Strong convection developed on a pre-frontal trough ahead of an approaching cold front on the afternoon of June 18th. A deep layer of moderate to strong shear accompanied this boundary as it pushed in from the west. Moderate helicity values resulted in good rotation with some storms. Although two tornadoes were confirmed and other funnel clouds were reported, the majority of the storms produced straight line wind damage.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 18-JUN-18 14:38:00 to 18-JUN-18 14:43:00 (EST-5)
Location: WOODSTOCK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed trees and wires on Route 112 in Woodstock.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 18-JUN-18 15:03:00 to 18-JUN-18 15:08:00 (EST-5)
Location: BATH
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed trees and wires in Bath.

Thunderstorm Wind in CARROLL, NEW HAMPSHIRE
From 18-JUN-18 15:24:00 to 18-JUN-18 15:28:00 (EST-5)
Location: CONWAY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed a tree in Conway.

Thunderstorm Wind in CHESHIRE, NEW HAMPSHIRE
From 18-JUN-18 16:05:00 to 18-JUN-18 16:09:00 (EST-5)
Location: WESTMORELAND
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm downed multiple trees in Westmoreland.

Thunderstorm Wind in HILLSBOROUGH, NEW HAMPSHIRE
From 18-JUN-18 16:54:00 to 18-JUN-18 16:59:00 (EST-5)
Location: SHIRLEY HILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm downed multiple trees near Shirley Hill.

Thunderstorm Wind in MERRIMACK, NEW HAMPSHIRE
From 18-JUN-18 17:01:00 to 18-JUN-18 17:06:00 (EST-5)
Location: CONCORD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed trees and wires in Concord.

Thunderstorm Wind in MERRIMACK, NEW HAMPSHIRE
From 18-JUN-18 17:03:00 to 18-JUN-18 17:07:00 (EST-5)
Location: BOSCAWEN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed trees and wires in Boscawen.

Thunderstorm Wind in MERRIMACK, NEW HAMPSHIRE
From 18-JUN-18 17:10:00 to 18-JUN-18 17:15:00 (EST-5)
Location: ALLENSTOWN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed trees and wires in Allenstown.

Thunderstorm Wind in MERRIMACK, NEW HAMPSHIRE
From 18-JUN-18 17:12:00 to 18-JUN-18 17:17:00 (EST-5)
Location: LOUDON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed trees and wires in Loudon.

Thunderstorm Wind in ROCKINGHAM, NEW HAMPSHIRE
From 18-JUN-18 17:25:00 to 18-JUN-18 17:30:00 (EST-5)
Location: WESTVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed a large tree in Westville.

Tornado in GRAFTON, NEW HAMPSHIRE
From 18-JUN-18 14:32:00 to 18-JUN-18 14:33:00 (EST-5)
Location: LINCOLN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A hiker on Mt. Pemigewasset filmed a small tornado that touched down briefly in a remote wooded area about 3 miles northwest of the Town of Lincoln in Grafton County.  The video showed the small tornado in contact with the ground on the side of a nearby wooded hillside. Rapid rotation was noted in the cloud base.

Tornado in GRAFTON, NEW HAMPSHIRE
From 18-JUN-18 14:03:00 to 18-JUN-18 14:15:00 (EST-5)
Location: BATH
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An EF-0 tornado touched down near Bath in Grafton County and continued east-southeast for about 9.5 miles.  The tornado downed trees along the Ammonoosuc River near the Bath/Haverhill line.  The path of snapped, uprooted, and other downed trees continued to the east southeast, crossing Goose Lane Road and then paralleling State Route 112. The tornado passed very close to the Swiftwater Covered Bridge before continuing east southeast.  Tree damage was also noted northeast of the intersection of State Routes 112 and 116 in the Town of Easton, NH
Given the lack of structural damage and the nature of the tree damage, a rating of EF0 was assigned to this tornado.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 18-JUN-18 13:55:00 to 18-JUN-18 13:59:00 (EST-5)
Location: WOODSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed trees and wires in Woodsville.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 18-JUN-18 14:55:00 to 18-JUN-18 14:59:00 (EST-5)
Location: LOST RIVER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A severe thunderstorm downed multiple trees on Route 118 near Lost River.

Thunderstorm Wind in CHESHIRE, NEW HAMPSHIRE
From 18-JUN-18 16:15:00 to 18-JUN-18 16:20:00 (EST-5)
Location: (EEN)DILLANT FLD ARP
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm downed multiple trees on Mathews Road near Swanzey.

Thunderstorm Wind in HILLSBOROUGH, NEW HAMPSHIRE
From 18-JUN-18 16:40:00 to 18-JUN-18 16:44:00 (EST-5)
Location: GREENFIELD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm downed power lines on Gould Hill Road in Greenfield.

Thunderstorm Wind in ROCKINGHAM, NEW HAMPSHIRE
From 18-JUN-18 17:08:00 to 18-JUN-18 17:13:00 (EST-5)
Location: DERRY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed trees in Derry.

Thunderstorm Wind in ROCKINGHAM, NEW HAMPSHIRE
From 18-JUN-18 17:26:00 to 18-JUN-18 17:30:00 (EST-5)
Location: EPPING
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm downed trees on Route 125 in Epping.