An anomalously strong ridge centered across the Southeast brought record heat to the Upper Ohio Valley with the area in a zonal flow on the northern edge of the ridge. A weak frontal boundary extended from northern Indiana into western Pennsylvania.  Abundant moisture (1.75-2.00 PWAT), strong instability (SBCAPE 4000-5000 J/kg), moderate shear (40kts 0-6km), and a short wave just south of the boundary provided the ingredients for a long-tracked mesoscale convective system, classified by the Storm Prediction Center as a derecho, to track all the way from northern Indiana across eastern Ohio, southwestern Pennsylvania, northern WV, and western Maryland. As the MCS crossed the area, widespread wind damage was reported across areas primarily south and west of Pittsburgh. There were several reports of structural damage and damage led to a fatality when a barn collapsed in Muskingum county. Power outages were widespread with up to 130,000 outages reported immediately after the storms passage, most of which, were in Ohio. Muskingum and Guernsey counties sustained $712,000 and $500,000 in damages respectively. This also became on of the the costliest disasters to hit Ohio, right behind Hurricane Ike in 2008.

Thunderstorm Wind in TUSCARAWAS, OHIO
From 29-JUN-12 17:15:00 to 29-JUN-12 17:15:00 (EST-5)
Location: NEWCOMERSTOWN
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

State official reported numerous trees down.

Thunderstorm Wind in GUERNSEY, OHIO
From 29-JUN-12 17:20:00 to 29-JUN-12 17:20:00 (EST-5)
Location: CAMBRIDGE
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported large branches down.

Thunderstorm Wind in GUERNSEY, OHIO
From 29-JUN-12 17:25:00 to 29-JUN-12 17:25:00 (EST-5)
Location: CAMBRIDGE
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported that trees were ripped in half in Cambridge.

Hail in GUERNSEY, OHIO
From 29-JUN-12 17:06:00 to 29-JUN-12 17:06:00 (EST-5)
Location: CAMBRIDGE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GUERNSEY, OHIO
From 29-JUN-12 17:15:00 to 29-JUN-12 17:15:00 (EST-5)
Location: SALESVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JEFFERSON, OHIO
From 29-JUN-12 17:19:00 to 29-JUN-12 17:19:00 (EST-5)
Location: SMITHFIELD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GUERNSEY, OHIO
From 29-JUN-12 17:30:00 to 29-JUN-12 17:30:00 (EST-5)
Location: OLD WASHINGTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in MONROE, OHIO
From 29-JUN-12 17:30:00 to 29-JUN-12 17:30:00 (EST-5)
Location: WOODSFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MUSKINGUM, OHIO
From 29-JUN-12 16:50:00 to 29-JUN-12 16:50:00 (EST-5)
Location: GAYSPORT
Magnitude: 60.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported multiple trees down. A roof was also blown off and a garage destroyed.

Thunderstorm Wind in GUERNSEY, OHIO
From 29-JUN-12 17:26:00 to 29-JUN-12 17:26:00 (EST-5)
Location: SENECAVILLE
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported multiple trees down near Senecaville.

Thunderstorm Wind in GUERNSEY, OHIO
From 29-JUN-12 17:14:00 to 29-JUN-12 17:14:00 (EST-5)
Location: BIRDS RUN
Magnitude: 92.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Estimated by an Acu-rite winds sensor mounted to PVC piping. The sensor eventually became dislodged and blew away.

Flash Flood in JEFFERSON, OHIO
From 29-JUN-12 19:45:00 to 29-JUN-12 21:45:00 (EST-5)
Location: DILLONVALE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Call center employee received reports of flooded roadways in Dillonvale.

Thunderstorm Wind in HARRISON, OHIO
From 29-JUN-12 17:29:00 to 29-JUN-12 17:29:00 (EST-5)
Location: FREEPORT
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

The public reported trees down.

Thunderstorm Wind in GUERNSEY, OHIO
From 29-JUN-12 17:30:00 to 29-JUN-12 17:30:00 (EST-5)
Location: OLD WASHINGTON
Magnitude: 60.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Emergency personnel reported numerous damage to structures and trees down.

Thunderstorm Wind in MUSKINGUM, OHIO
From 29-JUN-12 16:53:00 to 29-JUN-12 16:53:00 (EST-5)
Location: (ZZV)ZANESVILLE MUNI
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in JEFFERSON, OHIO
From 29-JUN-12 18:00:00 to 29-JUN-12 18:00:00 (EST-5)
Location: STEUBENVILLE
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

The public reported large branches broken.

