A pre-frontal trough ahead of an approaching cold front was  the focus for severe convection on the afternoon of August 3rd. Moderate CAPES and low-level moisture combined with increasing mid-level flow to produced numerous severe cells most of which produced wind damage.

Thunderstorm Wind in COOS, NEW HAMPSHIRE
From 03-AUG-15 16:40:00 to 03-AUG-15 16:44:00 (EST-5)
Location: COOS JCT
Magnitude: 65.00 EG
Crop damage: 0.00K
Reported by: NWS Storm Survey

Gusty winds from a severe thunderstorm toppled and snapped trees along the Connecticut River and caused a circus tent to collapse at the Lancaster Fairgrounds.  About 100 people were under the tent at the time it collapsed.  A 41-year-old man and his 6-year-old daughter were killed in the incident.  Another 32 people were reported to have been treated at nearby hospitals.  Winds were estimated to have gusted up to 75 mph in the hardest hit area along the Connecticut River where most of the tree damage occurred.  No structural damage occurred to any of the permanent buildings at the fairgrounds.

Thunderstorm Wind in SULLIVAN, NEW HAMPSHIRE
From 03-AUG-15 16:59:00 to 03-AUG-15 17:04:00 (EST-5)
Location: CORNISH CENTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm downed trees in Cornish.

Thunderstorm Wind in SULLIVAN, NEW HAMPSHIRE
From 03-AUG-15 16:30:00 to 03-AUG-15 16:35:00 (EST-5)
Location: CORNISH CENTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm downed trees in Cornish.

Thunderstorm Wind in COOS, NEW HAMPSHIRE
From 03-AUG-15 16:40:00 to 03-AUG-15 16:44:00 (EST-5)
Location: LANCASTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed numerous trees throughout Lancaster.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 03-AUG-15 16:30:00 to 03-AUG-15 16:34:00 (EST-5)
Location: LEBANON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed trees in Lebanon.

Hail in GRAFTON, NEW HAMPSHIRE
From 03-AUG-15 16:15:00 to 03-AUG-15 16:18:00 (EST-5)
Location: LITTLETON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm produced 1 inch hail in Littleton.

Hail in COOS, NEW HAMPSHIRE
From 03-AUG-15 17:35:00 to 03-AUG-15 17:40:00 (EST-5)
Location: UPPER KIDDERVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm produced 1 inch hail near Dixville.

Thunderstorm Wind in CHESHIRE, NEW HAMPSHIRE
From 03-AUG-15 17:00:00 to 03-AUG-15 17:05:00 (EST-5)
Location: GILSUM
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed a tree blocking Mack Road in Gilsum.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 03-AUG-15 17:10:00 to 03-AUG-15 17:15:00 (EST-5)
Location: RIVERSIDE ARPT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed numerous trees in Plymouth.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 03-AUG-15 17:10:00 to 03-AUG-15 17:15:00 (EST-5)
Location: BRISTOL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed numerous trees throughout Bristol.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 03-AUG-15 17:15:00 to 03-AUG-15 17:19:00 (EST-5)
Location: ASHLAND
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed numerous trees throughout Ashland.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 03-AUG-15 17:20:00 to 03-AUG-15 17:24:00 (EST-5)
Location: HOLDERNESS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed numerous trees throughout Holderness.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 03-AUG-15 17:30:00 to 03-AUG-15 17:34:00 (EST-5)
Location: WATERVILLE VLY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed trees and wires in Waterville Valley.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 03-AUG-15 17:00:00 to 03-AUG-15 17:04:00 (EST-5)
Location: LINCOLN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A  severe thunderstorm downed trees and wires in Lincoln.

Thunderstorm Wind in CARROLL, NEW HAMPSHIRE
From 03-AUG-15 18:08:00 to 03-AUG-15 18:12:00 (EST-5)
Location: EFFINGHAM FALLS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed trees on wires in Effingham Falls.

Thunderstorm Wind in CARROLL, NEW HAMPSHIRE
From 03-AUG-15 18:00:00 to 03-AUG-15 18:05:00 (EST-5)
Location: EAST CONWAY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed trees on wires at State Line Store in East Conway.

Thunderstorm Wind in CARROLL, NEW HAMPSHIRE
From 03-AUG-15 18:00:00 to 03-AUG-15 18:05:00 (EST-5)
Location: NORTH CONWAY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm downed numerous trees in North Conway.

Thunderstorm Wind in BELKNAP, NEW HAMPSHIRE
From 03-AUG-15 17:45:00 to 03-AUG-15 17:50:00 (EST-5)
Location: BELMONT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed a tree in Belmont.

Thunderstorm Wind in CARROLL, NEW HAMPSHIRE
From 03-AUG-15 17:40:00 to 03-AUG-15 17:45:00 (EST-5)
Location: WEST OSSIPEE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed trees and wires on Stevenson Drive in West Ossipee.

Thunderstorm Wind in CARROLL, NEW HAMPSHIRE
From 03-AUG-15 17:50:00 to 03-AUG-15 17:54:00 (EST-5)
Location: NORTH CONWAY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed numerous trees throughout North Conway.

Thunderstorm Wind in MERRIMACK, NEW HAMPSHIRE
From 03-AUG-15 19:35:00 to 03-AUG-15 19:40:00 (EST-5)
Location: ALLENSTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed trees in Allenstown.