A nearly stationary frontal boundary was draped across western and northern New York State as several waves of low pressure moved easterly along the boundary. In addition, a warm front lifted northeastward across the east central New York during the morning hours. The passage of the warm front ushered in a warm, humid and unstable airmass.
Two rounds of severe thunderstorms occurred across east central New York during the afternoon and evening hours of Thursday, May 26th. The first round occurred during the mid to late afternoon hours, in which embedded supercellular development occurred, especially across the southern and western Adirondacks with reports of large hail. The second round of severe weather occurred during the late evening hours. A large bowing segment of thunderstorms tracked east from the Catskills and Schoharie Valley into western New England causing wind damage and power outages. Power was not restored in some areas until Friday night, May 27th.

Thunderstorm Wind in SCHENECTADY, NEW YORK
From 26-MAY-11 22:00:00 to 26-MAY-11 22:00:00 (EST-5)
Location: SCHENECTADY
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Newspaper

Part of a large maple tree was reported downed by strong thunderstorm winds on Grand Boulevard in Niskayuna.

Thunderstorm Wind in DUTCHESS, NEW YORK
From 26-MAY-11 22:05:00 to 26-MAY-11 22:05:00 (EST-5)
Location: TIVOLI
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

Many old locust trees were reported snapped off by strong thunderstorm winds in Tivoli.

Thunderstorm Wind in ULSTER, NEW YORK
From 26-MAY-11 22:05:00 to 26-MAY-11 22:05:00 (EST-5)
Location: SAUGERTIES SOUTH
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

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

Hail in HAMILTON, NEW YORK
From 26-MAY-11 15:26:00 to 26-MAY-11 15:31:00 (EST-5)
Location: LONG LAKE
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Park/Forest Service

Golf ball size hail was reported during a thunderstorm at the Lake Eaton Campground.

Hail in HAMILTON, NEW YORK
From 26-MAY-11 15:30:00 to 26-MAY-11 15:35:00 (EST-5)
Location: LONG LAKE
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Public

Half dollar size hail was reported in Long Lake during a thunderstorm.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 26-MAY-11 22:25:00 to 26-MAY-11 22:25:00 (EST-5)
Location: LIVINGSTON
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

A tree was reported down and blocking Route 9 in Livingston due to strong thunderstorm winds.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 26-MAY-11 22:43:00 to 26-MAY-11 22:43:00 (EST-5)
Location: NORTH HOOSICK
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down along Route 67 in North Hoosick due to strong thunderstorm winds.

Thunderstorm Wind in FULTON, NEW YORK
From 26-MAY-11 21:50:00 to 26-MAY-11 21:50:00 (EST-5)
Location: CRANBERRY CREEK
Magnitude: 60.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Two to three dozen trees and four utility poles were reported down due to strong thunderstorm winds at Northhampton Beach campsites. Seven camp trailers were reported damaged.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 26-MAY-11 22:40:00 to 26-MAY-11 22:40:00 (EST-5)
Location: DUNHAM HOLLOW
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down on Dunham Road in Nassau due to strong thunderstorm winds.

Hail in COLUMBIA, NEW YORK
From 26-MAY-11 22:45:00 to 26-MAY-11 22:48:00 (EST-5)
Location: CANAAN
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported in Canaan during a thunderstorm with an estimated wind gust of 60 mph.

Thunderstorm Wind in SCHENECTADY, NEW YORK
From 26-MAY-11 21:58:00 to 26-MAY-11 21:58:00 (EST-5)
Location: HOFFMANS
Magnitude: 55.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

A barn was reported destroyed by strong thunderstorm winds at Peaceful Acres Horses on Rynex Corners Road in Pattersonville.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 26-MAY-11 22:34:00 to 26-MAY-11 22:34:00 (EST-5)
Location: KINDERHOOK
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

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

Hail in SCHOHARIE, NEW YORK
From 26-MAY-11 16:05:00 to 26-MAY-11 16:10:00 (EST-5)
Location: NORTH BLENHEIM
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Utility Company

Penny size hail was reported at the New York Power Authority during a thunderstorm.

Hail in SCHOHARIE, NEW YORK
From 26-MAY-11 15:47:00 to 26-MAY-11 15:52:00 (EST-5)
Location: NORTH BLENHEIM
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail was reported in North Blenheim during a thunderstorm.

Thunderstorm Wind in SARATOGA, NEW YORK
From 26-MAY-11 22:05:00 to 26-MAY-11 22:05:00 (EST-5)
Location: FAYVILLE
Magnitude: 55.00 EG
Crop damage: 0.00K
Reported by: Public

Numerous trees and limbs were reported down along South Shore Road in Edinburg and Providence due to strong thunderstorm winds. Also, a tree was reported down on Fox Hill Road in Edinburg.

Thunderstorm Wind in ALBANY, NEW YORK
From 26-MAY-11 22:00:00 to 26-MAY-11 22:00:00 (EST-5)
Location: VOORHEESVILLE
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

A tent collapsed behind the Voorheesville Fire Department and a tree was reported down on Maple Avenue due to strong thunderstorm winds.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 26-MAY-11 22:24:00 to 26-MAY-11 22:24:00 (EST-5)
Location: TROY
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down at 102nd Street and 8th Avenue in Troy due to strong thunderstorm winds.

