Record heat over the mountainous counties helped form convection in a moist environment during the early afternoon.  Cells were slow moving.  New clusters of convection continued to form during the late afternoon into the evening hours on the periphery of earlier convection.
Some slow moving and small repetitive cells caused localized downpours.  Since the ground was initially relatively dry, only localized minor flash flooding occurred.  A few locations had wind damage and hail.  Electricity interruptions were most common in Kanawha and Roane Counties.
After a warm and muggy night, new rounds of convection formed over the mountains by midday into the early afternoon on the 14th.  This was ahead of a nearly stationary front in Ohio into Kentucky and Tennessee.

Hail in WYOMING, WEST VIRGINIA
From 13-MAY-14 16:30:00 to 13-MAY-14 16:30:00 (EST-5)
Location: PINEVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ROANE, WEST VIRGINIA
From 13-MAY-14 20:40:00 to 13-MAY-14 20:40:00 (EST-5)
Location: WALTON
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees fell onto power lines.

Thunderstorm Wind in MINGO, WEST VIRGINIA
From 13-MAY-14 18:00:00 to 13-MAY-14 18:00:00 (EST-5)
Location: GILBERT
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were blown down onto Route 52.

Thunderstorm Wind in ROANE, WEST VIRGINIA
From 13-MAY-14 21:00:00 to 13-MAY-14 21:00:00 (EST-5)
Location: SPENCER
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees fell onto power lines.

Flash Flood in MINGO, WEST VIRGINIA
From 13-MAY-14 19:45:00 to 13-MAY-14 21:00:00 (EST-5)
Location: WHARNCLIFFE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Downpours with maximum rains estimated at 2 inches in an hour caused minor flash flooding on small streams and runs in the central and eastern portion of the county.

Bens Creek and Spring Fork flooded and closed roads near Wharncliffe.  The lower reaches of Pigeion Creek and its runs flooded roads around Delbarton.
No structures were flooded.

Flash Flood in FAYETTE, WEST VIRGINIA
From 13-MAY-14 17:00:00 to 13-MAY-14 18:00:00 (EST-5)
Location: BROOKLYN
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Rain estimated at around 2 inches in an hour caused the small streams feeding into the New River to flood.  One example was Coal Run in Cunard.  Small private bridges and culverts saw minor damage.  Roads were flooded.

Thunderstorm Wind in KANAWHA, WEST VIRGINIA
From 13-MAY-14 20:15:00 to 13-MAY-14 20:15:00 (EST-5)
Location: CROSS LANES
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: NWS Employee

Large branches were blown down.

Flash Flood in BRAXTON, WEST VIRGINIA
From 13-MAY-14 19:10:00 to 13-MAY-14 20:00:00 (EST-5)
Location: MC NUTT
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Localized downpours over Grannys Creek from slow moving thunderstorm cells caused flooding along Route 4.  The road was closed with 2 feet of water.

Hail in KANAWHA, WEST VIRGINIA
From 13-MAY-14 20:35:00 to 13-MAY-14 20:35:00 (EST-5)
Location: PINCH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in KANAWHA, WEST VIRGINIA
From 13-MAY-14 20:30:00 to 13-MAY-14 20:30:00 (EST-5)
Location: ST ALBANS
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A few trees fell.  One fallen tree damaged a house.

Flash Flood in BARBOUR, WEST VIRGINIA
From 14-MAY-14 12:05:00 to 14-MAY-14 14:00:00 (EST-5)
Location: TALBOT
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A small cluster of showers and thunderstorms elongated north to south, moved north along the Route 250 corridor.  Minor flash flooding occurred.  Drainage and runoff issues in Belington caused a few evacuations.

Hail in HARRISON, WEST VIRGINIA
From 14-MAY-14 17:54:00 to 14-MAY-14 17:54:00 (EST-5)
Location: SALEM
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media