An unstable atmosphere was in place ahead of a strong cold front moving into the region from the west and a weak warm front located across northwestern Indiana. These features combined with a high shear environment enhanced development of thunderstorms across northern Illinois. The storms congealed into a QLCS which produced damaging winds, large hail and an isolated tornado.

Hail in STARKE, INDIANA
From 04-AUG-12 15:58:00 to 04-AUG-12 15:59:00 (CST-6)
Location: OBER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in GRANT, INDIANA
From 04-AUG-12 18:55:00 to 04-AUG-12 18:56:00 (EST-5)
Location: SHADY HILLS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LA PORTE, INDIANA
From 04-AUG-12 15:57:00 to 04-AUG-12 15:58:00 (CST-6)
Location: WANATAH
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported power lines down along US 421, near Wanatah.

Thunderstorm Wind in LA PORTE, INDIANA
From 04-AUG-12 16:10:00 to 04-AUG-12 16:11:00 (CST-6)
Location: LA PORTE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported two large trees were blown down.

Thunderstorm Wind in LA PORTE, INDIANA
From 04-AUG-12 16:50:00 to 04-AUG-12 16:51:00 (CST-6)
Location: SPRINGVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a small tree was blown down.

Thunderstorm Wind in MARSHALL, INDIANA
From 04-AUG-12 17:35:00 to 04-AUG-12 17:36:00 (EST-5)
Location: PLYMOUTH
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management officials reported trees down throughout the county, including across US 31, south of US 30.

Thunderstorm Wind in LA PORTE, INDIANA
From 04-AUG-12 16:20:00 to 04-AUG-12 16:21:00 (CST-6)
Location: ROLLING PRAIRIE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management officials reported trees and power lines down.

Thunderstorm Wind in ST. JOSEPH, INDIANA
From 04-AUG-12 17:43:00 to 04-AUG-12 17:44:00 (EST-5)
Location: GLENWOOD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported portions of a corn field were flattened by strong winds.

Thunderstorm Wind in ELKHART, INDIANA
From 04-AUG-12 17:48:00 to 04-AUG-12 17:49:00 (EST-5)
Location: ELKHART
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

The public reported large branches down near County Road 1.

Thunderstorm Wind in HUNTINGTON, INDIANA
From 04-AUG-12 18:45:00 to 04-AUG-12 18:46:00 (EST-5)
Location: ANDREWS
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management officials reported a tree was blown down near County Road 115 North and State Route 24.

Thunderstorm Wind in ST. JOSEPH, INDIANA
From 04-AUG-12 17:03:00 to 04-AUG-12 17:04:00 (EST-5)
Location: (SBN)MICHIANA ARPT S
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The automated weather observation system at the South Bend Regional Airport recorded a 66 mph wind gust.

Thunderstorm Wind in KOSCIUSKO, INDIANA
From 04-AUG-12 18:13:00 to 04-AUG-12 18:14:00 (EST-5)
Location: NORTH WEBSTER
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

NWS officials estimated wind gusts to 65 mph at the National Weather Service office, just north of North Webster.

Thunderstorm Wind in ST. JOSEPH, INDIANA
From 04-AUG-12 17:38:00 to 04-AUG-12 17:39:00 (EST-5)
Location: MISHAWAKA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

An off duty NWS employee estimated a wind gust to 60 mph.

Thunderstorm Wind in ELKHART, INDIANA
From 04-AUG-12 17:50:00 to 04-AUG-12 17:51:00 (EST-5)
Location: ELKHART
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated a wind gust to 65 mph.

Thunderstorm Wind in GRANT, INDIANA
From 04-AUG-12 18:57:00 to 04-AUG-12 18:58:00 (EST-5)
Location: JONESBORO
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

The public estimated wind gusts to 65 mph.

Thunderstorm Wind in ALLEN, INDIANA
From 04-AUG-12 19:00:00 to 04-AUG-12 19:01:00 (EST-5)
Location: BROOKSIDE ESTATES
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter recorded a 71 mph wind gust at the intersection of Maplecrest and Interstate 469.

Thunderstorm Wind in HUNTINGTON, INDIANA
From 04-AUG-12 18:52:00 to 04-AUG-12 18:53:00 (EST-5)
Location: HUNTINGTON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management officials reported trees and power lines down near Rangeline Road and County Road 500 North.

Thunderstorm Wind in WELLS, INDIANA
From 04-AUG-12 19:10:00 to 04-AUG-12 19:11:00 (EST-5)
Location: ROCKFORD
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement officials reported a large tree was blown down across the road near Rockford. In addition, large tree limbs were reported down on County Road 450 East and 100 North.

Thunderstorm Wind in JAY, INDIANA
From 04-AUG-12 19:29:00 to 04-AUG-12 19:30:00 (EST-5)
Location: PORTLAND
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement officials reported trees limbs and power lines down in Portland and Pennville.

Thunderstorm Wind in ADAMS, INDIANA
From 04-AUG-12 19:29:00 to 04-AUG-12 19:30:00 (EST-5)
Location: PREBLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported large tree branches down.

Thunderstorm Wind in HUNTINGTON, INDIANA
From 04-AUG-12 18:47:00 to 04-AUG-12 18:48:00 (EST-5)
Location: ANDREWS
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management officials reported a large tree was blown down on McKeever Road.

Thunderstorm Wind in HUNTINGTON, INDIANA
From 04-AUG-12 19:08:00 to 04-AUG-12 19:09:00 (EST-5)
Location: WARREN
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management officials reported a large tree was blown down near the intersection of Wayne and Second streets.

Hail in STARKE, INDIANA
From 04-AUG-12 15:38:00 to 04-AUG-12 15:39:00 (CST-6)
Location: BASS STATION
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LA PORTE, INDIANA
From 04-AUG-12 15:57:00 to 04-AUG-12 15:58:00 (CST-6)
Location: WANATAH
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in LA PORTE, INDIANA
From 04-AUG-12 16:20:00 to 04-AUG-12 16:22:00 (CST-6)
Location: ROLLING PRAIRIE
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management officials, in coordination with NWS officials, indicated an area of damage associated with a line of severe thunderstorms, was consistent with an EF1 tornado near Rolling Prairie. Damage was first noted near the intersection of State Route 2 and County Road 400 East, where a few trees fell onto power lines. As the circulation skipped along the ground, additional trees were blown down near the intersection of State Route 2 and County Road 450. The most substantial damage occurred at a residence of the along the 4600 block of Oak Knoll Road.  A south-east facing garage door failed, which allowed the winds to enter the garage and blow out the north wall of the garage (DI: MDWH, DOD: 3.)  The circulation also rolled and destroyed an un-anchored shed at the same residence. A barn was also destroyed northeast of this residence before the circulation lifted. The maximum width of the circulation was 20 yards. The maximum wind speed is estimated at between 85 and 90 mph.

Thunderstorm Wind in ST. JOSEPH, INDIANA
From 04-AUG-12 17:38:00 to 04-AUG-12 17:39:00 (EST-5)
Location: (SBN)MICHIANA ARPT S
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Local media estimated 60 to 70 mph wind gusts.

Thunderstorm Wind in KOSCIUSKO, INDIANA
From 04-AUG-12 18:01:00 to 04-AUG-12 18:02:00 (EST-5)
Location: WARSAW
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement officials reported numerous trees were blown down in Warsaw, Winona Lake and northern portions of the county.