Extensive damage was sustained from two separate lines of thunderstorms on Monday, June 30th which was officially determined to be from two separate derecho events from Central Iowa east into Michigan and Ohio. Thunderstorms developed over Iowa during the early afternoon and organized into a forward-propagating quasi-linear convective system (QLCS) and tracked to southern Lake Michigan by early to mid evening. Meanwhile, a second complex of intense thunderstorms developed over central and eastern Iowa and also evolved into a QLCS, tracking across northern Illinois and northwest Indiana late in the evening into the overnight hours. Across northern Illinois and northwest Indiana, the first derecho event produced scattered straight-line wind damage, with gusts measured as high as 70 MPH. The second derecho produced far more extensive damage, with 80 to 90 MPH straight line winds and numerous tornadoes. Initial post-event surveys cataloged 18 tornadoes across northern Illinois and northwest Indiana, 17 of EF1 intensity and one of EF0 intensity. Of these 18 tornadoes, 14 were associated with a pair of large mesovortices that traveled along the Kankakee River Valley in Kankakee County, Illinois and Lake, Newton, and Jasper Counties in Indiana. Analysis of Google Earth satellite imagery gathered in spring of 2015 showed numerous additional areas of damage not documented in the original survey efforts. A thorough analysis of this imagery and synthesis with the original survey information led to a complete reanalysis of the Kankakee Valley tornadoes. Ultimately, 18 tornado tracks were identified alone in the Kankakee Valley, leading to a total of 22 tornadoes for northern Illinois and northwest Indiana. Of the 18 revised tornadoes, 16 of the paths were determined, in part, using satellite imagery. Further re-examination of the damage also led to a change in rating for several of the damage locations. Of the 18 reanalyzed Kankakee Valley tracks, two were rated EF2, 13 were rated EF1, and three were rated EF0. Additional details on this reanalysis, including the methods used, can be found in the Electronic Journal of Severe Storms Meteorology (Lyza et al. 2019

Tornado in LAKE, INDIANA
From 30-JUN-14 21:38:00 to 30-JUN-14 21:39:00 (CST-6)
Location: NORTH HAYDEN
Tornado F-scale: EF1
Property damage: 0
Crop damage: 0
Reported by: NWS Storm Survey

This short-lived tornado began just west of the Illinois-Indiana state line and crossed the state line into a grove of trees and ended near Calumet Ave. There were multiple large trees downed with this tornado. Maximum winds were estimated to 90 mph.

Tornado in LAKE, INDIANA
From 30-JUN-14 21:38:00 to 30-JUN-14 21:41:00 (CST-6)
Location: NORTH HAYDEN
Tornado F-scale: EF1
Property damage: 86.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado started slightly east of the Illinois-Indiana state line and crossed U.S. Highway 41 before ending just east of Austin St. There were multiple large hardwood trees snapped and uprooted because of this tornado, as well as roof damage to a barn. Maximum winds were estimated to be 100 mph.

Tornado in LAKE, INDIANA
From 30-JUN-14 21:39:00 to 30-JUN-14 21:42:00 (CST-6)
Location: BELSHAW
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down near the intersection of U.S. Highway 41 and Belshaw Rd and tracked due east ending near Colfax Rd. Damage was done primarily to trees. Maximum winds were estimated to 110 mph.

Tornado in LAKE, INDIANA
From 30-JUN-14 21:42:00 to 30-JUN-14 21:43:00 (CST-6)
Location: LOWELL
Tornado F-scale: EF1
Property damage: 28.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado started near Cline Avenue southwest of the community of Lowell and ended near W. 197th Rd. Numerous trees were snapped and uprooted. Maximum winds were estimated to 100 mph.

Tornado in LAKE, INDIANA
From 30-JUN-14 21:44:00 to 30-JUN-14 21:46:00 (CST-6)
Location: LOWELL
Tornado F-scale: EF2
Property damage: 250.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This strong tornado touched down near the intersection of Clark St and Belshaw Rd and ended slightly east of Harrison St. Outbuildings as well as two large grain bins were destroyed, and numerous large high-tension wood power poles were snapped. There was also numerous trees snapped and uprooted along with crop damage. Maximum winds were estimated to 115 mph.

Tornado in LAKE, INDIANA
From 30-JUN-14 21:46:00 to 30-JUN-14 21:47:00 (CST-6)
Location: ORCHARD GROVE
Tornado F-scale: EF1
Property damage: 25.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado began over a farmstead along Grant St and tracked due east ending near Mississippi St. A large barn was destroyed with the top half of the barn ripped off and the bottom half severely damage. Numerous trees were snapped and uprooted. Maximum winds were estimated to 105 mph.

Thunderstorm Wind in LAKE, INDIANA
From 30-JUN-14 18:38:00 to 30-JUN-14 18:38:00 (CST-6)
Location: MUNSTER
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A light pole was blown down across Ridge Road near Columbia Avenue.  Trees to eight inches in diameter were blown down near Calumet Avenue and Ridge Road.  A 24-inch diameter tree was split in half.

Thunderstorm Wind in PORTER, INDIANA
From 30-JUN-14 19:11:00 to 30-JUN-14 19:11:00 (CST-6)
Location: CHESTERTON
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LAKE, INDIANA
From 30-JUN-14 18:45:00 to 30-JUN-14 18:45:00 (CST-6)
Location: CALUMET CITY
Magnitude: 55.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tree was blown onto a house on the 6400 block of Van Buren Avenue.

