With high pressure situated just off the eastern seaboard, a southerly flow allowed for a very warm and humid air mass to move into eastern New York.  Temperatures reached well into the 80s F with dewpoint temperatures into the 60s F as well.  An approaching upper level disturbance, aided by a surface pre-frontal trough, allowed thunderstorms to develop in the afternoon hours.  Although instability was limited due to areas of cloud cover in place, thunderstorms were able to organize into lines.  As a result, some of these thunderstorms became severe, producing damaging winds.  In addition, heavy rain accompanied these thunderstorms, and some flash flooding occurred as well.  As a result of the thunderstorm, power companies reported several thousand customers without power during the height of the storms.
As the upper level disturbance and surface trough moved away, the threat for thunderstorms ended by the early evening hours.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 27-MAY-15 15:50:00 to 27-MAY-15 15:50:00 (EST-5)
Location: STUYVESANT
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree limb and power line were reported down on State Route 9J in Stuyvesant due to thunderstorm winds.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 27-MAY-15 16:15:00 to 27-MAY-15 16:15:00 (EST-5)
Location: MOORHOUSE CORNER
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was downed and blocking a lane of the Taconic State Parkway in the town of Austerlitz due to thunderstorm winds.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 27-MAY-15 16:20:00 to 27-MAY-15 16:20:00 (EST-5)
Location: WEST LEBANON
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was downed and blocking Winslow Road in the town of New Lebanon due to thunderstorm winds.

Thunderstorm Wind in DUTCHESS, NEW YORK
From 27-MAY-15 17:15:00 to 27-MAY-15 17:15:00 (EST-5)
Location: MABBETTSVILLE
Magnitude: 50.00 EG
Reported by: Department of Highways

A tree was downed on Chestnut Ridge Road in the town of Washington due to thunderstorm winds.

Flash Flood in SARATOGA, NEW YORK
From 27-MAY-15 15:11:00 to 27-MAY-15 19:00:00 (EST-5)
Location: CLIFTON PARK CENTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain from thunderstorms produced flash flooding on Barney Road in Clifton Park. Nearly two inches of rain fell in under an hour.  As a result of this heavy rainfall, water entered a business on Barney Road.

Flash Flood in SARATOGA, NEW YORK
From 27-MAY-15 15:11:00 to 27-MAY-15 20:00:00 (EST-5)
Location: CLIFTON PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rainfall from thunderstorms led to flash flooding in Clifton Park.  Nearly two inches of rain fell in under an hour.  As a result of the heavy rain, the intersection of Crossing Boulevard and Route 9 was closed.  The nearby North Pointe Apartment Complex was impacted by the flood waters as well.

Lightning in SCHENECTADY, NEW YORK
From 27-MAY-15 14:15:00 to 27-MAY-15 14:15:00 (EST-5)
Location: SCHENECTADY
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A lightning strike caused a house to catch fire on Eastern Avenue in Schenectady.  The home's attic was damaged by fire and smoke and water damage occurred throughout the house.

Thunderstorm Wind in SARATOGA, NEW YORK
From 27-MAY-15 14:20:00 to 27-MAY-15 14:20:00 (EST-5)
Location: MALTAVILLE
Magnitude: 50.00 EG
Reported by: NWS Employee

Multiple trees were reported down on Cold Spring Road in the town of Malta due to thunderstorm winds.  A high tension power line was also downed due to the wind as well.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 27-MAY-15 16:00:00 to 27-MAY-15 16:00:00 (EST-5)
Location: VALATIE
Magnitude: 50.00 EG
Reported by: Fire Department/Rescue

A tree and wires were reported down in Valatie due to thunderstorm winds.

Thunderstorm Wind in ULSTER, NEW YORK
From 27-MAY-15 16:00:00 to 27-MAY-15 16:00:00 (EST-5)
Location: GLASCO
Magnitude: 50.00 EG
Reported by: Trained Spotter

Trees were reported down in Saugerties due to thunderstorm winds.  A portion of U.S. Route 9W was closed due to a tree across the roadway.

Thunderstorm Wind in DUTCHESS, NEW YORK
From 27-MAY-15 16:05:00 to 27-MAY-15 16:05:00 (EST-5)
Location: TIVOLI
Magnitude: 50.00 EG
Reported by: Utility Company

A large pine tree and utility wires were downed on Broadway in Tivoli due to thunderstorm winds.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 27-MAY-15 15:55:00 to 27-MAY-15 15:55:00 (EST-5)
Location: LORENZ PARK
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was reported down on wires on Paddock Place in Hudson due to thunderstorm winds.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 27-MAY-15 16:35:00 to 27-MAY-15 16:35:00 (EST-5)
Location: HILLSDALE
Magnitude: 50.00 EG
Reported by: 911 Call Center

Wires were reported down across Whippoorwill Road in Hillsdale due to thunderstorm winds.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 27-MAY-15 16:36:00 to 27-MAY-15 16:36:00 (EST-5)
Location: EAST HILLSDALE
Magnitude: 50.00 EG
Reported by: 911 Call Center

Trees and wires were reported down on Collins Street in Hillsdale due to thunderstorm winds.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 27-MAY-15 16:36:00 to 27-MAY-15 16:36:00 (EST-5)
Location: EAST HILLSDALE
Magnitude: 50.00 EG
Reported by: 911 Call Center

Trees and wires were reported down on State Route 22 in Hillsdale due to thunderstorm winds.