Severe storms developed along an approaching front on Monday, June 14th. Strong shear (60kts in the 0-6km layer), moderate instability (CAPE of 1000-1500 J/kg), and dry mid-level air helped produce strong downdrafts and hail.
An isolated supercell developed ahead of an advancing boundary and quickly spun up a tornado near Pleasant Valley, WV.

Hail in BROOKE, WEST VIRGINIA
From 14-JUN-21 14:07:00 to 14-JUN-21 14:07:00 (EST-5)
Location: COLLIERS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

One inch hail observed.

Hail in MONONGALIA, WEST VIRGINIA
From 14-JUN-21 17:40:00 to 14-JUN-21 17:40:00 (EST-5)
Location: GRANVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported quarter sized hail.

Hail in MONONGALIA, WEST VIRGINIA
From 14-JUN-21 17:46:00 to 14-JUN-21 17:46:00 (EST-5)
Location: FIELDCREST
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter sized hail reported by a spotter.

Hail in MONONGALIA, WEST VIRGINIA
From 14-JUN-21 17:48:00 to 14-JUN-21 17:48:00 (EST-5)
Location: FIELDCREST
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Hail in PRESTON, WEST VIRGINIA
From 14-JUN-21 18:12:00 to 14-JUN-21 18:12:00 (EST-5)
Location: ROWLESBURG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Thunderstorm Wind in MARSHALL, WEST VIRGINIA
From 14-JUN-21 16:46:00 to 14-JUN-21 16:46:00 (EST-5)
Location: KNOXVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a large branch and tree limbs down east of Moundsville.

Thunderstorm Wind in PRESTON, WEST VIRGINIA
From 14-JUN-21 16:48:00 to 14-JUN-21 16:48:00 (EST-5)
Location: BRUCETON MILLS
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A large number of trees reported down.

Thunderstorm Wind in MARION, WEST VIRGINIA
From 14-JUN-21 17:50:00 to 14-JUN-21 17:50:00 (EST-5)
Location: GASTON JCT
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Widespread tree damage in Fairmont.

Thunderstorm Wind in WETZEL, WEST VIRGINIA
From 14-JUN-21 17:52:00 to 14-JUN-21 17:52:00 (EST-5)
Location: FOLSOM
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Numerous trees and power lines down. Most of the town is without power.

Thunderstorm Wind in MARION, WEST VIRGINIA
From 14-JUN-21 17:56:00 to 14-JUN-21 17:56:00 (EST-5)
Location: BARRACKVILLE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Numerous trees down.

Thunderstorm Wind in TUCKER, WEST VIRGINIA
From 14-JUN-21 19:15:00 to 14-JUN-21 19:15:00 (EST-5)
Location: PORTERWOOD
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Tree across Route 72 north of Parsons.

Tornado in MARION, WEST VIRGINIA
From 14-JUN-21 17:42:00 to 14-JUN-21 17:46:00 (EST-5)
Location: COLFAX
Tornado F-scale: EF0
Reported by: NWS Storm Survey

Initial damage began just west of Interstate 79, and intensified
briefly after crossing the Interstate. The most concentrated
damage along the convergent debris path was found along Stoney
Road, where numerous trees were uprooted or snapped, and a well-
constructed garage lost shingles. A large tree in this area was
blown onto a house, where an inhabiatant sustained injuries. The
tornado continued along the valley and slowly weakened, continuing
to uproot trees.
Given the wet soil from prior rain, maximum wind speed was
estimated on the lower end of what would be consistent with the
nature and scope of the observed damage.