Damaging winds were the primary type of severe weather as an extensive squall line crossed southwest Indiana. Thunderstorms were organized into bowing line segments that produced damaging winds as they moved rapidly east at 50 to 60 mph. The storms occurred along and ahead of a cold front that trailed south from a low pressure center near St. Louis. Isolated severe thunderstorm cells developed ahead of the quasi-linear convective system. Moderate instability existed ahead of the line of storms, with capes from 1500 to 2500 j/kg. Wind shear remained more than adequate for organization of the storms, with winds veering vertically in the lowest 3 km.

Thunderstorm Wind in VANDERBURGH, INDIANA
From 07-SEP-12 20:00:00 to 07-SEP-12 20:00:00 (CST-6)
Location: BELKNAP
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Substantial tree damage occurred in southwest parts of the county. Trees were down on power lines, causing numerous power outages.

Thunderstorm Wind in VANDERBURGH, INDIANA
From 07-SEP-12 19:58:00 to 07-SEP-12 19:58:00 (CST-6)
Location: NISBET
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Substantial tree damage occurred in northwest parts of the county. Trees were down on power lines, causing numerous power outages.

Heavy Rain in POSEY, INDIANA
From 07-SEP-12 19:15:00 to 07-SEP-12 20:17:00 (CST-6)
Location: POSEYVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Low-lying flooding was reported on main roads into Poseyville. A cocorahs observer a few miles northwest of Poseyville measured a storm total rainfall of 2.52 inches.

Heavy Rain in VANDERBURGH, INDIANA
From 07-SEP-12 20:10:00 to 07-SEP-12 20:30:00 (CST-6)
Location: DARMSTADT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter measured 1.25 inches of rain in 20 minutes.

Thunderstorm Wind in PIKE, INDIANA
From 07-SEP-12 20:50:00 to 07-SEP-12 20:50:00 (EST-5)
Location: PETERSBURG
Magnitude: 52.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several trees were blown down. Power outages were reported.

Heavy Rain in GIBSON, INDIANA
From 07-SEP-12 19:20:00 to 07-SEP-12 20:30:00 (CST-6)
Location: PRINCETON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter measured 2.10 inches of rain in an hour and ten minutes.

Thunderstorm Wind in VANDERBURGH, INDIANA
From 07-SEP-12 19:34:00 to 07-SEP-12 19:34:00 (CST-6)
Location: EVANSVILLE
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees were blown down in the south part of Evansville.

Thunderstorm Wind in POSEY, INDIANA
From 07-SEP-12 19:40:00 to 07-SEP-12 19:40:00 (CST-6)
Location: NEW HARMONY
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large tree limbs were down on power lines, causing power outages.

Thunderstorm Wind in POSEY, INDIANA
From 07-SEP-12 19:40:00 to 07-SEP-12 19:40:00 (CST-6)
Location: POSEYVILLE
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Minor roof damage occurred to three homes. Several trees were down on power lines, and power lines were down.

Thunderstorm Wind in GIBSON, INDIANA
From 07-SEP-12 20:03:00 to 07-SEP-12 20:03:00 (CST-6)
Location: FT BRANCH
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated wind gusts to 65 mph. Power outages were reported.

Thunderstorm Wind in VANDERBURGH, INDIANA
From 07-SEP-12 19:59:00 to 07-SEP-12 20:10:00 (CST-6)
Location: DARMSTADT
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Many trees were blown down in Darmstadt. A barn was blown into the road at Darmstadt. Power lines were blown down in and around the city of McCutchanville.

Thunderstorm Wind in WARRICK, INDIANA
From 07-SEP-12 20:19:00 to 07-SEP-12 20:19:00 (CST-6)
Location: BOONVILLE
Magnitude: 61.00 EG
Property damage: 9.00K
Crop damage: 0.00K
Reported by: State Official

A roof was partially blown off a car wash. Two trees were blown down.

Thunderstorm Wind in WARRICK, INDIANA
From 07-SEP-12 20:18:00 to 07-SEP-12 20:18:00 (CST-6)
Location: CHANDLER
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several small trees were blown down on Highway 62.

Thunderstorm Wind in VANDERBURGH, INDIANA
From 07-SEP-12 20:13:00 to 07-SEP-12 20:13:00 (CST-6)
Location: EVANSVILLE
Magnitude: 61.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts were estimated near 70 mph in downtown Evansville. Power outages were reported.

Thunderstorm Wind in SPENCER, INDIANA
From 07-SEP-12 20:40:00 to 07-SEP-12 20:40:00 (CST-6)
Location: ROCKPORT
Magnitude: 58.00 MG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree limbs were blown down, some of which were large. A wind gust was clocked at 67 mph.

Hail in POSEY, INDIANA
From 07-SEP-12 19:50:00 to 07-SEP-12 19:50:00 (CST-6)
Location: WADESVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter