Thunderstorm Wind in Tippecanoe County, Indiana

Two semis blown over by thunderstorm wind gusts on I-65.

During the 11th evening, a cold front interacted with a warm, moist, and unstable air mass across central and northern Indiana, initiating a fast-moving severe convective line. The synoptic setup supported widespread straight-line wind damage and embedded mesovortices as the squall line tracked eastward through the region between 7:59 PM EST and 10:32 PM EST.

Five tornadoes touched down across Warren, Carroll, Johnson, Shelby, and Randolph counties during the event. Four brief EF-0 tornadoes produced peak winds between 70 mph and 85 mph, causing tree damage and minor agricultural impacts. The most significant tornado was an EF-1 that tracked nearly 12 miles across Johnson and Shelby counties, generating peak winds of 105 mph that damaged several homes, outbuildings, and trees.

Widespread straight-line winds produced the majority of the severe impacts as the line moved across more than a dozen counties. Measured wind gusts frequently ranged from 59 mph to 67 mph, with localized straight-line winds estimated up to 95 mph in Howard County. Damage across the region included widespread downed trees and power lines, overturned commercial vehicles on major highways, and structural damage to roofs, barns, and outbuildings. This severe weather event would be the third of many for the month which would eventually define a formal disaster period from June 6th to the 18th which was declared by the governor of Indiana.