On the second day of a developing heat wave, under a sunny sky, afternoon temperatures reached the upper 90s to above 100 degrees across most of southeast Ohio.  For example, Waterloo in Lawrence County reached 104 degrees that Friday afternoon.  Marietta had 100 degrees.  Meanwhile, an area of multi-cellular convection had moved out of northern Illinois that morning. It continued to organize and strengthen, as it propagated east and southeast across northern Indiana into western Ohio during the afternoon.  As it moved toward southeast Ohio, it had already formed into a large arch of storms, or bow, with a developing cool pool in its wake.  The temperature contrast between the air ahead of the developing derecho, compared to that in its wake was reaching 30 to 35 degrees. The resultant wind shift in the cool pool resulted in strong moisture convergence on the leading edge of the complex.  This in turn, helped drive the storms further southeast, away from the mid and upper level wind support.  However, the complex was diving right into that hot air that had obtained large convective available potential energy (CAPE), on the order of 4000 to 5000 j/kg.
The derecho reached southeast Ohio near the hottest time of the day, after 1600E.  It was racing southeast around 65 mph.  The outflow or gust front began to outrace the rain as it moved into southeast Ohio.  As the system matured, the strong gusts were longer in duration, in some cases around 10 minutes. That gust front then crossed the Ohio River into northeast Kentucky and western West Virginia on either side of 1730E.  The storms and showers only provided about a quarter to a half inch of rain.
Widespread wind gusts of 60 to 85 mph were likely with the leading gust front across southeast Ohio.  A department of highways garage in Perry County measured 62 mph at 1650E.  Ohio University at Athens measured 64 mph at 1712E.  The airport near Albany of Athens County had a gust to 59 mph at 1715E.  The department of highways garage in Gallia County near Kerr had 62 mph at 1731E.
The wind caused trees and large branches to fall in scattered locations throughout the 9 counties in southeast Ohio.  There was some structural damage.  Corrugated metal and siding were ripped off a few buildings.  Trees fell onto houses and vehicles.  Out of the 9 counties only 4 counties reported individual damage to the state.  Those counties were Athens, Jackson, Lawrence and Meigs.  The fallen trees and power lines also caused roads to be temporarily blocked.  However, the largest impact was on the electric power grid.  Prolonged power outages occurred.  Some areas were without electricity for 4 to 7 days.
Luckily there were no direct deaths or injuries.  One indirect death can be attributed to the storm.
The lack of electricity in the midst of the heat wave, disrupted the daily routines of most citizens for several days.  Water and ice were in high demand. An emergency declaration by President Obama allowed federal supplies to be quickly delivered.  Family and retail refrigerated food lost was substantial. Rural citizens with private wells may have been hit harder than those living in towns on public water systems.  Citizens that relied on well water had no power to pump the water from their wells.  Water had to be hauled just to flush the toilet. Some people slept outside on porches where it was cooler.  With limited gas stations available to pump gas, long lines developed for a few days in the wake of the storm.  Workers trying to restore the electricity had to take frequent breaks due to the heat and the safety equipment they had to wear.
Due to the public damage, a federal major disaster was eventually declared for this episode.  A few others episodes during the first few days of July were also included.  See FEMA disaster number 4077 for more details.

Thunderstorm Wind in MORGAN, OHIO
From 29-JUN-12 16:57:00 to 29-JUN-12 17:25:00 (EST-5)
Location: DEAVERTOWN
Magnitude: 52.00 EG
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Public

Several trees and large branches down in scattered locations about the county.  Nearly 6,000 customers lost electricity. The public infrastructure damage assessment was around $58,000.

Thunderstorm Wind in ATHENS, OHIO
From 29-JUN-12 17:15:00 to 29-JUN-12 17:15:00 (EST-5)
Location: ATHENS OHIO UNIV ARP
Magnitude: 51.00 MG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: AWOS

A gust to 59 mph was measured from a compass heading of 320 degrees.

Thunderstorm Wind in ATHENS, OHIO
From 29-JUN-12 17:12:00 to 29-JUN-12 17:12:00 (EST-5)
Location: ATHENS
Magnitude: 56.00 MG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Mesonet

A gust to 64 mph was measured.  The Ohio University campus lost 25 trees to the wind.  The trees damaged a baseball field fence and crushed one truck.

Thunderstorm Wind in ATHENS, OHIO
From 29-JUN-12 17:10:00 to 29-JUN-12 17:35:00 (EST-5)
Location: NELSONVILLE
Magnitude: 52.00 EG
Property damage: 2.50M
Crop damage: 0.00K
Reported by: State Official

Numerous trees or large branches fell across the county.  Nearly 24,000 customers lost electricity. Damage assessment included 1 home destroyed, 4 with major damage, and 3 with minor damage across the county.  The public infrastructure damage assessment was around $580,000.

