During the day on May 29th, a warm front lifted northward across eastern New York.  Although the day began cloudy, some breaks of sun started to occur by early afternoon.  At the same time, a potent upper level disturbance over Ontario started to approach the region and a strong jet streak was located just to the north.  With a moist southerly flow moving into the region at the surface, it became rather humid as well.
With all these ingredients coming together, thunderstorms developed across western and central New York by mid afternoon and they began to spread eastward into eastern New York by the late afternoon and evening hours.  Many of the thunderstorms organized into a strong squall line, producing widespread wind damage, especially across northern portions of the Capital Region and in the mid-Hudson Valley. These thunderstorms produced a significant amount of lightning, as well, which in combination with the widespread wind damage, led to a significant number of power outages across the area.  Many schools in the Capital Region were delayed or closed on Thursday, May 30th as a result of the power outages.
In addition, a few supercell thunderstorms developed ahead of the line.  Three tornadoes were spawned by these supercell storms across the Capital Region and Schoharie County.  The strongest tornado was rated EF2 by a National Weather Service storm survey, and tracked on the ground for 13 miles across eastern Montgomery and Schenectady Counties.  One injury occurred as a result of this tornado, as a man was pulled out of a barn by the force of the wind.  Significant damage to trees occurred, along with damage to high tension power line towers and roofs blown off houses.  The other tornadoes were rated EF1, were rather short-lived and mainly caused damage to trees.
With the region already rather saturated from repeated thunderstorms over the past week, the additional heavy rainfall that occurred caused flash flooding in some areas. This caused roads to be closed due to being impassable by flowing water.
Thunderstorms pushed east of the area by around midnight, ending the threat of severe weather.

Thunderstorm Wind in ALBANY, NEW YORK
From 29-MAY-13 18:14:00 to 29-MAY-13 18:14:00 (EST-5)
Location: LATHAM
Magnitude: 60.00 EG
Reported by: Trained Spotter

Multiple trees were reported down in Latham due to thunderstorm winds, including one blocking Park Avenue.

Thunderstorm Wind in SCHOHARIE, NEW YORK
From 29-MAY-13 17:57:00 to 29-MAY-13 17:57:00 (EST-5)
Location: JEFFERSON
Magnitude: 50.00 EG
Reported by: 911 Call Center

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

Thunderstorm Wind in ALBANY, NEW YORK
From 29-MAY-13 18:10:00 to 29-MAY-13 18:10:00 (EST-5)
Location: SHAKERS
Magnitude: 60.00 EG
Reported by: Public

A member of public reported a large tree fell on a house as a result of thunderstorm winds in Colonie.

Thunderstorm Wind in SARATOGA, NEW YORK
From 29-MAY-13 18:20:00 to 29-MAY-13 18:20:00 (EST-5)
Location: CLIFTON PARK CENTER
Magnitude: 52.00 EG
Reported by: NWS Employee

A National Weather Service employee estimated a thunderstorm wind gust to 60 mph in Clifton Park.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 29-MAY-13 18:30:00 to 29-MAY-13 18:30:00 (EST-5)
Location: CROPSEYVILLE
Magnitude: 60.00 EG
Reported by: Trained Spotter

Numerous trees were reported down due to thunderstorm winds in Brunswick.

Flash Flood in SARATOGA, NEW YORK
From 29-MAY-13 18:40:00 to 29-MAY-13 20:10:00 (EST-5)
Location: HALFMOON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported that an inch and a half of rain from a thunderstorm fell in 20 minutes, resulting in localized flash flooding in Halfmoon.

Flash Flood in HERKIMER, NEW YORK
From 29-MAY-13 17:20:00 to 29-MAY-13 20:00:00 (EST-5)
Location: EAST HERKIMER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

As a result of thunderstorm heavy rains, emergency management in Herkimer County reported a mudslide occurred on Route 28 between Herkimer and Middleville.  The route needed to be temporarily closed.

Thunderstorm Wind in SCHENECTADY, NEW YORK
From 29-MAY-13 18:04:00 to 29-MAY-13 18:05:00 (EST-5)
Location: SCHENECTADY
Magnitude: 60.00 EG
Reported by: Social Media

A member of the public reported through Twitter that thunderstorm winds toppled a large tree in Schenectady on State Street. A National Weather Service employee found additional wind damage along Balltown Road near Consaul Road as well.

Heavy Rain in SCHENECTADY, NEW YORK
From 29-MAY-13 18:07:00 to 29-MAY-13 20:00:00 (EST-5)
Location: SCOTIA
Reported by: Fire Department/Rescue

Local fire department officials reported heavy rainfall from thunderstorms led to significant runoff of water and dirt onto roads in Scotia.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 29-MAY-13 19:05:00 to 29-MAY-13 19:05:00 (EST-5)
Location: HUDSON
Magnitude: 60.00 EG
Reported by: 911 Call Center

Multiple trees were reported down in the city of Hudson as a result of thunderstorm winds.  In addition, the steeple of a church built in 1869 also collapsed as a result of thunderstorm winds.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 29-MAY-13 19:10:00 to 29-MAY-13 19:10:00 (EST-5)
Location: LORENZ PARK
Magnitude: 60.00 EG
Reported by: 911 Call Center

Multiple trees were reported down as a result of thunderstorm winds in Greenport Center.

Thunderstorm Wind in DUTCHESS, NEW YORK
From 29-MAY-13 19:52:00 to 29-MAY-13 19:52:00 (EST-5)
Location: HAMMERTOWN
Magnitude: 50.00 EG
Reported by: Amateur Radio

Multiple trees were reported down in Pine Plains due to thunderstorm winds. One large tree fell across Carpenter Hill Road near Route 82.

Flash Flood in RENSSELAER, NEW YORK
From 29-MAY-13 19:20:00 to 29-MAY-13 20:10:00 (EST-5)
Location: RAYMERTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple roads were reported to be washed out in Raymertown due to flash flooding.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 29-MAY-13 18:30:00 to 29-MAY-13 18:30:00 (EST-5)
Location: RAYMERTOWN
Magnitude: 50.00 EG
Reported by: Trained Spotter

Multiple trees were reported down and on house as result of thunderstorm winds in Raymertown.

Thunderstorm Wind in SCHENECTADY, NEW YORK
From 29-MAY-13 18:06:00 to 29-MAY-13 18:06:00 (EST-5)
Location: NISKAYUNA
Magnitude: 60.00 EG
Reported by: Trained Spotter

Multiple trees were reported down on Vly Road in Niskayuna as a result of thunderstorm winds.

Thunderstorm Wind in SCHENECTADY, NEW YORK
From 29-MAY-13 18:05:00 to 29-MAY-13 18:05:00 (EST-5)
Location: NISKAYUNA
Magnitude: 60.00 EG
Reported by: Public

A member of the public reported a 40 foot tree down on Pinecrest Drive in Niskayuna as a result of thunderstorm winds.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 29-MAY-13 18:25:00 to 29-MAY-13 18:25:00 (EST-5)
Location: SYCAWAY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

The roof to a residence hall at Rensselear Polytechnic Institute in Troy was reported to be damaged due to thunderstorm winds. Trees and power lines in Troy were also reported to be down as a result of thunderstorm winds.

Tornado in MONTGOMERY, NEW YORK
From 29-MAY-13 17:47:00 to 29-MAY-13 17:48:00 (EST-5)
Location: SCOTCH BUSH
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A National Weather Service storm survey determine that a tornado touched down in near Bernaski Road in Scotch Bush in the town of Florida. The tornado was only on the ground in Montgomery County for just under one mile before it crossed into Schenectady County border while traveling east.
The tornado caused damage to a home along Bernaski Road, with half of the roof blown off.  Grass was lifted and splattered on three sides of the home.  Many windows were also blown out of the house. Nearby, a hundred year old barn was destroyed.  A flagpole was ripped out of the ground.  Trees were uprooted and/or split in half as well. Residents recalled seeing a funnel before taking cover.

