The approach of an upper level low pressure system, extreme instability in place, along with a cold front approaching from the west, triggered numerous thunderstorms across eastern New York during Tuesday afternoon and evening on June 30th, some of which became severe.
In addition, some thunderstorms redeveloped over the same areas, producing flash flooding.

Thunderstorm Wind in ULSTER, NEW YORK
From 30-JUN-09 14:45:00 to 30-JUN-09 14:45:00 (EST-5)
Location: SAUGERTIES SOUTH
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

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

Thunderstorm Wind in ULSTER, NEW YORK
From 30-JUN-09 15:25:00 to 30-JUN-09 15:25:00 (EST-5)
Location: LAPALA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Trees were reported down on Ashokan Road, located approximately 3 miles east southeast of Olivebridge, due to strong thunderstorm winds.

Thunderstorm Wind in WASHINGTON, NEW YORK
From 30-JUN-09 15:47:00 to 30-JUN-09 15:47:00 (EST-5)
Location: GRANVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple trees were reported down approximately 1 miles south of Granville due to strong thunderstorm winds. In addition, damage to siding was reported at a local senior citizen home.

Thunderstorm Wind in WASHINGTON, NEW YORK
From 30-JUN-09 16:05:00 to 30-JUN-09 16:05:00 (EST-5)
Location: COMSTOCK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Multiple trees and power lines were reported down in Comstock due to strong thunderstorm winds.

Thunderstorm Wind in WASHINGTON, NEW YORK
From 30-JUN-09 16:10:00 to 30-JUN-09 16:10:00 (EST-5)
Location: WHITEHALL
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple trees were reported down in Whitehall due to strong thunderstorm winds.

Thunderstorm Wind in ULSTER, NEW YORK
From 30-JUN-09 14:20:00 to 30-JUN-09 14:20:00 (EST-5)
Location: ULSTER LNDG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and wires were reported down approximately 5 miles north northeast of Kingston due to strong thunderstorm winds.

Thunderstorm Wind in ULSTER, NEW YORK
From 30-JUN-09 14:30:00 to 30-JUN-09 14:30:00 (EST-5)
Location: EAST KINGSTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees and wires were reported down approximately 1 mile northeast of Kingston due to strong thunderstorm winds.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 30-JUN-09 14:42:00 to 30-JUN-09 14:42:00 (EST-5)
Location: PETERSBURG
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

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

Flood in ULSTER, NEW YORK
From 30-JUN-09 15:10:00 to 30-JUN-09 18:00:00 (EST-5)
Location: MARBLETOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy rainfall led to flooding, resulting in the closure of Tongore Road.

Thunderstorm Wind in SCHENECTADY, NEW YORK
From 30-JUN-09 14:45:00 to 30-JUN-09 14:45:00 (EST-5)
Location: ROTTERDAM
Magnitude: 40.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

A tree fell onto the side of a house on Vischer Avenue in Schenectady due to strong thunderstorm winds.

Hail in FULTON, NEW YORK
From 30-JUN-09 13:07:00 to 30-JUN-09 13:12:00 (EST-5)
Location: CAROGA LAKE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail was reported in Caroga Lake during a thunderstorm.

Hail in WASHINGTON, NEW YORK
From 30-JUN-09 13:30:00 to 30-JUN-09 13:35:00 (EST-5)
Location: PUTNAM
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Penny size hail was reported in Putnam during a thunderstorm.

Hail in ULSTER, NEW YORK
From 30-JUN-09 14:20:00 to 30-JUN-09 14:25:00 (EST-5)
Location: KINGSTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was reported in Kingston during a thunderstorm.

Hail in SARATOGA, NEW YORK
From 30-JUN-09 14:48:00 to 30-JUN-09 14:53:00 (EST-5)
Location: GANSEVOORT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny size hail was reported in Gansevoort during a thunderstorm.

Hail in ULSTER, NEW YORK
From 30-JUN-09 14:25:00 to 30-JUN-09 14:31:00 (EST-5)
Location: LAKE KATRINE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny to nickel size hail was reported near Lake Katrine during a thunderstorm. Initially, penny size hail was reported, then nickel size hail was reported at 1431 LST.

Thunderstorm Wind in WARREN, NEW YORK
From 30-JUN-09 14:56:00 to 30-JUN-09 15:00:00 (EST-5)
Location: GLEN LAKE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and power lines were reported down in Queensbury due to strong thunderstorm winds. Trees were also reported down on Sunnyside Road East near Queensbury.

Flash Flood in MONTGOMERY, NEW YORK
From 30-JUN-09 14:05:00 to 30-JUN-09 16:00:00 (EST-5)
Location: CANAJOHARIE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

State Route 10 near Palatine Bridge was closed due to flash flooding. In addition, rushing floodwaters blasted out the basement windows of the United Methodist Church on Main Street in Canajoharie, inundating the basement with at least 8 inches of water.
Flood water also filled sewers that carry a steam line between the Beech Nut plant on Church Street and the Richardson Brands buildings on both sides of Erie Boulevard, which resulted in a minor rupture of a pipe at the Richardson Brands plant.
Furthermore, a small creek overflowed its banks along Happy Hollow Road near Fort Plain, resulting in the erosion of nearly 4 feet of earth from beneath the foundation of a garage.

Hail in MONTGOMERY, NEW YORK
From 30-JUN-09 12:23:00 to 30-JUN-09 12:28:00 (EST-5)
Location: ST JOHNSVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Quarter size hail was reported on St. Johnsville during a thunderstorm.

Hail in SCHENECTADY, NEW YORK
From 30-JUN-09 14:45:00 to 30-JUN-09 14:50:00 (EST-5)
Location: SCHENECTADY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Penny size hail was reported in Schenectady during a thunderstorm.

Thunderstorm Wind in ULSTER, NEW YORK
From 30-JUN-09 15:25:00 to 30-JUN-09 15:25:00 (EST-5)
Location: LAPALA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Trees were reported down on Ashokan Road, located approximately 3 miles east southeast of Olivebridge, due to strong thunderstorm winds.