A strong cold front swept across the region during Wednesday afternoon and evening, June 1st. Atmospheric conditions were favorable for severe thunderstorms, including supercells with an explosive environment in place across the region. The thunderstorms had strong and persistent (sometimes rotating) updrafts.
Severe thunderstorms affected southern Vermont. Large and historic hail occurred with only a few strong wind reports. Hail sizes of greater than one inch in diameter were common, with reports of greater than baseball size hail, 3 inches, being reported in Shaftsbury in Bennington County.

Hail in BENNINGTON, VERMONT
From 01-JUN-11 12:55:00 to 01-JUN-11 13:00:00 (EST-5)
Location: EAST ARLINGTON
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Trained Spotter

Half dollar size hail was reported during a thunderstorm in Arlington.

Hail in WINDHAM, VERMONT
From 01-JUN-11 13:16:00 to 01-JUN-11 13:20:00 (EST-5)
Location: WEST DOVER
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Public

Multiple reports of 2 inch diameter size hail (measured) were reported during a thunderstorm in West Dover.

Hail in WINDHAM, VERMONT
From 01-JUN-11 13:28:00 to 01-JUN-11 13:31:00 (EST-5)
Location: EAST DOVER
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Post Office

Golf ball size hail was reported during a thunderstorm in East Dover.

Hail in BENNINGTON, VERMONT
From 01-JUN-11 13:48:00 to 01-JUN-11 13:52:00 (EST-5)
Location: SHAFTSBURY
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Public

Hail up to golf ball size was reported during a thunderstorm in Shaftsbury.

Hail in BENNINGTON, VERMONT
From 01-JUN-11 14:00:00 to 01-JUN-11 14:10:00 (EST-5)
Location: SHAFTSBURY
Magnitude: 3.25 
Crop damage: 0.00K
Reported by: Public

Multiple reports of large hail were reported during a thunderstorm in Shaftsbury. Hail stones of 3.25 inches and 2.75 inches in diameter were measured.

Hail in BENNINGTON, VERMONT
From 01-JUN-11 14:07:00 to 01-JUN-11 14:10:00 (EST-5)
Location: SHAFTSBURY
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel to quarter size hail (measured) was reported during a thunderstorm approximately 1 mile east of Shaftsbury. In addition, trees were reported down due to strong thunderstorm winds.

Thunderstorm Wind in BENNINGTON, VERMONT
From 01-JUN-11 14:07:00 to 01-JUN-11 14:07:00 (EST-5)
Location: SUNDERLAND
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Two trees were reported down in Sunderland due to strong thunderstorm winds.

Thunderstorm Wind in WINDHAM, VERMONT
From 01-JUN-11 16:40:00 to 01-JUN-11 16:40:00 (EST-5)
Location: EAST DUMMERSTON
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

A tree was reported down on Route 5 on the Putney/Brattleboro border due to strong thunderstorm winds.

Hail in WINDHAM, VERMONT
From 01-JUN-11 14:15:00 to 01-JUN-11 14:20:00 (EST-5)
Location: BRATTLEBORO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail was reported near Brattleboro during a thunderstorm.

Hail in WINDHAM, VERMONT
From 01-JUN-11 14:30:00 to 01-JUN-11 14:35:00 (EST-5)
Location: NEWFANE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Quarter to golf ball size hail was reported in Newfane, and approximately 1 mile southeast of Townshend. The golf ball size hail was measured at the Sherriff Department in Newfane.

Hail in BENNINGTON, VERMONT
From 01-JUN-11 14:55:00 to 01-JUN-11 15:00:00 (EST-5)
Location: BENNINGTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported near Bennington during a thunderstorm.

Hail in WINDHAM, VERMONT
From 01-JUN-11 15:15:00 to 01-JUN-11 15:20:00 (EST-5)
Location: MARLBORO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail was reported near Marlboro during a thunderstorm.

Hail in WINDHAM, VERMONT
From 01-JUN-11 16:15:00 to 01-JUN-11 16:20:00 (EST-5)
Location: WILMINGTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Quarter size hail was reported near Wilmington during a thunderstorm.

Hail in WINDHAM, VERMONT
From 01-JUN-11 16:40:00 to 01-JUN-11 16:45:00 (EST-5)
Location: BRATTLEBORO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Penny to quarter size hail was reported in Brattleboro during a thunderstorm.

Hail in WINDHAM, VERMONT
From 01-JUN-11 17:08:00 to 01-JUN-11 17:13:00 (EST-5)
Location: GUILFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Quarter size hail was reported near Guilford, in the vicinity of Fort Dummer State Park, during a thunderstorm.

Hail in WINDHAM, VERMONT
From 01-JUN-11 17:19:00 to 01-JUN-11 17:24:00 (EST-5)
Location: HALIFAX
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Half dollar size hail was reported near Halifax during a thunderstorm.