A warm, moist and unstable airmass was in place across the region with a slow moving cold front approaching from the Great Lakes Region. A pre-frontal trough developed ahead of the approaching cold front Sunday afternoon, September 4th, and this, in combination with the approach of an upper level trough, triggered convection across east central New York during the mid afternoon into the early evening. The storms produced very heavy rainfall which resulted in some flash flooding. The severe thunderstorms produced damaging winds. A supercell developed over Montgomery County, where a tornado touched down before tracking northeastward into Schenectady County.

Tornado in MONTGOMERY, NEW YORK
From 04-SEP-11 16:20:00 to 04-SEP-11 16:25:00 (EST-5)
Location: SOUTH AMSTERDAM
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down in the Town of Florida in Montgomery County. It moved northeast to the western end of Glenville in Schenectady County. Damage was extensive along the entire path length, with the worst damage in the Town of Cranesville in Montgomery County. Damage included numerous trees snapped off and uprooted, broken windows to homes, shingles stripped off roof tops, and some houses which had parts of their roofs torn off. Numerous sheds and out buildings were destroyed. The tornado was caught on video from the Mohawk Travel Plaza rest area on the New York State Thruway.

Tornado in SCHENECTADY, NEW YORK
From 04-SEP-11 16:25:00 to 04-SEP-11 16:35:00 (EST-5)
Location: GLENVILLE
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A tornado touched down in the Town of Florida in Montgomery County. It moved northeast to the western end of Glenville in Schenectady County. Damage was extensive along the entire path length, with the worst damage in the Town of Cranesville in Montgomery County. Damage included numerous trees snapped off and uprooted, broken windows to homes, shingles stripped off roof tops, and some houses which had parts of their roofs torn off. Numerous sheds and out buildings were destroyed.

Hail in HERKIMER, NEW YORK
From 04-SEP-11 14:50:00 to 04-SEP-11 14:52:00 (EST-5)
Location: SALISBURY CENTER
Magnitude: 1.00 
Reported by: Public

Quarter size hail was reported during a thunderstorm approximately 1 mile west of Stratford.

Hail in SARATOGA, NEW YORK
From 04-SEP-11 17:10:00 to 04-SEP-11 17:12:00 (EST-5)
Location: CLIFTON PARK
Magnitude: 0.75 
Reported by: Trained Spotter

Penny size hail was reported during a thunderstorm in Clifton Park.

Thunderstorm Wind in HERKIMER, NEW YORK
From 04-SEP-11 15:20:00 to 04-SEP-11 15:20:00 (EST-5)
Location: FAIRFIELD
Magnitude: 50.00 EG
Reported by: Emergency Manager

Two poles were reported down in a field near the intersection of Hard Scrabble Road and Parkhurst Road in Fairfield due to strong thunderstorm winds.

Thunderstorm Wind in HERKIMER, NEW YORK
From 04-SEP-11 15:05:00 to 04-SEP-11 15:05:00 (EST-5)
Location: BURRELL CORNERS
Magnitude: 50.00 EG
Reported by: Emergency Manager

A large limb was reported down on Dairy Hill Road in Salisbury Center due to strong thunderstorm winds.

Thunderstorm Wind in HERKIMER, NEW YORK
From 04-SEP-11 14:10:00 to 04-SEP-11 14:10:00 (EST-5)
Location: FAIRFIELD
Magnitude: 50.00 EG
Reported by: CoCoRaHS

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

Thunderstorm Wind in MONTGOMERY, NEW YORK
From 04-SEP-11 16:20:00 to 04-SEP-11 16:20:00 (EST-5)
Location: CRANESVILLE
Magnitude: 50.00 EG
Reported by: Emergency Manager

Trees were reported down due to strong thunderstorm winds and were blocking the New York State Thruway, I-90, between mile marker 171 and 172.

Funnel Cloud in MONTGOMERY, NEW YORK
From 04-SEP-11 16:20:00 to 04-SEP-11 16:20:00 (EST-5)
Location: AMSTERDAM
Reported by: Emergency Manager

The New York State Thruway Authority reported a funnel cloud near the Mohawk Travel Plaza.