Thunderstorm Wind in COSHOCTON, OHIO
From 29-JUN-12 16:57:00 to 29-JUN-12 16:57:00 (EST-5)
Location: COSHOCTON
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported multiple trees down.

Thunderstorm Wind in BELMONT, OHIO
From 29-JUN-12 17:58:00 to 29-JUN-12 17:58:00 (EST-5)
Location: BETHESDA
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported trees down and roof damage.

Thunderstorm Wind in COSHOCTON, OHIO
From 29-JUN-12 17:00:00 to 29-JUN-12 17:00:00 (EST-5)
Location: COSHOCTON
Magnitude: 60.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported multiple trees down, power outages, and structural damage.

Thunderstorm Wind in JEFFERSON, OHIO
From 29-JUN-12 18:20:00 to 29-JUN-12 18:20:00 (EST-5)
Location: BRILLIANT
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

State official reported numerous trees blown down.

Thunderstorm Wind in MUSKINGUM, OHIO
From 29-JUN-12 17:00:00 to 29-JUN-12 17:00:00 (EST-5)
Location: SPANGLER
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported trees down.

Thunderstorm Wind in MUSKINGUM, OHIO
From 29-JUN-12 17:00:00 to 29-JUN-12 17:00:00 (EST-5)
Location: NORWICH
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported multiple trees down.

Thunderstorm Wind in JEFFERSON, OHIO
From 29-JUN-12 18:20:00 to 29-JUN-12 18:20:00 (EST-5)
Location: TILTONSVILLE
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

State official reported numerous trees blown down.

Thunderstorm Wind in MUSKINGUM, OHIO
From 29-JUN-12 17:00:00 to 29-JUN-12 17:00:00 (EST-5)
Location: NEW CONCORD
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported large trees blown down.

Thunderstorm Wind in COSHOCTON, OHIO
From 29-JUN-12 17:10:00 to 29-JUN-12 17:10:00 (EST-5)
Location: WEST LAFAYETTE
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported numerous trees down and power outages.

Thunderstorm Wind in JEFFERSON, OHIO
From 29-JUN-12 18:20:00 to 29-JUN-12 18:20:00 (EST-5)
Location: MT PLEASANT
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

State official reported numerous trees blown down.

Thunderstorm Wind in GUERNSEY, OHIO
From 29-JUN-12 17:00:00 to 29-JUN-12 17:00:00 (EST-5)
Location: CAMBRIDGE
Magnitude: 78.00 EG
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported damage to the clock tower of an 150 year old courthouse, the collapse of a church, and several other structures damaged in the city of Cambridge.

Thunderstorm Wind in GUERNSEY, OHIO
From 29-JUN-12 17:10:00 to 29-JUN-12 17:10:00 (EST-5)
Location: CAMBRIDGE
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

State official reported numerous trees down.

Thunderstorm Wind in MUSKINGUM, OHIO
From 29-JUN-12 17:00:00 to 29-JUN-12 17:00:00 (EST-5)
Location: (ZZV)ZANESVILLE MUNI
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in MUSKINGUM, OHIO
From 29-JUN-12 17:00:00 to 29-JUN-12 17:00:00 (EST-5)
Location: FREELAND
Magnitude: 60.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Newspaper

One woman was killed and another man injured when the barn they were in collapsed due to the straight line winds. They were checking on their animals when the barn collapsed. The man was able to escape. The woman was not.

Thunderstorm Wind in GUERNSEY, OHIO
From 29-JUN-12 17:15:00 to 29-JUN-12 17:15:00 (EST-5)
Location: SALESVILLE
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported trees down.

Thunderstorm Wind in GUERNSEY, OHIO
From 29-JUN-12 17:15:00 to 29-JUN-12 17:15:00 (EST-5)
Location: STOP
Magnitude: 60.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported the roof blown off of a house.

Thunderstorm Wind in MUSKINGUM, OHIO
From 29-JUN-12 16:45:00 to 29-JUN-12 16:45:00 (EST-5)
Location: ZANESVILLE
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported multiple trees down. Report relayed from the NWS in Wilmington OH.

Thunderstorm Wind in NOBLE, OHIO
From 29-JUN-12 17:15:00 to 29-JUN-12 17:15:00 (EST-5)
Location: HIRAMSBURG
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported numerous 80-foot pine trees snapped off at around 35-40 feet.