Thunderstorm Wind in MEIGS, OHIO
From 29-JUN-12 17:30:00 to 29-JUN-12 17:30:00 (EST-5)
Location: SYRACUSE
Magnitude: 70.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Large trees were uprooted and mobile homes were knocked off their foundations.

Thunderstorm Wind in MEIGS, OHIO
From 29-JUN-12 17:40:00 to 29-JUN-12 17:40:00 (EST-5)
Location: RACINE
Magnitude: 61.00 EG
Property damage: 175.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The village building was damaged along with trees being blown down.

Thunderstorm Wind in MEIGS, OHIO
From 29-JUN-12 17:15:00 to 29-JUN-12 17:30:00 (EST-5)
Location: DYESVILLE
Magnitude: 61.00 EG
Property damage: 2.00M
Crop damage: 100.00K
Reported by: Emergency Manager

Scattered locations had trees blown down. Around 9,400 customers lost electricity. A total of 3 homes were destroyed, which included mobile homes.  Major damage was sustained by 28 homes.  Minor damage to roofs and porches occurred to 44 homes.  Six businesses had minor wind damage.  A lot of the damage in the county was concentrated in the villages along the river near Pomeroy.  Public buildings at the county fair grounds near Pomeroy were damaged.  Two barns were destroyed and 6 others had heavy damage.  The public infrastructure damage assessment was around $445,000.
Ten citizens were evacuated in Meigs County and 21 were sheltered, mainly because of the heat and no electricity during the aftermath.   Several cooling stations were open and free swimming was offered at the Syracuse pool.
About a third of the corn and tomato crops were destroyed.

Lightning in MEIGS, OHIO
From 29-JUN-12 17:20:00 to 29-JUN-12 17:20:00 (EST-5)
Location: RUTLAND
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

One business had major damage from a fire ignited by lightning.

Thunderstorm Wind in WASHINGTON, OHIO
From 29-JUN-12 17:30:00 to 29-JUN-12 17:30:00 (EST-5)
Location: MARIETTA
Magnitude: 56.00 EG
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees and large branches were blown down.  One massive tree fell onto a house along Montgomery Street.

Thunderstorm Wind in WASHINGTON, OHIO
From 29-JUN-12 17:30:00 to 29-JUN-12 17:30:00 (EST-5)
Location: LITTLE HOCKING
Magnitude: 56.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large trees were blown down.

Thunderstorm Wind in WASHINGTON, OHIO
From 29-JUN-12 17:20:00 to 29-JUN-12 17:20:00 (EST-5)
Location: BEVERLY
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Newspaper

The village office building was damaged.

Thunderstorm Wind in WASHINGTON, OHIO
From 29-JUN-12 17:20:00 to 29-JUN-12 17:35:00 (EST-5)
Location: BARTLETT
Magnitude: 56.00 EG
Property damage: 3.00M
Crop damage: 0.00K
Reported by: Newspaper

Scattered locations throughout the county had trees or large branches blown down. Nine of the 10 power substations in the county were in the dark.  Nearly 25,000 customers lost electricity. The public infrastructure damage assessment was around $975,000.

Thunderstorm Wind in VINTON, OHIO
From 29-JUN-12 16:55:00 to 29-JUN-12 17:15:00 (EST-5)
Location: EAGLE MILLS
Magnitude: 56.00 EG
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Newspaper

Scattered locations throughout the county had trees or large branches blown down.   Around 4,000 customers lost electricity. The county middle school was set up as a cooling center and a place to charge cellular phones.  Along with residences and businesses, the storm knocked out power and phone lines to the Vinton County Sheriff's Office, the McArthur Police Department, and emergency medical services.

Thunderstorm Wind in JACKSON, OHIO
From 29-JUN-12 17:10:00 to 29-JUN-12 17:25:00 (EST-5)
Location: JACKSON
Magnitude: 56.00 EG
Property damage: 1.50M
Crop damage: 0.00K
Reported by: Newspaper

Scattered locations throughout the county had large trees and branches blown down.  Around 8,000 customers lost electric power. Even a nursing home facility did not have power restored until 4 days after the storm.
Damage assessment across the county included 2 homes destroyed and 2 with major damage. The public infrastructure damage assessment was around $600.000.

