During the afternoon of the 26th, a low pressure system was organizing over the lower Ohio River.  Meanwhile, ahead of that system, a frontal boundary stretched east through southern Ohio and central West Virginia.
Thunderstorms formed along the frontal boundary in southern Ohio, with more widespread rain north of the front.  One of the leading storms was severe as it moved east.  Repetitive thunderstorms and showers affected Jackson, northern Gallia, and southern Meigs Counties for a few hours.  Downpours occurred.  An automatic gauge in Jackson measured 1.5 inches in less than an hour.  Its total by 2200E was 2.96 inches.  Flash flooding closed several roads, but damage to houses was minimal.
Other storms formed further south during the evening, affecting Lawrence County.

Flash Flood in JACKSON, OHIO
From 26-JUN-15 17:30:00 to 26-JUN-15 22:30:00 (EST-5)
Location: LEO
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Water blocked and closed several roads in the county.   Clay Banner Road was one example north of Oak Hill.

Flash Flood in MEIGS, OHIO
From 26-JUN-15 18:00:00 to 26-JUN-15 22:30:00 (EST-5)
Location: LONG BOTTOM
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Numerous roads were flooded and closed in the southern portion of the county.  This included portions of Route 143, 124, and 7.

Flash Flood in GALLIA, OHIO
From 26-JUN-15 18:15:00 to 26-JUN-15 22:30:00 (EST-5)
Location: VINTON
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Numerous roads were closed by flooding small streams in the northern portion of the county.  This included Route 160.

Thunderstorm Wind in JACKSON, OHIO
From 26-JUN-15 16:42:00 to 26-JUN-15 16:42:00 (EST-5)
Location: HITCHCOCK
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Numerous trees were blown down around Oak Hill.

Thunderstorm Wind in JACKSON, OHIO
From 26-JUN-15 16:34:00 to 26-JUN-15 16:34:00 (EST-5)
Location: JACKSON
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were blown down along Route 32.

Hail in JACKSON, OHIO
From 26-JUN-15 16:39:00 to 26-JUN-15 16:39:00 (EST-5)
Location: JACKSON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in GALLIA, OHIO
From 26-JUN-15 17:28:00 to 26-JUN-15 17:28:00 (EST-5)
Location: RIO GRANDE
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Many large tree branches blown down.  A 1 foot diameter tree was snapped.

Hail in LAWRENCE, OHIO
From 26-JUN-15 19:28:00 to 26-JUN-15 19:28:00 (EST-5)
Location: SOUTH PT
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Hail in LAWRENCE, OHIO
From 26-JUN-15 19:48:00 to 26-JUN-15 19:48:00 (EST-5)
Location: SOUTH PT
Magnitude: 1.25 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in LAWRENCE, OHIO
From 26-JUN-15 19:48:00 to 26-JUN-15 19:48:00 (EST-5)
Location: SOUTH PT
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Large branches were blown down.

Hail in LAWRENCE, OHIO
From 26-JUN-15 19:50:00 to 26-JUN-15 19:50:00 (EST-5)
Location: SOUTH PT
Magnitude: 1.25 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Half dollar size hail was bouncing off vehicles.

Hail in LAWRENCE, OHIO
From 26-JUN-15 19:50:00 to 26-JUN-15 19:50:00 (EST-5)
Location: CHESAPEAKE
Magnitude: 1.00 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Quarter size hail fell.