the county. Part of Illinois State Highway 26 about 6 miles north of Lacon washed out. Rural roads were impassable from Camp Grove to Hopewell to Varna. Mud and debris from cornfields had to be plowed to reopen some of the rural roads.

Flash Flood in WOODFORD, ILLINOIS
From 10-JUN-15 19:30:00 to 11-JUN-15 04:00:00 (CST-6)
Location: WASHBURN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Steady rainfall accumulated up to 4.00 on already saturated ground in northern Woodford County during the evening of June 10th. Illinois Route 89 from Low Point through Washburn to the Marshall County line was closed due to high water. Most rural roads in northern Woodford County were impassable.

Flash Flood in KNOX, ILLINOIS
From 10-JUN-15 22:30:00 to 11-JUN-15 03:45:00 (CST-6)
Location: (GBG)GALESBURG ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rainfall of 4.00 to 6.00 was measured in southern Knox County on ground already saturated from flooding three days prior. Illinois Route 97 from Gilson to the Fulton County line and Routes 8 and 78 from Maquon to the Peoria County line were impassable. Nearly all rural roads in southern Knox County were flooded. Streets in Abingdon, Maquon and Yates City were also inundated by the heavy rain and flooding.

Flash Flood in SCHUYLER, ILLINOIS
From 11-JUN-15 01:15:00 to 11-JUN-15 04:00:00 (CST-6)
Location: RAY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rainfall ranging from 2.50 to 4.00 resulted in rapid flooding of rural roads east of U.S. Highway 24 in northeast Schuyler County. Rural roads were also impassable north of the village of Ray, near the Fulton/McDonough County lines.

Thunderstorm Wind in MARSHALL, ILLINOIS
From 10-JUN-15 18:06:00 to 10-JUN-15 18:11:00 (CST-6)
Location: LACON
Magnitude: 52.00 EG
Property damage: 18.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two trees and numerous tree branches were blown down in Lacon.

Thunderstorm Wind in MARSHALL, ILLINOIS
From 10-JUN-15 18:40:00 to 10-JUN-15 18:45:00 (CST-6)
Location: SPARLAND
Magnitude: 52.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Ten to fifteen power poles were blown down at Yankee Lane and County Road 800 North just northwest of Sparland.

Thunderstorm Wind in KNOX, ILLINOIS
From 10-JUN-15 20:40:00 to 10-JUN-15 20:45:00 (CST-6)
Location: ABINGDON
Magnitude: 52.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous tree branches were blown down.

Thunderstorm Wind in TAZEWELL, ILLINOIS
From 10-JUN-15 20:45:00 to 10-JUN-15 20:50:00 (CST-6)
Location: MARQUETTE HGTS
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A 10-inch diameter tree was blown down at Douglas and Pontiac streets in Marquette Heights.

Thunderstorm Wind in TAZEWELL, ILLINOIS
From 10-JUN-15 20:45:00 to 10-JUN-15 20:50:00 (CST-6)
Location: CREVE COEUR
Magnitude: 52.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and power lines were blown down.  A few trees fell onto houses.

Thunderstorm Wind in TAZEWELL, ILLINOIS
From 10-JUN-15 20:45:00 to 10-JUN-15 20:50:00 (CST-6)
Location: MARQUETTE HGTS
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A 16-inch diameter tree split and blocked the road.

Thunderstorm Wind in TAZEWELL, ILLINOIS
From 10-JUN-15 20:45:00 to 10-JUN-15 20:50:00 (CST-6)
Location: EAST PEORIA
Magnitude: 52.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and power lines were blown down.

Thunderstorm Wind in TAZEWELL, ILLINOIS
From 10-JUN-15 20:50:00 to 10-JUN-15 20:55:00 (CST-6)
Location: PEKIN
Magnitude: 52.00 EG
Property damage: 80.00K
Crop damage: 0.00K
Reported by: Mesonet

Numerous trees and tree branches were blown down.

Thunderstorm Wind in TAZEWELL, ILLINOIS
From 10-JUN-15 21:00:00 to 10-JUN-15 21:05:00 (CST-6)
Location: WASHINGTON
Magnitude: 52.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees and power lines were blown down.

Thunderstorm Wind in WOODFORD, ILLINOIS
From 10-JUN-15 20:00:00 to 10-JUN-15 20:05:00 (CST-6)
Location: GERMANTOWN HILLS
Magnitude: 52.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down onto Route 116 southwest of Germantown Hills.

Flash Flood in FULTON, ILLINOIS
From 11-JUN-15 00:30:00 to 11-JUN-15 04:00:00 (CST-6)
Location: TABLE GROVE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Rainfall amounts of 2.50 to 4.00 were measured in western Fulton County in areas already saturated three days earlier. U.S. Highway 136 from Ipava to Table Grove was impassable in many spots. Several rural roads in the extreme western and southwest part of Fulton County were closed.

Flash Flood in PEORIA, ILLINOIS
From 10-JUN-15 20:00:00 to 11-JUN-15 03:30:00 (CST-6)
Location: ELMORE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rainfall of 2.50 to 5.00 was measured in a large part of Peoria County, mainly outside the city of Peoria, on ground already saturated from flooding three days prior. Parts of Illinois Routes 8, 29, 40, 6, 90 and 91 were impassable. Streets in Chillicothe, Mossville, Princeville and Elmwood were also flooded.

Thunderstorm Wind in TAZEWELL, ILLINOIS
From 10-JUN-15 21:00:00 to 10-JUN-15 21:05:00 (CST-6)
Location: TREMONT
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A 14 to 16-inch diameter tree was blown down onto Townline Road at the Mackinaw River Bridge.

Flash Flood in FULTON, ILLINOIS
From 10-JUN-15 22:30:00 to 11-JUN-15 03:30:00 (CST-6)
Location: GILCHRIST
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rainfall of 2.50 to 5.00 was measured in extreme northern Fulton County on ground already saturated from flooding three days prior. Illinois Route 97 north of Fairview to the Knox County line and much of Route 116 to the Peoria County line were impassable. Streets in Farmington and London Mills were also flooded.