Thunderstorm Wind in HERKIMER, NEW YORK
From 04-SEP-11 16:47:00 to 04-SEP-11 16:47:00 (EST-5)
Location: MOHAWK
Magnitude: 50.00 EG
Reported by: Emergency Manager

Trees and wires were reported down on Walnut Street, Henry Street, Michigan Street and Columbia Street in Mohawk due to strong thunderstorm winds.

Thunderstorm Wind in HERKIMER, NEW YORK
From 04-SEP-11 15:05:00 to 04-SEP-11 15:05:00 (EST-5)
Location: BURRELL CORNERS
Magnitude: 50.00 EG
Reported by: Emergency Manager

A tree was reported down on Burrell Road near the intersection of Military Road in Salisbury Center due to strong thunderstorm winds.

Flash Flood in HERKIMER, NEW YORK
From 04-SEP-11 16:45:00 to 05-SEP-11 04:30:00 (EST-5)
Location: HERKIMER LAMANNA ARP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Streams were reported out of their banks in Mohawk, Ilion, Frankfort. Herkimer and Middleville with some road wash outs. Moyer Creek in Frankfort was reported overflowing its banks around 7 pm. At Brice Road flood waters from the Moyer Creek surrounded  three homes and the water was reported going over the bridge at West Main Street near Cemetery Road.

Thunderstorm Wind in SARATOGA, NEW YORK
From 04-SEP-11 17:00:00 to 04-SEP-11 17:10:00 (EST-5)
Location: JONESVILLE
Magnitude: 50.00 EG
Reported by: Trained Spotter

Trees and numerous limbs were reported down across southern Saratoga County due to strong thunderstorm winds.

Thunderstorm Wind in SARATOGA, NEW YORK
From 04-SEP-11 16:50:00 to 04-SEP-11 17:00:00 (EST-5)
Location: CHARLTON
Magnitude: 50.00 EG
Reported by: NWS Employee

Numerous trees, limbs and wires were reported down across southern Saratoga County due to strong thunderstorm winds.

Thunderstorm Wind in WASHINGTON, NEW YORK
From 04-SEP-11 17:30:00 to 04-SEP-11 17:30:00 (EST-5)
Location: EAGLE BRIDGE
Magnitude: 50.00 EG
Reported by: Trained Spotter

Trees were reported down in Buskirk due to strong thunderstorm winds.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 04-SEP-11 17:30:00 to 04-SEP-11 17:30:00 (EST-5)
Location: PITTSTOWN
Magnitude: 50.00 EG
Reported by: State Official

Trees and wires were reported down in Pittstown due to strong thunderstorm winds.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 04-SEP-11 17:30:00 to 04-SEP-11 17:30:00 (EST-5)
Location: TOMHANNOCK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees and wires were reported down at the Tomhannock Reservoir due to strong thunderstorm winds.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 04-SEP-11 18:04:00 to 04-SEP-11 18:04:00 (EST-5)
Location: HOOSICK
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: State Official

A tree was reported down on a house on Pine Valley Road in Hoosick due to strong thunderstorm winds.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 04-SEP-11 18:19:00 to 04-SEP-11 18:19:00 (EST-5)
Location: HOOSICK FALLS
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: State Official

A tree was reported down on a house on Kokley Avenue in Hoosick Falls due to strong thunderstorm winds.

Thunderstorm Wind in HERKIMER, NEW YORK
From 04-SEP-11 16:59:00 to 04-SEP-11 16:59:00 (EST-5)
Location: MANHEIM CENTER
Magnitude: 50.00 EG
Reported by: Emergency Manager

Two people were reported trapped between two fallen trees approximately 2 miles southeast of the Village of Little Falls due to strong thunderstorm winds. There were no injuries.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 04-SEP-11 17:30:00 to 04-SEP-11 17:30:00 (EST-5)
Location: SCHAGHTICOKE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Trees and wires were reported down in Schaghticoke due to strong thunderstorm winds and the fairground was shut down. A person was injuried.