A mid and upper level disturbance dropped southeast during the morning.  Well south of any organized surface front, the air was moisture laden. This triggered rounds of showers and thunderstorms dropping from southeast Ohio into southern West Virginia during the early morning hours.  The ground was already wetter than normal.  The emerging spring vegetation had not become a major consumer of water.  The strongest thunderstorms did contain some hail, but small stream flooding was the main issue.
Repetitive showers and thunderstorms occurred from the Dingess area of Mingo County on east to the city of Logan in Logan County.  Lincoln County was also hit.  Rain amounts of 2 to 3 inches were common in about 4 hours during the morning.  For example, in downtown Logan, 2.69 inches of rain fell at the river gauge between 0700E and 1100E.  The heaviest hourly rate was 1.67 inches between 0800E and 0900E.  Another automatic gauge at the Logan airport had 2.66 inches in the same 4 hour time span.  An automatic gauge at the headwaters of Mud Fork, on the mountain ridge at Lomi, reported 2.2 inches of rain in over 6 hours.  A spotter in Chapmanville reported 2.5 inches of rain by 1200E. The Logan cooperative observer reported a 24 hour rain total of 4.17 inches, but hourly rates were not obtainable.
Small streams rose rapidly during the mid morning with flooding by late morning into the afternoon.  More showers fell during the afternoon, but these did not contribute much to severity of the flooding.  Most small streams crested in the early afternoon.
Another federal disaster was declared, mainly as a result of the damage along Mud Fork in western Logan County.  However, Lincoln and Mingo Counties were included in the disaster declaration.  In the aftermath, the peak deployment of West Virginia National Guard troops in Logan County was 167 in operations and 20 in support roles.  See FEMA disaster number 4061 for more details.

Hail in PUTNAM, WEST VIRGINIA
From 15-MAR-12 07:04:00 to 15-MAR-12 07:04:00 (EST-5)
Location: HURRICANE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PUTNAM, WEST VIRGINIA
From 15-MAR-12 07:01:00 to 15-MAR-12 07:01:00 (EST-5)
Location: WINFIELD
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail as large as golf balls fell.

Hail in LINCOLN, WEST VIRGINIA
From 15-MAR-12 07:03:00 to 15-MAR-12 07:03:00 (EST-5)
Location: HAMLIN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LINCOLN, WEST VIRGINIA
From 15-MAR-12 07:10:00 to 15-MAR-12 07:10:00 (EST-5)
Location: BRANCHLAND
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in LINCOLN, WEST VIRGINIA
From 15-MAR-12 10:15:00 to 15-MAR-12 17:30:00 (EST-5)
Location: HARTS
Flood cause: Heavy Rain
Property damage: 450.00K
Crop damage: 0.00K
Reported by: State Official

Streams such as Straight Fork and Big Harts Creek flooded.  Along the Straight Fork, debris piles from the flood earlier in the month were being washed away by this second flood.  Yawkey and the intersection of Route 214 and 3 were flooded again.  Students at Duval Elementary and Middle School remained at school until the water receded.  One resident near Yawkey said the water was about 4 inches lower than the previous flood.  One resident near Griffithsville had just replaced their carpet after being flooded on the 2nd.  He was flooded again.  Another resident said, I don't want to move.  I don't have the money or anything to move. I'm really confused and don't know what to do.
In Lincoln County, 3 homes had major damage, 9 others had minor damage.  Some of these same homes were damaged by flood water on March 2nd.

Flash Flood in MINGO, WEST VIRGINIA
From 15-MAR-12 09:50:00 to 15-MAR-12 17:30:00 (EST-5)
Location: BREEDEN
Flood cause: Heavy Rain
Property damage: 900.00K
Crop damage: 0.00K
Reported by: Department of Highways

The upper reaches, or headwaters, of Twelvepole Creek flooded, including around the Dingess area.  There was 1 home destroyed, 3 with major damage, and 6 with minor damage.  Private bridges across the small streams or runs were damaged creating access issues.

Hail in CABELL, WEST VIRGINIA
From 15-MAR-12 06:40:00 to 15-MAR-12 06:40:00 (EST-5)
Location: MILTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in LOGAN, WEST VIRGINIA
From 15-MAR-12 09:40:00 to 15-MAR-12 18:40:00 (EST-5)
Location: BIG CREEK
Flood cause: Heavy Rain
Property damage: 5.50M
Crop damage: 0.00K
Reported by: State Official

The worst flooding in terms of damage, was along the west to east flowing Mud Fork.  The Mud Fork basin drains through small communities such as Troy Town, Shegon, and Verdunville.  Around Mt Gay, the Mud Fork joins with the Copperas Mine Fork and Island Creek, before they empty into the Guyandotte River.  Smaller tributaries such as Coal Branch and Lower Dempsey Branch were also flooded.   Island Creek around Monaville was also flooded.   One resident along Mud Fork said, cars were going down the road like tic-tacs floating.   The children at the Verdunville Elementary School remained safe in the school until the water receded.
Ten homes were destroyed, 76 suffered major damage, and 133 homes had minor damage.  Around 400 families were eligible for federal assistance in Logan County.
The Allied Health Building that houses the Southern West Virginia Community and Technical College had about 18 inches of water on the first floor.  Many of the students vehicles in the parking lot were flooded.  The flood prone businesses in Mt Gay were flooded, but most had insurance.