A strong  cold front was approaching from the west on the afternoon of May 4th. Good shear combined with strong forcing to produce organized convection in the form of bowing line segments and some super cells. Thunderstorm wind damage was widespread with these storms as they moved through New Hampshire.

Thunderstorm Wind in COOS, NEW HAMPSHIRE
From 04-MAY-18 20:15:00 to 04-MAY-18 20:20:00 (EST-5)
Location: COLEBROOK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed a tree on Cunnington Lane in Colebrook.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 04-MAY-18 20:15:00 to 04-MAY-18 20:19:00 (EST-5)
Location: HAVERHILL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A severe thunderstorm downed trees and wires in Haverhill.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 04-MAY-18 20:20:00 to 04-MAY-18 20:25:00 (EST-5)
Location: ORFORD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A severe thunderstorm downed trees and wires on Route 10 at Grimes Hill Road in Orford.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 04-MAY-18 20:25:00 to 04-MAY-18 20:29:00 (EST-5)
Location: WARREN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A severe thunderstorm downed trees and wires closing Route 25C in Warren.

Thunderstorm Wind in CHESHIRE, NEW HAMPSHIRE
From 04-MAY-18 20:30:00 to 04-MAY-18 20:34:00 (EST-5)
Location: SPOFFORD
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A severe thunderstorm downed trees, wires and transformers at multiple locations in Spofford.

Thunderstorm Wind in CHESHIRE, NEW HAMPSHIRE
From 04-MAY-18 20:30:00 to 04-MAY-18 20:35:00 (EST-5)
Location: KEENE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A severe thunderstorm downed trees and wires in Keene.

Thunderstorm Wind in CHESHIRE, NEW HAMPSHIRE
From 04-MAY-18 20:30:00 to 04-MAY-18 20:35:00 (EST-5)
Location: WALPOLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

A severe thunderstorm downed trees in Walpole.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 04-MAY-18 20:33:00 to 04-MAY-18 20:37:00 (EST-5)
Location: EASTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm downed trees in Easton.

Thunderstorm Wind in CHESHIRE, NEW HAMPSHIRE
From 04-MAY-18 20:45:00 to 04-MAY-18 20:49:00 (EST-5)
Location: SWANZEY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed trees on West Swanzey Road in Swanzey.

Thunderstorm Wind in COOS, NEW HAMPSHIRE
From 04-MAY-18 20:45:00 to 04-MAY-18 20:50:00 (EST-5)
Location: GORHAM
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A severe thunderstorm downed trees closing Route 16 at the Shelbourne line in Gorham.

Thunderstorm Wind in GRAFTON, NEW HAMPSHIRE
From 04-MAY-18 20:50:00 to 04-MAY-18 20:54:00 (EST-5)
Location: LYFORDS SIDING
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm downed trees and wires in Lyfords Siding.

Thunderstorm Wind in HILLSBOROUGH, NEW HAMPSHIRE
From 04-MAY-18 20:50:00 to 04-MAY-18 20:55:00 (EST-5)
Location: BENNINGTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A severe thunderstorm downed trees blocking South Bennington Road in Bennington.

Thunderstorm Wind in HILLSBOROUGH, NEW HAMPSHIRE
From 04-MAY-18 20:54:00 to 04-MAY-18 20:58:00 (EST-5)
Location: NEW BOSTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A severe thunderstorm downed trees closing Route 77 in New Boston.

Thunderstorm Wind in MERRIMACK, NEW HAMPSHIRE
From 04-MAY-18 21:00:00 to 04-MAY-18 21:04:00 (EST-5)
Location: WEBSTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A severe thunderstorm downed trees and utility poles closing Route 127 in Webster.

Thunderstorm Wind in MERRIMACK, NEW HAMPSHIRE
From 04-MAY-18 21:04:00 to 04-MAY-18 21:09:00 (EST-5)
Location: HOPKINTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed trees on Cedar Street in Hopkinton.

Thunderstorm Wind in CARROLL, NEW HAMPSHIRE
From 04-MAY-18 21:05:00 to 04-MAY-18 21:09:00 (EST-5)
Location: CHOCORUA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A severe thunderstorm downed trees on wires closing Route 113 in Chocorua.

Thunderstorm Wind in HILLSBOROUGH, NEW HAMPSHIRE
From 04-MAY-18 21:06:00 to 04-MAY-18 21:10:00 (EST-5)
Location: EAST DEERING
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed power lines on Deering Center Road in East Deering.

Thunderstorm Wind in MERRIMACK, NEW HAMPSHIRE
From 04-MAY-18 21:06:00 to 04-MAY-18 21:11:00 (EST-5)
Location: DUNBARTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed power lines on Karen Road in Dunbarton.

Thunderstorm Wind in MERRIMACK, NEW HAMPSHIRE
From 04-MAY-18 21:08:00 to 04-MAY-18 21:13:00 (EST-5)
Location: LOUDON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A severe thunderstorm downed trees and wires in Loudon.

Thunderstorm Wind in HILLSBOROUGH, NEW HAMPSHIRE
From 04-MAY-18 21:10:00 to 04-MAY-18 21:14:00 (EST-5)
Location: WEARE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed a tree on Oak Hill Road in Weare.

Thunderstorm Wind in ROCKINGHAM, NEW HAMPSHIRE
From 04-MAY-18 21:15:00 to 04-MAY-18 21:19:00 (EST-5)
Location: DEERFIELD
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm knocked down tents and antennas at Deerfield Fairgrounds in Deerfield.

Thunderstorm Wind in HILLSBOROUGH, NEW HAMPSHIRE
From 04-MAY-18 21:20:00 to 04-MAY-18 21:25:00 (EST-5)
Location: MANCHESTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed power lines in Manchester.

Thunderstorm Wind in MERRIMACK, NEW HAMPSHIRE
From 04-MAY-18 21:20:00 to 04-MAY-18 21:25:00 (EST-5)
Location: HOOKSETT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed trees on the Londonderry Turnpike in Hooksett.

Thunderstorm Wind in ROCKINGHAM, NEW HAMPSHIRE
From 04-MAY-18 21:40:00 to 04-MAY-18 21:45:00 (EST-5)
Location: RAYMOND
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed a tree on Mountain Road in Raymond.

Thunderstorm Wind in STRAFFORD, NEW HAMPSHIRE
From 04-MAY-18 21:46:00 to 04-MAY-18 21:51:00 (EST-5)
Location: SOMERSWORTH
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed a tree on Otis Road in Somersworth.

Thunderstorm Wind in ROCKINGHAM, NEW HAMPSHIRE
From 04-MAY-18 21:44:00 to 04-MAY-18 21:48:00 (EST-5)
Location: NEWINGTON STATION
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet Station NHLBY in Newington recorded a 54 kt gust in a severe thunderstorm.

Thunderstorm Wind in MERRIMACK, NEW HAMPSHIRE
From 04-MAY-18 21:00:00 to 04-MAY-18 21:05:00 (EST-5)
Location: WARNER
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm downed a tree on a house on West Joppa Road in Warner.