Tornado in SARATOGA, NEW YORK
From 29-MAY-13 18:10:00 to 29-MAY-13 18:11:00 (EST-5)
Location: VISCHER FERRY
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A National Weather Service storm survey determined that an EF1 tornado touched down in Vischer Ferry.  The tornado tore the roof off a well-built shed near the intersection of Riverview Road and Willow Springs Drive.  In addition, the tornado blew out windows of a home, shifted a barn off its foundation and damaged approximately 100 trees. The tornado was on the ground just shy of one mile before lifting.  The same supercell thunderstorm responsible for producing this tornado also produced another tornado further west across Montgomery and Schencetady counties.

Tornado in SCHOHARIE, NEW YORK
From 29-MAY-13 17:57:00 to 29-MAY-13 18:02:00 (EST-5)
Location: JEFFERSON
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A National Weather Service storm survey determined that a tornado touched down along the side of a mountain ridge.  Dozens of softwood and hardwood trees were sheared off or toppled in different directions. The tornado was an on the ground for nearly 1.6 miles, but due to the rural and mountainous location, only did damage to trees.

Hail in HERKIMER, NEW YORK
From 29-MAY-13 16:45:00 to 29-MAY-13 16:47:00 (EST-5)
Location: FAIRFIELD
Magnitude: 1.00 
Reported by: Trained Spotter

A trained spotter reported nickel to quarter size hail from a thunderstorm covering the ground in Fairfield.

Thunderstorm Wind in HERKIMER, NEW YORK
From 29-MAY-13 16:50:00 to 29-MAY-13 16:50:00 (EST-5)
Location: MANHEIM CENTER
Magnitude: 50.00 EG
Reported by: Trained Spotter

A trained spotter reported wires down as a result of thunderstorm winds near Manheim Center.

Thunderstorm Wind in HERKIMER, NEW YORK
From 29-MAY-13 16:55:00 to 29-MAY-13 16:55:00 (EST-5)
Location: DOLGEVILLE
Magnitude: 50.00 EG
Reported by: Trained Spotter

A trained spotter reported trees down and across a road in Dolgeville as a result of thunderstorm winds.

Thunderstorm Wind in HERKIMER, NEW YORK
From 29-MAY-13 17:02:00 to 29-MAY-13 17:02:00 (EST-5)
Location: HARBOR
Magnitude: 50.00 EG
Reported by: Trained Spotter

A trained spotter reported trees and wires down on Argyle Road in Frankfort Center due to thunderstorm winds.

Thunderstorm Wind in HERKIMER, NEW YORK
From 29-MAY-13 17:07:00 to 29-MAY-13 17:07:00 (EST-5)
Location: FRANKFORT
Magnitude: 50.00 EG
Reported by: Trained Spotter

A trained spotter reported wires down on 5th Ave at Reese Road in Frankfort due to thunderstorm winds.

Thunderstorm Wind in HERKIMER, NEW YORK
From 29-MAY-13 17:08:00 to 29-MAY-13 17:08:00 (EST-5)
Location: ILION
Magnitude: 50.00 EG
Reported by: Trained Spotter

A trained spotter reported a tree down and on a house as result of thunderstorm winds in Ilion.

Flash Flood in HERKIMER, NEW YORK
From 29-MAY-13 17:12:00 to 29-MAY-13 20:00:00 (EST-5)
Location: MANHEIM CENTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported heavy rainfall led to flash flooding along Route 167 and Snells Bush Road.  The roads were temporarily closed due to the flooding.

Flash Flood in HERKIMER, NEW YORK
From 29-MAY-13 17:30:00 to 29-MAY-13 20:00:00 (EST-5)
Location: DOLGEVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported heavy rainfall led to flash flooding in Dolgeville.  Multiple culverts were washed out and there was 4 to 5 inches of water running across Main Street.

Thunderstorm Wind in MONTGOMERY, NEW YORK
From 29-MAY-13 17:35:00 to 29-MAY-13 17:35:00 (EST-5)
Location: MINAVILLE
Magnitude: 50.00 EG
Reported by: Public

A member of the public reported a tree downed by thunderstorm winds was blocking Langley Road in Minaville.