Thunderstorm Wind in LAKE, INDIANA
From 30-JUN-14 21:36:00 to 30-JUN-14 21:36:00 (CST-6)
Location: MUNSTER
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Numerous large trees were blown down.

Thunderstorm Wind in LAKE, INDIANA
From 30-JUN-14 21:41:00 to 30-JUN-14 21:47:00 (CST-6)
Location: SCHNEIDER
Magnitude: 65.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A semi truck was blown off Highway 41 near Schneider.  Trees and limbs were blown down in Schneider, including some that fell onto cars.  A roof was blown off of a house in Shelby.

Thunderstorm Wind in LAKE, INDIANA
From 30-JUN-14 21:43:00 to 30-JUN-14 21:43:00 (CST-6)
Location: CROWN POINT
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple large trees were uprooted along with large branches and power lines that were blown down.

Thunderstorm Wind in LAKE, INDIANA
From 30-JUN-14 21:38:00 to 30-JUN-14 21:46:00 (CST-6)
Location: LOWELL
Magnitude: 78.00 EG
Property damage: 5.00K
Crop damage: 25.00K
Reported by: NWS Storm Survey

Evidence of significant straight line winds up to 90 mph included seven snapped power poles and an approximately mile wide swath of corn crop that was completely flattened and trees snapped.  In Lowell, a trained spotter measured 63 mph wind gusts while a mesonet site measured 86 mph wind gusts.

Tornado in LAKE, INDIANA
From 30-JUN-14 21:42:00 to 30-JUN-14 21:46:00 (CST-6)
Location: SCHNEIDER
Tornado F-scale: EF1
Property damage: 60.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado started near Colfax St. and tracked through the south side of Shelby, through DeMotte, and ended slightly east of N. 600W Rd. A large barn was completely destroyed, and damage was done to houses in both Shelby and DeMotte. In addition, numerous hardwood trees were snapped and uprooted. Maximum winds were estimated to 110 mph.

Thunderstorm Wind in LAKE, INDIANA
From 30-JUN-14 21:47:00 to 30-JUN-14 21:47:00 (CST-6)
Location: COLE ARPT
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Multiple large trees were blown down.

Thunderstorm Wind in PORTER, INDIANA
From 30-JUN-14 21:51:00 to 30-JUN-14 21:52:00 (CST-6)
Location: PORTAGE
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Multiple large trees were blown down.

Thunderstorm Wind in PORTER, INDIANA
From 30-JUN-14 21:58:00 to 30-JUN-14 21:58:00 (CST-6)
Location: VALPARAISO
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees were blown down.

Tornado in LAKE, INDIANA
From 30-JUN-14 21:36:00 to 30-JUN-14 21:43:00 (CST-6)
Location: ILLINOI
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado began north of Momence along Illinois Highway 17, crossed the Illinois-Indiana state line and tracked near 241st Ave. in Indiana. The tornado then passed through the far south end of the town of Schneider and ended near the Kankakee River southwest of Shelby. Damage was done to a roof of a barn along with numerous hardwood trees snapped and uprooted. Maximum winds were estimated to 110 mph.

Tornado in JASPER, INDIANA
From 30-JUN-14 21:49:00 to 30-JUN-14 21:54:00 (CST-6)
Location: FOREST CITY
Tornado F-scale: EF1
Property damage: 60.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado started near Colfax St. and tracked through the south side of Shelby, through DeMotte, and ended slightly east of N. 600W Rd. A large barn was completely destroyed, and damage was done to houses in both Shelby and DeMotte. In addition, numerous hardwood trees were snapped and uprooted. Maximum winds were estimated to 110 mph.

Tornado in JASPER, INDIANA
From 30-JUN-14 21:56:00 to 30-JUN-14 21:57:00 (CST-6)
Location: KERSEY
Tornado F-scale: EF1
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado occurred northwest of Wheatfield tracking near W. 1450N Rd. Damage was done to a large pole barn with the roof blown off and multiple walls collapsed. There were also numerous trees snapped and uprooted. Maximum winds were estimated to 105 mph.

Tornado in NEWTON, INDIANA
From 30-JUN-14 21:46:00 to 30-JUN-14 21:49:00 (CST-6)
Location: THAYER
Tornado F-scale: EF1
Property damage: 60.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado started near Colfax St. and tracked through the south side of Shelby, through DeMotte, and ended slightly east of N. 600W Rd. A large barn was completely destroyed, and damage was done to houses in both Shelby and DeMotte. In addition, numerous hardwood trees were snapped and uprooted. Maximum winds were estimated to 110 mph.

Tornado in LAKE, INDIANA
From 30-JUN-14 21:36:00 to 30-JUN-14 21:44:00 (CST-6)
Location: NORTH HAYDEN
Tornado F-scale: EF1
Property damage: 128.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado began near Kankakee County Highway 13 in Illinois and crossed into Indiana just south of E. 10500N Rd. A house under construction (but sealed) had an exterior wall of the garage blown out, part of a second story exterior wall blown in, and a portion of roof removed. A barn also had substantial roof damage along with numerous large trees snapped, uprooted, and partially stripped of their branches. The tornado dissipated south of Lowell, Indiana near Colfax St. Maximum winds were estimated to 110 mph.

Thunderstorm Wind in LAKE, INDIANA
From 30-JUN-14 21:52:00 to 30-JUN-14 21:52:00 (CST-6)
Location: RANGE LINE
Magnitude: 87.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Hardwood and softwood trees were snapped and uprooted.  Shingles were ripped from a roof and there was damage to siding and downspouts.  There was a measured wind gust of 75 mph from a home weather station before electricity went out.