Hail in SCHENECTADY, NEW YORK
From 26-MAY-11 16:38:00 to 26-MAY-11 16:43:00 (EST-5)
Location: GLENVILLE
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was reported during a thunderstorm in Glenville.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 26-MAY-11 22:47:00 to 26-MAY-11 22:47:00 (EST-5)
Location: LEBANON SPGS
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was reported down across Route 22 in New Lebanon due to strong thunderstorm winds.

Thunderstorm Wind in WASHINGTON, NEW YORK
From 26-MAY-11 22:50:00 to 26-MAY-11 22:50:00 (EST-5)
Location: CENTER CAMBRIDGE
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down on Center Cambridge Road in Cambridge due to strong thunderstorm winds.

Thunderstorm Wind in WASHINGTON, NEW YORK
From 26-MAY-11 22:50:00 to 26-MAY-11 22:50:00 (EST-5)
Location: CENTER FALLS
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Wires were reported down on Route 29 near By Pass Road in Greenwich due to strong thunderstorm winds.

Hail in FULTON, NEW YORK
From 26-MAY-11 17:00:00 to 26-MAY-11 17:05:00 (EST-5)
Location: UNION MILLS
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: Public

Nickel size hail was reported in Fish House during a thunderstorm by a WeatherNet6 spotter.

Thunderstorm Wind in MONTGOMERY, NEW YORK
From 26-MAY-11 21:30:00 to 26-MAY-11 21:30:00 (EST-5)
Location: CANAJOHARIE
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: State Official

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

Thunderstorm Wind in RENSSELAER, NEW YORK
From 26-MAY-11 22:59:00 to 26-MAY-11 22:59:00 (EST-5)
Location: HOOSICK FALLS
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was reported down on a car on Abbott Street in Hoosick Falls due to strong thunderstorm winds.

Thunderstorm Wind in ULSTER, NEW YORK
From 26-MAY-11 21:35:00 to 26-MAY-11 21:35:00 (EST-5)
Location: ELLENVILLE
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

A tree and limbs were reported down across Carl Street in Ellenville due to strong thunderstorm winds.

Thunderstorm Wind in SCHOHARIE, NEW YORK
From 26-MAY-11 21:38:00 to 26-MAY-11 21:38:00 (EST-5)
Location: SUMMIT
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

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

Thunderstorm Wind in SCHOHARIE, NEW YORK
From 26-MAY-11 21:48:00 to 26-MAY-11 21:48:00 (EST-5)
Location: SHARON SPGS
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

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

Thunderstorm Wind in SCHOHARIE, NEW YORK
From 26-MAY-11 21:50:00 to 26-MAY-11 21:50:00 (EST-5)
Location: MIDDLEBURG
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down across State Route 30 and Huntersland Road in Middleburgh due to strong thunderstorm winds.

Thunderstorm Wind in ULSTER, NEW YORK
From 26-MAY-11 21:50:00 to 26-MAY-11 21:50:00 (EST-5)
Location: CHICHESTER
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

Large tree branches were reported down blocking Park Road in Chichester due to strong thunderstorm winds.

Thunderstorm Wind in SCHOHARIE, NEW YORK
From 26-MAY-11 21:53:00 to 26-MAY-11 21:53:00 (EST-5)
Location: SCHOHARIE
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

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

Thunderstorm Wind in SCHENECTADY, NEW YORK
From 26-MAY-11 22:05:00 to 26-MAY-11 22:05:00 (EST-5)
Location: GLENVILLE
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported an estimated wind gust of 58 mph in West Glenville.

Thunderstorm Wind in ALBANY, NEW YORK
From 26-MAY-11 22:00:00 to 26-MAY-11 22:00:00 (EST-5)
Location: GUILDERLAND CENTER
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Newspaper

The sign for the Park Guilderland Apartments in Guilderland Center was reportedly blown over by strong thunderstorm winds.

Thunderstorm Wind in ALBANY, NEW YORK
From 26-MAY-11 22:10:00 to 26-MAY-11 22:10:00 (EST-5)
Location: BOGHT CORNERS
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: NWS Employee

Trees and large branches were reported down on the Mohawk-Hudson Bikeway in Boght Corners due to strong thunderstorm winds.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 26-MAY-11 22:30:00 to 26-MAY-11 22:30:00 (EST-5)
Location: GREEN RIVER
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

A tree was reported down grazing a house and two large sliding barn doors were reported blown off their hinges on Dawson Road in Hillsdale due to strong thunderstorm winds.

Hail in HAMILTON, NEW YORK
From 26-MAY-11 15:15:00 to 26-MAY-11 15:20:00 (EST-5)
Location: WELLS
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Public

Penny size hail was reported in Wells during a thunderstorm.

Hail in SCHOHARIE, NEW YORK
From 26-MAY-11 15:15:00 to 26-MAY-11 15:20:00 (EST-5)
Location: CARLISLE
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Public

Penny size hail was reported in Carlisle during a thunderstorm.

Thunderstorm Wind in ALBANY, NEW YORK
From 26-MAY-11 21:55:00 to 26-MAY-11 21:55:00 (EST-5)
Location: EAST BERNE
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Newspaper

The roof of a trailer was reported partially torn off by strong thunderstorm winds on Knox Cave Road in Knox.