An upper-level disturbance associated with a large cluster of thunderstorms that had developed over the Plains during the previous night tracked eastward and triggered additional strong to severe thunderstorms across central Illinois during the afternoon of May 11th.  Many of the storms produced wind gusts in excess of 60 mph and hail larger than pennies.  The largest hailstones measuring 2 inches in diameter were reported just west of Monticello in Piatt County.  Once this initial round of convection exited central Illinois, additional storms developed well ahead of an approaching cold front during the evening hours.  These storms produced mainly sub-severe hail along and west of the Illinois River.

Hail in LOGAN, ILLINOIS
From 11-MAY-16 13:00:00 to 11-MAY-16 13:05:00 (CST-6)
Location: ELKHART
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in CASS, ILLINOIS
From 11-MAY-16 12:15:00 to 11-MAY-16 12:20:00 (CST-6)
Location: ASHLAND
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LOGAN, ILLINOIS
From 11-MAY-16 13:15:00 to 11-MAY-16 13:20:00 (CST-6)
Location: LATHAM
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in PIATT, ILLINOIS
From 11-MAY-16 14:21:00 to 11-MAY-16 14:26:00 (CST-6)
Location: MONTICELLO
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in PIATT, ILLINOIS
From 11-MAY-16 14:24:00 to 11-MAY-16 14:29:00 (CST-6)
Location: MONTICELLO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PIATT, ILLINOIS
From 11-MAY-16 14:05:00 to 11-MAY-16 14:10:00 (CST-6)
Location: CISCO
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SANGAMON, ILLINOIS
From 11-MAY-16 12:40:00 to 11-MAY-16 12:45:00 (CST-6)
Location: CANTRALL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MENARD, ILLINOIS
From 11-MAY-16 12:40:00 to 11-MAY-16 12:45:00 (CST-6)
Location: ATHENS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JASPER, ILLINOIS
From 11-MAY-16 15:40:00 to 11-MAY-16 15:45:00 (CST-6)
Location: ST MARIE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in VERMILION, ILLINOIS
From 11-MAY-16 15:55:00 to 11-MAY-16 16:00:00 (CST-6)
Location: HENNING
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in EFFINGHAM, ILLINOIS
From 11-MAY-16 15:25:00 to 11-MAY-16 15:30:00 (CST-6)
Location: WATSON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees were bent and hanging over the road at Route 37.

Thunderstorm Wind in MENARD, ILLINOIS
From 11-MAY-16 12:30:00 to 11-MAY-16 12:35:00 (CST-6)
Location: CURTIS
Magnitude: 61.00 EG
Property damage: 45.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Seven power poles were snapped at Cline St and Illinois Route 123 east of Petersburg.

Thunderstorm Wind in MENARD, ILLINOIS
From 11-MAY-16 12:33:00 to 11-MAY-16 12:38:00 (CST-6)
Location: CULVER
Magnitude: 61.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees were blown down near Illinois Route 29 and Indian Point Road.

Thunderstorm Wind in MENARD, ILLINOIS
From 11-MAY-16 12:39:00 to 11-MAY-16 12:44:00 (CST-6)
Location: PETERSBURG
Magnitude: 61.00 EG
Property damage: 18.00K
Crop damage: 0.00K
Reported by: Mesonet

Multiple tree limbs were blown down and an apple tree was snapped at the base.

Thunderstorm Wind in LOGAN, ILLINOIS
From 11-MAY-16 13:15:00 to 11-MAY-16 13:20:00 (CST-6)
Location: MT PULASKI
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Several large tree limbs were blown down in Mt. Pulaski.

Thunderstorm Wind in CHAMPAIGN, ILLINOIS
From 11-MAY-16 14:55:00 to 11-MAY-16 15:00:00 (CST-6)
Location: CHAMPAIGN
Magnitude: 61.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Two large trees were blown over in Champaign.

Thunderstorm Wind in EFFINGHAM, ILLINOIS
From 11-MAY-16 15:25:00 to 11-MAY-16 15:30:00 (CST-6)
Location: MASON
Magnitude: 61.00 EG
Property damage: 85.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and power lines were blown down along the Mason Eberle Road.

Thunderstorm Wind in EFFINGHAM, ILLINOIS
From 11-MAY-16 15:30:00 to 11-MAY-16 15:35:00 (CST-6)
Location: EFFINGHAM CO MEM ARP
Magnitude: 61.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Power lines were blown down one mile south of the Effingham County Airport.

Thunderstorm Wind in JASPER, ILLINOIS
From 11-MAY-16 15:38:00 to 11-MAY-16 15:43:00 (CST-6)
Location: WHEELER
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Railroad crossing arms were broken off.