A strong cold front interacting with a highly unstable airmass triggered several rounds of thunderstorms across central Illinois during the afternoon of May 22nd.  Numerous reports of large hail were received, with up to golfball-sized stones occurring across parts of Mason County.  In addition, 60 to 70 mph winds downed trees across Knox County.

Hail in SANGAMON, ILLINOIS
From 22-MAY-11 14:40:00 to 22-MAY-11 14:41:00 (CST-6)
Location: LELAND GROVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in KNOX, ILLINOIS
From 22-MAY-11 16:31:00 to 22-MAY-11 16:32:00 (CST-6)
Location: RIO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in FULTON, ILLINOIS
From 22-MAY-11 16:55:00 to 22-MAY-11 16:56:00 (CST-6)
Location: CANTON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in FULTON, ILLINOIS
From 22-MAY-11 16:58:00 to 22-MAY-11 16:59:00 (CST-6)
Location: CANTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in PEORIA, ILLINOIS
From 22-MAY-11 17:11:00 to 22-MAY-11 17:12:00 (CST-6)
Location: TRIVOLI
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in PEORIA, ILLINOIS
From 22-MAY-11 17:16:00 to 22-MAY-11 17:17:00 (CST-6)
Location: HANNA CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in FULTON, ILLINOIS
From 22-MAY-11 17:29:00 to 22-MAY-11 17:30:00 (CST-6)
Location: ST DAVID
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in PEORIA, ILLINOIS
From 22-MAY-11 17:37:00 to 22-MAY-11 17:38:00 (CST-6)
Location: GLASFORD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in TAZEWELL, ILLINOIS
From 22-MAY-11 17:50:00 to 22-MAY-11 17:51:00 (CST-6)
Location: NORTH PEKIN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in KNOX, ILLINOIS
From 22-MAY-11 19:00:00 to 22-MAY-11 19:01:00 (CST-6)
Location: ABINGDON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in TAZEWELL, ILLINOIS
From 22-MAY-11 17:50:00 to 22-MAY-11 17:55:00 (CST-6)
Location: PEKIN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in TAZEWELL, ILLINOIS
From 22-MAY-11 13:00:00 to 22-MAY-11 13:05:00 (CST-6)
Location: MORTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in MASON, ILLINOIS
From 22-MAY-11 12:22:00 to 22-MAY-11 12:23:00 (CST-6)
Location: MANITO
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in MASON, ILLINOIS
From 22-MAY-11 12:23:00 to 22-MAY-11 12:24:00 (CST-6)
Location: MANITO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MASON, ILLINOIS
From 22-MAY-11 12:27:00 to 22-MAY-11 12:28:00 (CST-6)
Location: MANITO
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in TAZEWELL, ILLINOIS
From 22-MAY-11 12:46:00 to 22-MAY-11 12:47:00 (CST-6)
Location: TREMONT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in MORGAN, ILLINOIS
From 22-MAY-11 13:05:00 to 22-MAY-11 13:06:00 (CST-6)
Location: JACKSONVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in MORGAN, ILLINOIS
From 22-MAY-11 13:10:00 to 22-MAY-11 13:11:00 (CST-6)
Location: JACKSONVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in TAZEWELL, ILLINOIS
From 22-MAY-11 13:10:00 to 22-MAY-11 13:11:00 (CST-6)
Location: DEER CREEK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in WOODFORD, ILLINOIS
From 22-MAY-11 13:15:00 to 22-MAY-11 13:16:00 (CST-6)
Location: GOODFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in WOODFORD, ILLINOIS
From 22-MAY-11 13:26:00 to 22-MAY-11 13:27:00 (CST-6)
Location: EUREKA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in MENARD, ILLINOIS
From 22-MAY-11 13:29:00 to 22-MAY-11 13:30:00 (CST-6)
Location: LINCNS NEW SALEM ST
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WOODFORD, ILLINOIS
From 22-MAY-11 13:31:00 to 22-MAY-11 13:32:00 (CST-6)
Location: SECOR
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in MENARD, ILLINOIS
From 22-MAY-11 13:33:00 to 22-MAY-11 13:34:00 (CST-6)
Location: ATHENS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in LOGAN, ILLINOIS
From 22-MAY-11 13:35:00 to 22-MAY-11 13:36:00 (CST-6)
Location: MIDDLETOWN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in WOODFORD, ILLINOIS
From 22-MAY-11 13:40:00 to 22-MAY-11 13:41:00 (CST-6)
Location: SECOR
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in MENARD, ILLINOIS
From 22-MAY-11 13:44:00 to 22-MAY-11 13:45:00 (CST-6)
Location: PETERSBURG
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in MENARD, ILLINOIS
From 22-MAY-11 13:45:00 to 22-MAY-11 13:46:00 (CST-6)
Location: ATHENS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in MORGAN, ILLINOIS
From 22-MAY-11 14:00:00 to 22-MAY-11 14:01:00 (CST-6)
Location: FRANKLIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in LOGAN, ILLINOIS
From 22-MAY-11 14:05:00 to 22-MAY-11 14:06:00 (CST-6)
Location: ELKHART
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in SANGAMON, ILLINOIS
From 22-MAY-11 14:11:00 to 22-MAY-11 14:12:00 (CST-6)
Location: WILLIAMSVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in SANGAMON, ILLINOIS
From 22-MAY-11 14:35:00 to 22-MAY-11 14:36:00 (CST-6)
Location: SPRINGFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in SANGAMON, ILLINOIS
From 22-MAY-11 14:37:00 to 22-MAY-11 14:38:00 (CST-6)
Location: SPRINGFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in SANGAMON, ILLINOIS
From 22-MAY-11 14:40:00 to 22-MAY-11 14:41:00 (CST-6)
Location: SOUTHERN VIEW
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in DE WITT, ILLINOIS
From 22-MAY-11 14:38:00 to 22-MAY-11 14:43:00 (CST-6)
Location: CLINTON
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown onto a powerline, causing a brief power outage.

Thunderstorm Wind in KNOX, ILLINOIS
From 22-MAY-11 18:25:00 to 22-MAY-11 18:30:00 (CST-6)
Location: DAHINDA
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Mesonet

An 8-inch diameter tree was blown down onto U.S. 150 about 1/4 mile east of the Spoon River.

Thunderstorm Wind in KNOX, ILLINOIS
From 22-MAY-11 18:30:00 to 22-MAY-11 18:35:00 (CST-6)
Location: DOUGLAS
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The roof of a hog pen was damaged by strong winds 3 miles north of Douglas.

Thunderstorm Wind in KNOX, ILLINOIS
From 22-MAY-11 18:40:00 to 22-MAY-11 18:45:00 (CST-6)
Location: CENTERVILLE
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees were blown down, blocking both lanes of the access road to the Lake Calhoun Golf Course.