A vigorous upper-level disturbance tracking through the Upper Midwest interacted with an approaching cold front to trigger scattered strong to severe thunderstorms across central Illinois during the afternoon and evening of August 18th.  Due to increasing low-level wind shear, a number of the storms began to rotate and produce funnel clouds.  One storm produced a weak tornado in Tazewell County just east of Mackinaw.  Other cells created scattered damaging wind gusts of around 60 mph and hail as large as quarters.

Hail in FULTON, ILLINOIS
From 18-AUG-15 15:56:00 to 18-AUG-15 16:01:00 (CST-6)
Location: FARMINGTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Lightning in PEORIA, ILLINOIS
From 18-AUG-15 16:30:00 to 18-AUG-15 16:31:00 (CST-6)
Location: BARTONVILLE
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A lightning strike caused a mobile home to catch fire in Bartonville.

Thunderstorm Wind in MARSHALL, ILLINOIS
From 18-AUG-15 16:50:00 to 18-AUG-15 16:55:00 (CST-6)
Location: SPARLAND
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The roof of a small pole barn was blown off about 2 miles west of Sparland.

Thunderstorm Wind in PEORIA, ILLINOIS
From 18-AUG-15 16:13:00 to 18-AUG-15 16:18:00 (CST-6)
Location: OAK HILL
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees were damaged near Eden and Route 8.

Thunderstorm Wind in TAZEWELL, ILLINOIS
From 18-AUG-15 16:53:00 to 18-AUG-15 16:58:00 (CST-6)
Location: HOPEDALE
Magnitude: 52.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A 45 by 50-foot pole barn under construction was blown over.

Thunderstorm Wind in TAZEWELL, ILLINOIS
From 18-AUG-15 16:55:00 to 18-AUG-15 17:00:00 (CST-6)
Location: HOPEDALE
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A power line was blown down on Oak Street in Hopedale.

Tornado in TAZEWELL, ILLINOIS
From 18-AUG-15 17:09:00 to 18-AUG-15 17:11:00 (CST-6)
Location: MACKINAW
Tornado F-scale: EF0
Property damage: 30.00K
Crop damage: 8.00K
Reported by: Emergency Manager

A tornado touched down 1.7 miles east-southeast of Mackinaw at 6:09 PM CDT.  The tornado tracked northeastward for 2 miles, damaging several pine trees, downing tree limbs onto 3 houses, and damaging crops in a path 50 to 75 yards wide.  The tornado dissipated in a wooded area 2.7 miles east-northeast of Mackinaw at 6:11 PM CDT.

Thunderstorm Wind in WOODFORD, ILLINOIS
From 18-AUG-15 17:12:00 to 18-AUG-15 17:17:00 (CST-6)
Location: CONGERVILLE
Magnitude: 52.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Numerous 4 to 6-inch diameter tree branches were blown down in Congerville.

Thunderstorm Wind in COLES, ILLINOIS
From 18-AUG-15 18:45:00 to 18-AUG-15 18:50:00 (CST-6)
Location: ASHMORE
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several 5-inch diameter tree branches were blown down west of Ashmore.

Thunderstorm Wind in WOODFORD, ILLINOIS
From 18-AUG-15 17:15:00 to 18-AUG-15 17:20:00 (CST-6)
Location: GOODFIELD
Magnitude: 52.00 EG
Property damage: 45.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A few trees were blown down along I-74 near mile marker 112 and damage was done to the roof of a barn/dinner theater near Goodfield.