A vigorous upper-level disturbance interacting with an approaching cold front triggered scattered severe thunderstorms across north-central Illinois during the afternoon and early evening of August 9th.  Most of the storms impacted locations along and north of a Peoria...to Bloomington...to Paris line.  Downburst winds of 70 to 80 mph produced extensive damage across McLean County from near Danvers to just north of Heyworth.  Other cells produced widespread wind damage across Champaign and Edgar counties.  In addition to the wind damage, large hail up to the size of half dollars was reported north of Heyworth in McLean County.

Thunderstorm Wind in MARSHALL, ILLINOIS
From 09-AUG-12 14:35:00 to 09-AUG-12 14:40:00 (CST-6)
Location: TOLUCA
Magnitude: 52.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and power lines were blown down in Toluca.

Thunderstorm Wind in PEORIA, ILLINOIS
From 09-AUG-12 14:05:00 to 09-AUG-12 14:10:00 (CST-6)
Location: MOSSVILLE
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 12-inch diameter tree was blown down, bringing a power line down with it.  A road was blocked by the tree.

Thunderstorm Wind in MCLEAN, ILLINOIS
From 09-AUG-12 15:06:00 to 09-AUG-12 15:08:00 (CST-6)
Location: DANVERS
Magnitude: 70.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and tree branches were blown down in Danvers.

Thunderstorm Wind in CHAMPAIGN, ILLINOIS
From 09-AUG-12 16:45:00 to 09-AUG-12 16:50:00 (CST-6)
Location: CHAMPAIGN
Magnitude: 61.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong thunderstorm winds produced damage across a 2 square mile area on the west and southwest side of Champaign.  Numerous tree branches and power lines were blown down, creating a power outage for several hours.  The damage was bounded by Springfield Avenue on the north, Prospect Avenue on the east, Windsor Avenue on the south, and Duncan Road on the west.

Thunderstorm Wind in EDGAR, ILLINOIS
From 09-AUG-12 17:35:00 to 09-AUG-12 17:40:00 (CST-6)
Location: METCALF
Magnitude: 61.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Mesonet

Three large trees were blown down.

Thunderstorm Wind in CHAMPAIGN, ILLINOIS
From 09-AUG-12 17:06:00 to 09-AUG-12 17:11:00 (CST-6)
Location: SIDNEY
Magnitude: 61.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous tree branches were blown down.

Thunderstorm Wind in CHAMPAIGN, ILLINOIS
From 09-AUG-12 17:05:00 to 09-AUG-12 17:10:00 (CST-6)
Location: BLOCK
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Ten train cars were derailed by strong winds about 3 miles south of Sidney.

Thunderstorm Wind in CHAMPAIGN, ILLINOIS
From 09-AUG-12 17:06:00 to 09-AUG-12 17:11:00 (CST-6)
Location: SIDNEY
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 35.00K
Reported by: Trained Spotter

A few trees were topped and several power lines were blown down just south of Sidney.  In addition, a corn field was flattened.

Thunderstorm Wind in CHAMPAIGN, ILLINOIS
From 09-AUG-12 17:06:00 to 09-AUG-12 17:11:00 (CST-6)
Location: SIDNEY
Magnitude: 61.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree branch was blown onto a vehicle on County Road 1100 North about 1.5 miles north of Sidney.

Thunderstorm Wind in CHAMPAIGN, ILLINOIS
From 09-AUG-12 17:15:00 to 09-AUG-12 17:20:00 (CST-6)
Location: BROADLANDS
Magnitude: 61.00 EG
Property damage: 350.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and tree branches were blown down.  Roof damage was reported to 29 structures.  A garage was destroyed and several machine sheds were severely damaged or destroyed.  In addition, a grain silo was damaged.

Thunderstorm Wind in EDGAR, ILLINOIS
From 09-AUG-12 17:33:00 to 09-AUG-12 17:38:00 (CST-6)
Location: HUME
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Three power poles were snapped and several tree branches were blown down.

Thunderstorm Wind in MCLEAN, ILLINOIS
From 09-AUG-12 15:08:00 to 09-AUG-12 15:20:00 (CST-6)
Location: DANVERS
Magnitude: 70.00 EG
Property damage: 3.50M
Crop damage: 0.00K
Reported by: Emergency Manager

Downburst winds of 70 to 80 mph produced a wide swath of damage from Danvers southeastward into the southwest side of Bloomington.  One of the hardest hit locations along this path was the Apollo Acres subdivision just north of Illinois Route 9, where 159 homes sustained damage.  139 of those homes had awnings or shingles damaged, while 19 suffered minor roof and window damage, and 1 home had one-third of its roof torn off.  Total damage in Apollo Acres was around $1 million.  Other significant damage occurred along the path of the storm, including numerous downed trees, trailers blown over, and several large metal buildings with doors blown in and roofs torn off.  Total damage to 30 businesses along the path was estimated at around $2.5 million.  One minor injury was reported, as a car was hit by a wind-blown trailer.

Hail in MARSHALL, ILLINOIS
From 09-AUG-12 14:35:00 to 09-AUG-12 14:36:00 (CST-6)
Location: TOLUCA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in MARSHALL, ILLINOIS
From 09-AUG-12 14:35:00 to 09-AUG-12 14:36:00 (CST-6)
Location: WENONA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in MCLEAN, ILLINOIS
From 09-AUG-12 15:25:00 to 09-AUG-12 15:26:00 (CST-6)
Location: BLOOMINGTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in MCLEAN, ILLINOIS
From 09-AUG-12 15:25:00 to 09-AUG-12 15:26:00 (CST-6)
Location: TWIN GROVE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in MCLEAN, ILLINOIS
From 09-AUG-12 15:35:00 to 09-AUG-12 15:36:00 (CST-6)
Location: HEYWORTH
Magnitude: 1.50 
Property damage: 0.00K
Reported by: Mesonet

Hail damaged crops along a 1.5 mile-long/50 yards-wide swath just north of Heyworth.

Thunderstorm Wind in CHAMPAIGN, ILLINOIS
From 09-AUG-12 17:07:00 to 09-AUG-12 17:15:00 (CST-6)
Location: PHILO
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several tree limbs were blown down.

Hail in CHAMPAIGN, ILLINOIS
From 09-AUG-12 17:00:00 to 09-AUG-12 17:01:00 (CST-6)
Location: PHILO
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCLEAN, ILLINOIS
From 09-AUG-12 15:27:00 to 09-AUG-12 15:28:00 (CST-6)
Location: BLOOMINGTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee