A large complex of thunderstorms over Illinois gradually evolved into a bowing line of storms as it approached southwest Indiana. Pockets of damaging winds and a 25-mile long microburst accompanied the line of storms across southwest Indiana. The storms increased in intensity as a result of strong heating and destabilization during the late morning hours. Localized areas of training and repeat cell development occurred in the vicinity of a surface warm front ahead of the complex, contributing to isolated flash flooding. This round of storms was followed by another round of severe weather during the late afternoon and evening hours.

Thunderstorm Wind in POSEY, INDIANA
From 26-JUN-18 09:04:00 to 26-JUN-18 09:19:00 (CST-6)
Location: GRIFFIN
Magnitude: 65.00 EG
Property damage: 275.00K
Reported by: NWS Storm Survey

A microburst produced a long swath of damaging winds across far northern Posey County. The swath was as much as two miles wide in places. Several corn fields were blown down, with the stalks broken in some areas. Hundreds of trees were broken or uprooted, and several power lines were down. Widespread tree damage occurred along Interstate 64 near the Black River rest area. Some small sheds and signs were damaged. The 25-mile long microburst continued across southern Gibson County, where it became more intense and damaging.

Thunderstorm Wind in POSEY, INDIANA
From 26-JUN-18 09:05:00 to 26-JUN-18 09:05:00 (CST-6)
Location: MT VERNON
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and power lines were down. Isolated power outages were reported.

Thunderstorm Wind in GIBSON, INDIANA
From 26-JUN-18 09:20:00 to 26-JUN-18 09:35:00 (CST-6)
Location: MOUNTS
Magnitude: 78.00 EG
Property damage: 350.00K
Reported by: NWS Storm Survey

A microburst produced a long swath of damaging winds through much of southern Gibson County. The swath was as much as two miles wide in places. The damage was most intense and frequent in and near Fort Branch, where at least ten homes sustained mainly minor damage, with loss of shingles and other exterior covering. At least two barns were heavily damaged in the Fort Branch area. Several corn fields were blown down, with the stalks broken in some areas. Hundreds of trees were broken or uprooted, and several power lines were down. Numerous small sheds, signs, and other outbuildings were damaged. A semi truck was blown over on the south side of Fort Branch. The 25-mile long microburst began in northwest Posey County, then moved  across southern Gibson County, where it became more intense and damaging.

Thunderstorm Wind in VANDERBURGH, INDIANA
From 26-JUN-18 09:38:00 to 26-JUN-18 09:43:00 (CST-6)
Location: EVANSVILLE
Magnitude: 52.00 MG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters measured winds up to 60 mph in the Evansville metro area. Tree limbs were down, and power outages were reported on the north-northwest side of town.

Thunderstorm Wind in PIKE, INDIANA
From 26-JUN-18 10:52:00 to 26-JUN-18 11:05:00 (EST-5)
Location: WINSLOW
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees and power lines were down in Winslow and Otwell.

Flash Flood in PIKE, INDIANA
From 26-JUN-18 11:35:00 to 26-JUN-18 12:45:00 (EST-5)
Location: WINSLOW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash flooding was reported along Highway 61 near the intersection of Highway 56. Water was over roadways in different locations.

Flash Flood in GIBSON, INDIANA
From 26-JUN-18 11:03:00 to 26-JUN-18 11:30:00 (CST-6)
Location: DOUGLAS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash flooding was reported along a county road on the north side of Princeton. Water was over Highway 64 east of Princeton.