Damage Survey of June 4 Storms over Northwest IN - updated with maps

 

 A National Weather Service meteorologist performed an aerial survey of storm damage over northwest Indiana with the Lake County Sheriff’s Department Sunday.  All indications from the survey are that the damage was caused by straight-line winds. Winds were estimated to be up to around 110 mph, which is EF1 on the Enhanced Fujita damage scale.  

Damage was spread out across a path approximately 2 miles wide. All trees and debris appeared to be blown down in the same direction – towards the southeast. There was no evidence of convergence or rotation and no swirling pattern seen in open farm fields. These are all indications of straight-line winds rather than tornado.

 

There was sporadic, mostly light damage to trees and fences from Dyer to St. John. Damage became more intense and more widespread from St. John on the southwest and south sides of Crown Point. There was severe tree damage near the Lake County Fairgrounds and St. Anthony Medical Center. Trees and tree limbs were down, some on homes and roads.  Damage continued through rural Lake County southeast of Crown Point. Along I-65 from near 153rd Avenue to Route 2, signs were blown down. Near 173rd Avenue and I-65 a weigh station had its north facing bay doors blown in. The wind then lifted a section of the roof and blew out the doors on the south end of the building.  At Route 2, just east of I-65, a semi truck and trailer were overturned.

 

The most intense damage occurred from just east of I-65 and Route 2 southeastward toward the Kankakee River, and into far northern Jasper County. Hundreds of large trees were snapped or uprooted. Some detached garages, farm outbuildings and grain bins were destroyed or severely damaged. Homes suffered some loss of shingles. This damage is consistent with winds of 90 to 110 mph. There were 5 metal tress electrical towers collapsed. Although the EF guide would suggest stronger winds may be required to collapse the towers, none of the other nearby observed damage was consistent with wind speeds higher than around 110 mph.

 

South of the Kankakee River, damage continued to near Demotte. East of Demotte damage became lighter and more sporadic near the Kankakee Valley Schools southeastward to just southwest of Wheatfield.

 

damage to weigh station on I-65 

Damage to weigh station on I-65 

 

garages and sheds destroyed 

Garages and sheds destroyed  

trees flattened

Trees flattened

map of storm damage

 



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