A powerful low pressure system tracked from the central Rockies toward the southern Great Lakes on November 17th.  As the system approached central Illinois, unseasonably warm and humid air was pulled northward into the area, resulting in high temperatures soaring into the 70s.  This very unstable airmass coupled with strong jet stream level winds aloft created numerous strong to severe thunderstorms across the area.  Many of the storms became supercells, producing hail as large as 4 inches in diameter and wind gusts exceeding 70 mph.

Hail in MCLEAN, ILLINOIS
From 17-NOV-13 11:57:00 to 17-NOV-13 11:58:00 (CST-6)
Location: NORMAL
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in PEORIA, ILLINOIS
From 17-NOV-13 10:25:00 to 17-NOV-13 10:26:00 (CST-6)
Location: PRINCEVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in CASS, ILLINOIS
From 17-NOV-13 11:09:00 to 17-NOV-13 11:10:00 (CST-6)
Location: PHILADELPHIA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in WOODFORD, ILLINOIS
From 17-NOV-13 11:10:00 to 17-NOV-13 11:11:00 (CST-6)
Location: METAMORA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCLEAN, ILLINOIS
From 17-NOV-13 11:36:00 to 17-NOV-13 11:37:00 (CST-6)
Location: NORMAL
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in MENARD, ILLINOIS
From 17-NOV-13 11:25:00 to 17-NOV-13 11:26:00 (CST-6)
Location: PETERSBURG
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in MENARD, ILLINOIS
From 17-NOV-13 11:26:00 to 17-NOV-13 11:27:00 (CST-6)
Location: PETERSBURG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in TAZEWELL, ILLINOIS
From 17-NOV-13 11:28:00 to 17-NOV-13 11:29:00 (CST-6)
Location: ARMINGTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in CHRISTIAN, ILLINOIS
From 17-NOV-13 11:53:00 to 17-NOV-13 11:54:00 (CST-6)
Location: MORRISONVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCLEAN, ILLINOIS
From 17-NOV-13 12:00:00 to 17-NOV-13 12:01:00 (CST-6)
Location: COVEL
Magnitude: 4.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CHRISTIAN, ILLINOIS
From 17-NOV-13 12:14:00 to 17-NOV-13 12:15:00 (CST-6)
Location: ASSUMPTION
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in MCLEAN, ILLINOIS
From 17-NOV-13 11:26:00 to 17-NOV-13 11:27:00 (CST-6)
Location: MC LEAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MENARD, ILLINOIS
From 17-NOV-13 11:30:00 to 17-NOV-13 11:35:00 (CST-6)
Location: GREENVIEW
Magnitude: 61.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several large trees and power lines were blown down on Rt. 29.

Thunderstorm Wind in MCLEAN, ILLINOIS
From 17-NOV-13 12:15:00 to 17-NOV-13 12:20:00 (CST-6)
Location: (BMI)BLOOMNGTN/NORMA
Magnitude: 61.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Public

Several large power poles were blown down along Towanda Barnes Road.

Thunderstorm Wind in CHAMPAIGN, ILLINOIS
From 17-NOV-13 12:30:00 to 17-NOV-13 12:35:00 (CST-6)
Location: MAHOMET
Magnitude: 71.00 EG
Property damage: 7.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree and numerous large tree branches were blown down around Mahomet.

Thunderstorm Wind in MARSHALL, ILLINOIS
From 17-NOV-13 11:10:00 to 17-NOV-13 11:15:00 (CST-6)
Location: HENRY
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was uprooted and a 10-inch diameter pine tree was snapped off and blown against a house.

Thunderstorm Wind in LOGAN, ILLINOIS
From 17-NOV-13 11:17:00 to 17-NOV-13 11:22:00 (CST-6)
Location: HARTSBURG
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A semi was blown over on I-155 and the roof of a school was damaged near Hartsburg.