Thunderstorm Wind in ALBANY, NEW YORK
From 29-MAY-13 18:15:00 to 29-MAY-13 18:16:00 (EST-5)
Location: BOGHT CORNERS
Magnitude: 50.00 EG
Reported by: Trained Spotter

Multiple large trees were reported knocked down or uprooted due to thunderstorms winds in a stretch along Route 9R between Cora Drive and St. Agnes Highway in Cohoes.  One of the trees fell on a home.  Many large branches were down along the roadway.

Thunderstorm Wind in SCHOHARIE, NEW YORK
From 29-MAY-13 17:50:00 to 29-MAY-13 17:50:00 (EST-5)
Location: SCHOHARIE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

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

Thunderstorm Wind in SCHENECTADY, NEW YORK
From 29-MAY-13 18:03:00 to 29-MAY-13 18:03:00 (EST-5)
Location: CARMAN
Magnitude: 50.00 EG
Reported by: Trained Spotter

A trained spotter reported a tree down on Vanwormer Road in Rotterdam due to thunderstorm winds.

Thunderstorm Wind in SCHENECTADY, NEW YORK
From 29-MAY-13 18:05:00 to 29-MAY-13 18:05:00 (EST-5)
Location: CARMAN
Magnitude: 50.00 EG
Reported by: Trained Spotter

A trained spotter reported a tree was downed due to thunderstorm winds on Willow Creek Road in Schenectady.

Thunderstorm Wind in ALBANY, NEW YORK
From 29-MAY-13 18:09:00 to 29-MAY-13 18:09:00 (EST-5)
Location: HARTMANS CORNERS
Magnitude: 50.00 EG
Reported by: Amateur Radio

A large tree was reported to be knocked down due to thunderstorm winds on Willow Street in Guilderland.

Thunderstorm Wind in ALBANY, NEW YORK
From 29-MAY-13 18:07:00 to 29-MAY-13 18:07:00 (EST-5)
Location: MAYWOOD
Magnitude: 60.00 EG
Reported by: Trained Spotter

Two trees were reported down due to thunderstorm winds in Colonie.

Thunderstorm Wind in ALBANY, NEW YORK
From 29-MAY-13 18:15:00 to 29-MAY-13 18:15:00 (EST-5)
Location: GLENMONT
Magnitude: 52.00 MG
Reported by: Trained Spotter

A weather spotter for a local television station reported a measured wind gust of 60 mph in Glenmont.

Tornado in SCHENECTADY, NEW YORK
From 29-MAY-13 17:48:00 to 29-MAY-13 18:04:00 (EST-5)
Location: MARIAVILLE
Tornado F-scale: EF2
Reported by: NWS Storm Survey

A National Weather Service storm survey determined that a tornado tracked from the Montgomery County border through the towns of Duanesburg, Princetown, Rotterdam and into the city of Schenectady.
The tornado entered the county as an EF1 and strengthened to EF2 strength when reaching the hamlet of Mariaville Lake in the town of Duanesburg. Many trees were splintered in half or uprooted.  Several barns and a shed were destroyed or heavily damaged.  One barn was impaled by pieces of debris.  An ATV vehicle was moved 100 feet by the force of the wind and an RV was blown over.  Homes had damaged to roofs and windows were blown out of cars as well.  One person was inside a barn at the time the tornado hit.  He was picked up into the air by the tornado and injured by flying debris, suffering lacerations to his head and back.
Further east along the path, the tornado toppled or heavily damaged high tension power line towers that were 90 to 120 feet tall.  The tornado weakened as it moved eastward into Rotterdam, but continued to cause significant damage to trees.  The tornado crossed Interstate 90 (New York State Thruway) and weakened to EF0 strength as it passed close to the Rotterdam Square Mall.  The tornado then entered the city of Schenectady and lifted around the vicinity of Hillhurst Park in the Bellevue section of Schenectady.

Flash Flood in RENSSELAER, NEW YORK
From 29-MAY-13 19:25:00 to 29-MAY-13 20:10:00 (EST-5)
Location: PITTSTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple roads were reported to be washed out in Pittstown due to flash flooding.