Multiple rounds of convection affected West Virginia from late Sunday afternoon on the 16th into Tuesday afternoon the 18th.
Initially, an easterly flow into the southern and central mountainous counties, helped trigger showers and thunderstorms late Sunday afternoon.  Rains of 2 to 3 inches fell around Beavers and Glen Morgan in Raleigh County, plus near Meadow Bridge in Fayette County, causing minor flash flooding.
On Monday the 17th, a strong mid level low was over Indiana with its surface reflection in Ohio.  The associated front moved into West Virginia during the afternoon.  Short lines of thunderstorms formed parallel to their movement.  Local downpours caused flash flooding when these short lines trained over the same creek basins.  Some large hail occurred in Wyoming County.
On Tuesday, as the mid level low crept closer, scattered thunderstorms did form during the afternoon.  Some minor flooding occurred during this final round of convection.

Flash Flood in KANAWHA, WEST VIRGINIA
From 17-MAY-10 16:32:00 to 17-MAY-10 18:30:00 (EST-5)
Location: SISSONVILLE
Flood cause: Heavy Rain
Property damage: 1.20M
Crop damage: 0.00K
Reported by: NWS Storm Survey

This area had received heavy rain 5 days earlier on the 12th.  Another round of showers fell on the 14th.  The ground was wetter than normal.  Rain estimates of 2 to 3 inches fell in an hour.
The most impact was along small tributaries to Rocky Fork, including Fishers Branch.  An unnamed tributary creek along Route 501 flooded backyards and around homes east of Cross Lanes.  Near the junction of Route 501 and 622, 2 homes were severely flooded on a private road called Valley Hill Drive. A private culvert could not handle the water.  The water could only flow around the culvert on one side.  The high water knocked down fences, went over the road and straight through 2 rental homes.  Water was several feet deep in those 2 homes.
Rocky Branch flooded sections of Route 622.  The headwaters of Martins Branch flooded a few homes, outbuildings and garages.  Numerous streams between Pocatalico and Sissonville flooded, including Legg Fork.  The Pocatalico Community Church had several feet of water in its basement.  Even Flinn Elementary School got a few inches of water inside the building.  The school is not near a stream.  The principal said, normally it's not even a possibility that we'll get flooded.  We weren't prepared for all of this water.  The downpour over the wet soils caused runoff to flow down an urbanized hillside.  A drain outside the school was clogged, allowing the water to come inside.

Hail in WYOMING, WEST VIRGINIA
From 17-MAY-10 14:35:00 to 17-MAY-10 14:35:00 (EST-5)
Location: BRENTON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in WOOD, WEST VIRGINIA
From 18-MAY-10 16:20:00 to 18-MAY-10 17:20:00 (EST-5)
Location: WILLIAMSTOWN
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Newspaper

Small streams, such as Little Pond Run, caused street flooding.  No dwellings were damaged.

Flash Flood in FAYETTE, WEST VIRGINIA
From 16-MAY-10 18:20:00 to 16-MAY-10 20:00:00 (EST-5)
Location: BELLWOOD
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Rain estimates of 2 to 3 inches of rain were indicated around Meadow Bridge.  Laurel Branch and Lively Branch flooded roads.  Evacuations were done as a precaution.  Sewell Creek also flooded around Bellwood.

Flash Flood in LOGAN, WEST VIRGINIA
From 17-MAY-10 18:30:00 to 17-MAY-10 19:30:00 (EST-5)
Location: ETHEL
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Another estimated southwest to northeast band of 2 to 3 inches of rain hit just east of the city of Logan.  Small streams flooded roads in the vicinity of McConnell and Lyburn.

Hail in WYOMING, WEST VIRGINIA
From 17-MAY-10 14:37:00 to 17-MAY-10 14:37:00 (EST-5)
Location: BRENTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in BOONE, WEST VIRGINIA
From 17-MAY-10 17:30:00 to 17-MAY-10 18:30:00 (EST-5)
Location: DARTMONT
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Small streams such as White Oak flooded roads.

Flash Flood in LINCOLN, WEST VIRGINIA
From 17-MAY-10 17:00:00 to 17-MAY-10 18:30:00 (EST-5)
Location: WOODVILLE
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Streams, such as Peters Cave Fork, Ely Fork, and the headwaters of Straight Fork, flooded roads, yards, and fields.  A few small private bridges were damaged.  One resident along Ely Fork said he had enough time to get the kids out of the house, move the truck and that was it.

Flash Flood in RALEIGH, WEST VIRGINIA
From 16-MAY-10 16:23:00 to 16-MAY-10 19:00:00 (EST-5)
Location: (BKW)RALEIGH CO ARPT
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Mariner

Roads in the Beaver and Glen Morgan vicinity were flooded by small streams.  Raleigh County dispatchers said 2 vehicles became stranded in the water in the Beaver area.  Basement flooding occurred, but no major damage was evident. The airport reported just over 2 inches of rain.

Flash Flood in LOGAN, WEST VIRGINIA
From 18-MAY-10 02:30:00 to 18-MAY-10 03:30:00 (EST-5)
Location: MC CONNELL
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

Small streams flooded yards and roads, including Route 10.