A cluster of severe thunderstorms moved southward across southwest Indiana. The storms produced a swath of wind and hail damage in a narrow corridor just to the east of a Princeton to Evansville line. The storms developed along and ahead of a cold front as it advanced south-southeast through central Illinois and central Indiana during the late afternoon. Temperatures reached the upper 90's to near 100 degrees ahead of the storms, resulting in a rather unstable air mass with mixed-layer capes up to 2500 j/kg. Moderately strong winds aloft supported multicell thunderstorms and an occasional supercell structure. Strong surface heating steepened low-level lapse rates, and low relative humidity near the ground enhanced the threat for strong downbursts.

Hail in GIBSON, INDIANA
From 31-JUL-12 17:24:00 to 31-JUL-12 17:27:00 (CST-6)
Location: OAKLAND CITY
Magnitude: 4.00 
Crop damage: 0.00K
Reported by: Law Enforcement

Baseball to grapefruit-size hail fell during a parade. Three people were injured by the hail and required treatment at a local hospital. There was major hail damage to many homes, primarily in Oakland City.

Thunderstorm Wind in GIBSON, INDIANA
From 31-JUL-12 17:15:00 to 31-JUL-12 17:30:00 (CST-6)
Location: OAKLAND CITY
Magnitude: 96.00 EG
Property damage: 6.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

A very destructive macroburst with winds estimated up to 110 mph snapped or uprooted thousands of trees. Hundreds of structures were damaged. A total of 78 structures received major damage such as loss of roof decking or porches, and 249 sustained minor damage such as loss of shingles or minor siding loss. Dozens of barns and sheds were heavily damaged or destroyed. The macroburst damage was concentrated in Oakland City. The damage area extended south to the Warrick County line. In Oakland City, a tree was down on a trailer with residents still inside. The damage path was 3.5 miles wide and 12 miles long. One person was injured due to wind, and three people were injured by hail. All of the injuries occurred in Oakland City, and all were treated at hospitals. Roads were blocked by debris, including State Route 57. Two miles south of Oakland City, part of a roof was on a roadway.

Hail in PIKE, INDIANA
From 31-JUL-12 18:12:00 to 31-JUL-12 18:12:00 (EST-5)
Location: PETERSBURG
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Small tree limbs were also blown down.

Hail in WARRICK, INDIANA
From 31-JUL-12 17:42:00 to 31-JUL-12 17:42:00 (CST-6)
Location: LYNNVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WARRICK, INDIANA
From 31-JUL-12 17:58:00 to 31-JUL-12 17:58:00 (CST-6)
Location: CHANDLER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in WARRICK, INDIANA
From 31-JUL-12 18:02:00 to 31-JUL-12 18:02:00 (CST-6)
Location: NEWBURGH
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were two reports of nickel-size hail.

Hail in WARRICK, INDIANA
From 31-JUL-12 18:04:00 to 31-JUL-12 18:04:00 (CST-6)
Location: NEWBURGH
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WARRICK, INDIANA
From 31-JUL-12 18:06:00 to 31-JUL-12 18:10:00 (CST-6)
Location: NEWBURGH
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter to golf ball size hail was reported. Some rotation was observed in the clouds.

Thunderstorm Wind in GIBSON, INDIANA
From 31-JUL-12 17:20:00 to 31-JUL-12 17:20:00 (CST-6)
Location: FRANCISCO
Magnitude: 70.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Siding was peeled off a house.

Thunderstorm Wind in WARRICK, INDIANA
From 31-JUL-12 18:10:00 to 31-JUL-12 18:10:00 (CST-6)
Location: NEWBURGH
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a healthy 10-inch diameter tree was blown down in a yard.

Thunderstorm Wind in WARRICK, INDIANA
From 31-JUL-12 17:35:00 to 31-JUL-12 17:35:00 (CST-6)
Location: LYNNVILLE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Three to five-inch diameter tree limbs were blown down.

Thunderstorm Wind in WARRICK, INDIANA
From 31-JUL-12 17:58:00 to 31-JUL-12 17:58:00 (CST-6)
Location: CHANDLER
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree limbs were blown down. Power was out at a few homes.