Thunderstorm Wind in MENARD, ILLINOIS
From 17-NOV-13 11:22:00 to 17-NOV-13 11:27:00 (CST-6)
Location: PETERSBURG
Magnitude: 52.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several tree limbs were blown down in Petersburg.

Thunderstorm Wind in CHRISTIAN, ILLINOIS
From 17-NOV-13 11:50:00 to 17-NOV-13 11:55:00 (CST-6)
Location: TAYLORVILLE
Magnitude: 61.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Power lines were blown down just south of Taylorville.

Thunderstorm Wind in MCLEAN, ILLINOIS
From 17-NOV-13 11:57:00 to 17-NOV-13 12:02:00 (CST-6)
Location: NORMAL
Magnitude: 61.00 EG
Property damage: 225.00K
Crop damage: 0.00K
Reported by: Public

A tree was blown down and numerous roofs were damaged near the Illinois State University campus in Normal.

Thunderstorm Wind in PIATT, ILLINOIS
From 17-NOV-13 12:22:00 to 17-NOV-13 12:27:00 (CST-6)
Location: MANSFIELD
Magnitude: 61.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A large tree was blown over and several small branches were knocked down.  One small storage shed was flipped over.

Thunderstorm Wind in MCLEAN, ILLINOIS
From 17-NOV-13 12:28:00 to 17-NOV-13 12:33:00 (CST-6)
Location: SAYBROOK
Magnitude: 61.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees were uprooted and numerous homes had shingle damage in Saybrook.

Thunderstorm Wind in SHELBY, ILLINOIS
From 17-NOV-13 12:30:00 to 17-NOV-13 12:35:00 (CST-6)
Location: FINDLAY
Magnitude: 61.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several power poles were snapped off south of Findlay.

Thunderstorm Wind in CHAMPAIGN, ILLINOIS
From 17-NOV-13 12:30:00 to 17-NOV-13 12:35:00 (CST-6)
Location: MAHOMET
Magnitude: 61.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several power poles were blown down along County Line Road near the Mahomet Township Shed.

Thunderstorm Wind in CHAMPAIGN, ILLINOIS
From 17-NOV-13 12:30:00 to 17-NOV-13 12:35:00 (CST-6)
Location: MAHOMET
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several power poles were pushed over, but not completely blown down along Spring Lake Road south of Rt. 150.

Thunderstorm Wind in DOUGLAS, ILLINOIS
From 17-NOV-13 12:45:00 to 17-NOV-13 12:50:00 (CST-6)
Location: GALTON
Magnitude: 61.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A grain elevator was damaged.

Thunderstorm Wind in DOUGLAS, ILLINOIS
From 17-NOV-13 12:45:00 to 17-NOV-13 12:50:00 (CST-6)
Location: ARTHUR
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: COOP Observer

A portable buildings factory was damaged about 2.8 miles northeast of Arthur at 240E and 575N.

Thunderstorm Wind in VERMILION, ILLINOIS
From 17-NOV-13 13:11:00 to 17-NOV-13 13:16:00 (CST-6)
Location: DANVILLE
Magnitude: 61.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A roof was blown off a house.

Thunderstorm Wind in CHAMPAIGN, ILLINOIS
From 17-NOV-13 12:48:00 to 17-NOV-13 12:53:00 (CST-6)
Location: PESOTUM
Magnitude: 61.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several grain bins were destroyed, a garage was damaged, and power lines were blown down south of Pesotum.

Thunderstorm Wind in DOUGLAS, ILLINOIS
From 17-NOV-13 13:00:00 to 17-NOV-13 13:05:00 (CST-6)
Location: NEWMAN
Magnitude: 61.00 EG
Property damage: 80.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous power poles and trees were blown down and a pole barn had its roof blown off.

Thunderstorm Wind in PEORIA, ILLINOIS
From 17-NOV-13 10:45:00 to 17-NOV-13 10:50:00 (CST-6)
Location: DUNLAP
Magnitude: 61.00 EG
Property damage: 85.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Two grain bins, a conveyor belt, and two small buildings were damaged in Dunlap.