A stationary frontal boundary extending across south-central Illinois provided the focus for thunderstorm development during the afternoon and evening of May 15th.  One supercell formed in Christian County and produced an EF-0 tornado east of Palmer.  A second supercell developed further east in Moultrie County, then tracked eastward to the Indiana border producing sporadic wind damage and hail as large as golf balls.

Thunderstorm Wind in MOULTRIE, ILLINOIS
From 15-MAY-18 15:15:00 to 15-MAY-18 15:20:00 (CST-6)
Location: BETHANY
Magnitude: 61.00 EG
Property damage: 125.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous tree limbs, power poles, and power lines were blown down between Bethany and Sullivan.

Thunderstorm Wind in MOULTRIE, ILLINOIS
From 15-MAY-18 15:17:00 to 15-MAY-18 15:22:00 (CST-6)
Location: SULLIVAN
Magnitude: 70.00 EG
Property damage: 350.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Roofs were ripped off several houses, trees were blown down, and a machine shed was knocked down on the southeast side of Sullivan.

Hail in MOULTRIE, ILLINOIS
From 15-MAY-18 15:15:00 to 15-MAY-18 15:20:00 (CST-6)
Location: SULLIVAN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MOULTRIE, ILLINOIS
From 15-MAY-18 15:15:00 to 15-MAY-18 15:20:00 (CST-6)
Location: SULLIVAN
Magnitude: 52.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several ornamental trees were damaged and shingles were torn off a roof.

Hail in CLARK, ILLINOIS
From 15-MAY-18 16:42:00 to 15-MAY-18 16:47:00 (CST-6)
Location: WESTFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MOULTRIE, ILLINOIS
From 15-MAY-18 14:55:00 to 15-MAY-18 15:00:00 (CST-6)
Location: BETHANY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A tree was snapped in Bethany.

Thunderstorm Wind in MOULTRIE, ILLINOIS
From 15-MAY-18 15:17:00 to 15-MAY-18 15:22:00 (CST-6)
Location: SULLIVAN
Magnitude: 61.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A machine shed was blown down just east of Sullivan.

Thunderstorm Wind in COLES, ILLINOIS
From 15-MAY-18 16:10:00 to 15-MAY-18 16:15:00 (CST-6)
Location: MATTOON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several large tree limbs were blown down.

Thunderstorm Wind in CLARK, ILLINOIS
From 15-MAY-18 16:42:00 to 15-MAY-18 16:47:00 (CST-6)
Location: WESTFIELD
Magnitude: 61.00 EG
Property damage: 42.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several power poles were blown down along IL-49 south of Westfield.

Tornado in CHRISTIAN, ILLINOIS
From 15-MAY-18 15:37:00 to 15-MAY-18 15:44:00 (CST-6)
Location: CLARKSDALE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tornado touched down in an open field 3.7 miles east of Palmer at 4:37pm CDT.  The tornado traveled southeastward, then dissipated about 5.2 miles east-southeast of Palmer at 4:44pm CDT.  No damage was reported.

Hail in MOULTRIE, ILLINOIS
From 15-MAY-18 15:05:00 to 15-MAY-18 15:10:00 (CST-6)
Location: BETHANY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in COLES, ILLINOIS
From 15-MAY-18 16:29:00 to 15-MAY-18 16:34:00 (CST-6)
Location: CHARLESTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in COLES, ILLINOIS
From 15-MAY-18 16:32:00 to 15-MAY-18 16:37:00 (CST-6)
Location: CHARLESTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in COLES, ILLINOIS
From 15-MAY-18 16:42:00 to 15-MAY-18 16:47:00 (CST-6)
Location: HUTTON
Magnitude: 61.00 EG
Property damage: 24.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Powerlines were blown down.

Thunderstorm Wind in CLARK, ILLINOIS
From 15-MAY-18 17:15:00 to 15-MAY-18 17:20:00 (CST-6)
Location: MARTINSVILLE
Magnitude: 52.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Three semis were blown over on I-70 northeast of Martinsville.