A pre-frontal surface trough developed over southern New England, providing a focus for low level convection.  Plenty of instability, as well as a strong upper jet aloft, allowed several of these storms to become severe, producing damaging winds.  A very moist, tropical-like atmosphere resulted in very heavy rainfall which produced flash flooding, mainly across southwestern New Hampshire.

Lightning in HILLSBOROUGH, NEW HAMPSHIRE
From 12-SEP-13 11:15:00 to 12-SEP-13 11:15:00 (EST-5)
Location: BEDFORD
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Lightning struck an attached garage on Reed Drive in Bedford, NH, starting a fire.

Thunderstorm Wind in CHESHIRE, NEW HAMPSHIRE
From 12-SEP-13 12:45:00 to 12-SEP-13 12:45:00 (EST-5)
Location: KEENE
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Trees and wires on Emerald and Island Streets were downed by thunderstorm winds.

Thunderstorm Wind in CHESHIRE, NEW HAMPSHIRE
From 12-SEP-13 13:20:00 to 12-SEP-13 13:20:00 (EST-5)
Location: NELSON
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A tree and wires on Nubanusit Road were downed by thunderstorm winds.

Thunderstorm Wind in HILLSBOROUGH, NEW HAMPSHIRE
From 12-SEP-13 13:20:00 to 12-SEP-13 13:20:00 (EST-5)
Location: GREENFIELD
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A tree and wires on Sawmill Road were downed by thunderstorm winds.

Flash Flood in CHESHIRE, NEW HAMPSHIRE
From 12-SEP-13 13:14:00 to 12-SEP-13 15:00:00 (EST-5)
Location: SULLIVAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

In Keene, Ralston Street was closed due to flooding.  Winchester and Main Streets were flooded and impassable.  A basement was flooded along Cache Road in Chesterfield.

Lightning in HILLSBOROUGH, NEW HAMPSHIRE
From 12-SEP-13 15:08:00 to 12-SEP-13 15:08:00 (EST-5)
Location: BEDFORD
Property damage: 45.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Lightning struck a tree, then traveled underground, hit an electrical box and started fires in three condos.

Thunderstorm Wind in HILLSBOROUGH, NEW HAMPSHIRE
From 12-SEP-13 13:20:00 to 12-SEP-13 13:20:00 (EST-5)
Location: BENNINGTON
Magnitude: 50.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A tree and wires on South Bennington Road were downed by thunderstorm winds.  A tree on Greenfield Road was downed onto a house.  A tree and wires were downed by thunderstorm winds.

Flash Flood in CHESHIRE, NEW HAMPSHIRE
From 12-SEP-13 15:43:00 to 12-SEP-13 18:00:00 (EST-5)
Location: MUNSONVILLE
Flood cause: Heavy Rain
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Heavy rain resulted in flash flooding across much of Cheshire County.  Four to six inches of rain fell in just a few hours across parts of the area.  In Keene, water ten inches deep flooded Church and Roxbury Streets.  The basement of city hall was flooded.  Six inches of water flooded Blake Street.  Eastern Avenue and Washington Street were flooded and impassable, with at least one flooded basement.  A portion of Woodland Avenue washed out.  Flooded basements were reported along Martin and Beech Streets.  Water, Concord, Bellevue, Sullivan, Rule, Roxbury, and North Lincoln Streets as well as Woodland and Eastern Avenues, Old Concord Road, and Roxbury Road were all damaged by the flooding.  In Swanzey, Homestead Avenue and Swanzey Factory Road were flooded and impassable.  A house along Homestead Avenue had a flooded basement.  Wheelock Brook overflowed its banks onto Cobble Hill Road.  In Sullivan, Otter Brook overflowed its banks onto the Centre Street bridge, depositing mud and other debris onto the bridge.  In Harrisville, Chesham Road was washed out near the intersection with Old Chesham Road.  In Jaffrey, a basement was flooded along Pine Street.  North Street was flooded and impassable.

Thunderstorm Wind in CHESHIRE, NEW HAMPSHIRE
From 12-SEP-13 13:16:00 to 12-SEP-13 13:16:00 (EST-5)
Location: SPOFFORD
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A tree and wires on Spring Street were downed by thunderstorm winds.

Flood in HILLSBOROUGH, NEW HAMPSHIRE
From 12-SEP-13 19:56:00 to 12-SEP-13 21:00:00 (EST-5)
Location: HANCOCK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Jaffrey Road was flooded and impassable.