Supercell thunderstorms developed in the vicinity of a warm front draped along the I-74 corridor during the afternoon and early evening of May 26th.  The hardest hit area was northern Vermilion County...where powerful cells produced a tornado, damaging winds, and extremely large hail.  An EF-1 tornado touched down northwest of Alvin, damaging trees, the roof and siding of a house, and a garage.  Meanwhile, 80-90mph winds produced nearly $3 million worth of tree and property damage in Rossville.  Very large hail up to the size of tennis balls were reported in Rankin.  In addition, extreme rainfall rates caused flash flooding in Hoopeston.

Thunderstorm Wind in VERMILION, ILLINOIS
From 26-MAY-17 16:53:00 to 26-MAY-17 17:03:00 (CST-6)
Location: ROSSVILLE
Magnitude: 78.00 EG
Property damage: 2.80M
Crop damage: 0.00K
Reported by: Emergency Manager

Extensive tree damage occurred across Rossville due to wind gusts of 80-90mph.  Many homes and cars were damaged due to falling trees and tree branches.  Numerous power poles and power lines were blown down and a few street lights were broken.

Thunderstorm Wind in VERMILION, ILLINOIS
From 26-MAY-17 16:52:00 to 26-MAY-17 16:57:00 (CST-6)
Location: ROSSVILLE JCT
Magnitude: 70.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees were snapped near Illinois Route 1 south of 3200 N Road.

Thunderstorm Wind in VERMILION, ILLINOIS
From 26-MAY-17 16:54:00 to 26-MAY-17 16:59:00 (CST-6)
Location: ROSSVILLE
Magnitude: 70.00 EG
Property damage: 45.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A pole barn was destroyed, with its roof and walls being blown about 300 yards to the southwest into a field.  A tree was snapped in half.

Thunderstorm Wind in VERMILION, ILLINOIS
From 26-MAY-17 17:00:00 to 26-MAY-17 17:05:00 (CST-6)
Location: ROSSVILLE
Magnitude: 70.00 EG
Property damage: 65.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A farmstead had an outbuilding destroyed and several trees damaged.

Thunderstorm Wind in VERMILION, ILLINOIS
From 26-MAY-17 17:15:00 to 26-MAY-17 17:20:00 (CST-6)
Location: BISMARCK
Magnitude: 70.00 EG
Property damage: 600.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees, power poles, and power lines were blown down.

Thunderstorm Wind in VERMILION, ILLINOIS
From 26-MAY-17 17:00:00 to 26-MAY-17 17:05:00 (CST-6)
Location: ROSSVILLE
Magnitude: 70.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A farmstead had an outbuilding destroyed and several trees damaged.

Lightning in PEORIA, ILLINOIS
From 26-MAY-17 13:15:00 to 26-MAY-17 13:16:00 (CST-6)
Location: COUGHLIN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A thunderstorm triggered a lightning strike at an outdoor music festival near Chillicothe in northeast Peoria County. Two people were injured.

Flash Flood in VERMILION, ILLINOIS
From 26-MAY-17 18:00:00 to 27-MAY-17 04:00:00 (CST-6)
Location: RANKIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Intense rainfall of 2.00 to 3.00 inches in 30 to 60 minutes produced rapid flash flooding in northern Vermilion County. The flooding on roads from East Lynn to Hoopeston was intensified by hail drifts 1.5 to 3 feet deep. Severe street flooding was reported in Hoopeston with water up to 3 feet deep. Illinois Route 1 was impassable from near the Iroquois County line to 3 miles southwest of Hoopeston. The combination of additional rainfall during the late evening hours and slowly melting hail drifts kept flash flood conditions in place until the early morning hours of May 27th.

Hail in PEORIA, ILLINOIS
From 26-MAY-17 13:52:00 to 26-MAY-17 13:57:00 (CST-6)
Location: PEORIA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in VERMILION, ILLINOIS
From 26-MAY-17 16:53:00 to 26-MAY-17 16:54:00 (CST-6)
Location: ROSSVILLE JCT
Tornado F-scale: EF1
Property damage: 45.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tornado touched down at 5:53PM CDT 2.2 miles northwest of Alvin.  It tracked southeastward and quickly dissipated by 5:54PM CDT.  The tornado snapped a tree, did minor damage to the roof and siding of a house, broke an attic window, and blew the siding off a garage.

Hail in TAZEWELL, ILLINOIS
From 26-MAY-17 14:01:00 to 26-MAY-17 14:06:00 (CST-6)
Location: GROVELAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in FULTON, ILLINOIS
From 26-MAY-17 14:05:00 to 26-MAY-17 14:10:00 (CST-6)
Location: CANTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in TAZEWELL, ILLINOIS
From 26-MAY-17 14:08:00 to 26-MAY-17 14:13:00 (CST-6)
Location: MORTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in TAZEWELL, ILLINOIS
From 26-MAY-17 14:06:00 to 26-MAY-17 14:11:00 (CST-6)
Location: CLOVERDALE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in VERMILION, ILLINOIS
From 26-MAY-17 16:26:00 to 26-MAY-17 16:31:00 (CST-6)
Location: RANKIN
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in VERMILION, ILLINOIS
From 26-MAY-17 16:35:00 to 26-MAY-17 16:40:00 (CST-6)
Location: HOOPESTON
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in VERMILION, ILLINOIS
From 26-MAY-17 16:40:00 to 26-MAY-17 16:45:00 (CST-6)
Location: EAST LYNN
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in VERMILION, ILLINOIS
From 26-MAY-17 16:43:00 to 26-MAY-17 16:47:00 (CST-6)
Location: EAST LYNN
Magnitude: 2.00 
Property damage: 325.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail lasted for 4 minutes and broke windshields.

Hail in VERMILION, ILLINOIS
From 26-MAY-17 17:25:00 to 26-MAY-17 17:30:00 (CST-6)
Location: DANVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in VERMILION, ILLINOIS
From 26-MAY-17 16:58:00 to 26-MAY-17 17:03:00 (CST-6)
Location: ROSSVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in VERMILION, ILLINOIS
From 26-MAY-17 16:48:00 to 26-MAY-17 16:53:00 (CST-6)
Location: ROSSVILLE
Magnitude: 2.00 
Property damage: 65.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind-driven hail did extensive damage to the siding and roof of a house.

Hail in VERMILION, ILLINOIS
From 26-MAY-17 17:00:00 to 26-MAY-17 17:05:00 (CST-6)
Location: HOOPESTON
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail drifts of 1.5 to 3 feet deep due to flooding were reported west of Hoopeston.

Thunderstorm Wind in TAZEWELL, ILLINOIS
From 26-MAY-17 14:07:00 to 26-MAY-17 14:12:00 (CST-6)
Location: MORTON
Magnitude: 61.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and power lines were blown down on the north side of Morton north of I-74 from Lakeland Road eastward to Tennessee Avenue.