Thunderstorm Wind in GALLIA, OHIO
From 29-JUN-12 17:31:00 to 29-JUN-12 17:31:00 (EST-5)
Location: KERR
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An Ohio Department of Transportation gauge, northwest of Gallipolis, measured a gust to 62 mph.

Thunderstorm Wind in GALLIA, OHIO
From 29-JUN-12 17:25:00 to 29-JUN-12 17:40:00 (EST-5)
Location: THURMAN
Magnitude: 56.00 EG
Property damage: 2.50M
Crop damage: 0.00K
Reported by: Newspaper

Scattered locations throughout the county had large trees and branches blown down.  The most concentrated damage in Gallipolis appeared along 4th Avenue.  Monuments were damaged in area cemeteries by fallen trees. Around 8,500 customers lost electricity. The public infrastructure damage assessment was around $639,000.

Thunderstorm Wind in LAWRENCE, OHIO
From 29-JUN-12 18:00:00 to 29-JUN-12 18:00:00 (EST-5)
Location: PROCTORVILLE
Magnitude: 52.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Public

Large trees and branches were blown down.  One single family house had shingles and a support structure blown off.

Thunderstorm Wind in LAWRENCE, OHIO
From 29-JUN-12 17:45:00 to 29-JUN-12 17:45:00 (EST-5)
Location: PEDRO
Magnitude: 52.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

One mobile homes was destroyed by the wind when its roof was removed.  Two other mobile homes had minor damage, with roof damage and leakage.

Thunderstorm Wind in LAWRENCE, OHIO
From 29-JUN-12 17:50:00 to 29-JUN-12 17:50:00 (EST-5)
Location: COAL GROVE
Magnitude: 52.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The storm caused a leaking ceiling to a single family house.  Sections of the ceiling collapsed.

Thunderstorm Wind in LAWRENCE, OHIO
From 29-JUN-12 17:35:00 to 29-JUN-12 18:00:00 (EST-5)
Location: BUCKHORN
Magnitude: 52.00 EG
Property damage: 1.50M
Crop damage: 0.00K
Reported by: Emergency Manager

Scattered locations throughout the county had large trees and branches blown down.  Around 13,400 customers lost electricity. The county engineer said the 911 center encountered a large volume of calls from people who were dependent on oxygen machines and were without electricity. He summarized the whole event by saying, we just had a bad evening.  Two overnight shelters were opened and supported by faith-based organizations for 4 days.  These were in Ironton and Chesapeake.  The South Point Volunteer Fire Department also provided shelter accommodations.
The public infrastructure damage assessment was around $239,000.

Thunderstorm Wind in LAWRENCE, OHIO
From 29-JUN-12 17:45:00 to 29-JUN-12 17:45:00 (EST-5)
Location: IRONTON
Magnitude: 52.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Newspaper

On South Third Street, a vacant building saw an entire wall of bricks blown out from its upper floor.  The bricks toppled to the sidewalk below.  One tree on Sixth Street fell onto a parked car.   Trash cans, potted plants, lawn furniture and other debris were blown around town.

Thunderstorm Wind in PERRY, OHIO
From 29-JUN-12 16:50:00 to 29-JUN-12 16:50:00 (EST-5)
Location: NEW LEXINGTON
Magnitude: 54.00 MG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Department of Highways

Numerous trees and large branches were blown down.

Thunderstorm Wind in PERRY, OHIO
From 29-JUN-12 16:35:00 to 29-JUN-12 17:10:00 (EST-5)
Location: THORNVILLE
Magnitude: 56.00 EG
Property damage: 1.00M
Crop damage: 0.00K
Reported by: State Official

Numerous large branches and trees fell across Perry County.  Over 10,000 customers lost electricity.  One shelter was set up in Crooksville High School in which 28 people stayed overnight.  Fire houses were used as cooling stations and also to feed citizens.  Some private stores gave away their foods before it would spoil.
Public damage which includes damages to roads and clearing debris was on the order of $600,000.  There was one indirect death to a 69 year old male that occurred in the Thornville vicinity.  He had health issues, but the lack of electricity in the aftermath of the storm contributed to his death.

Thunderstorm Wind in MORGAN, OHIO
From 29-JUN-12 17:07:00 to 29-JUN-12 17:07:00 (EST-5)
Location: MC CONNELSVILLE
Magnitude: 52.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Several trees or branches down around the community.

Thunderstorm Wind in LAWRENCE, OHIO
From 29-JUN-12 17:55:00 to 29-JUN-12 17:55:00 (EST-5)
Location: CHESAPEAKE
Magnitude: 52.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree fell through the roof of a single family house on 3rd Avenue.  The roof was crushed with damage to rafters and ceiling joists.