The combination of a passing upper level trough, and unusually cold air in the mid and upper levels of the atmosphere, led to the development of numerous thunderstorms across eastern New York during the late morning into the early evening hours on Monday June 15th, many of which contained large quantities of hail. The thunderstorms developed during the late morning hours, and continued through early evening.
In addition, some thunderstorms were slow moving, and produced locally very intense rainfall rates. This led to flash flooding in some areas.

Hail in COLUMBIA, NEW YORK
From 15-JUN-09 18:17:00 to 15-JUN-09 18:21:00 (EST-5)
Location: KINDERHOOK
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail was reported in Kinderhook during a thunderstorm. In addition, a peak wind gust of 41 mph was measured.

Hail in ALBANY, NEW YORK
From 15-JUN-09 18:15:00 to 15-JUN-09 18:15:00 (EST-5)
Location: COEYMANS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny size hail was reported in Ravena during a thunderstorm.

Hail in COLUMBIA, NEW YORK
From 15-JUN-09 18:20:00 to 15-JUN-09 18:23:00 (EST-5)
Location: VALATIE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail was reported in Valatie during a thunderstorm.

Hail in COLUMBIA, NEW YORK
From 15-JUN-09 18:42:00 to 15-JUN-09 18:47:00 (EST-5)
Location: CHATHAM CENTER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A mixture of pea to penny size hail was reported in Chatham Center during a thunderstorm.

Hail in ULSTER, NEW YORK
From 15-JUN-09 11:44:00 to 15-JUN-09 11:49:00 (EST-5)
Location: KERHONKSON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail was reported in Kerhonkson during a thunderstorm.

Flash Flood in WASHINGTON, NEW YORK
From 15-JUN-09 13:15:00 to 15-JUN-09 16:00:00 (EST-5)
Location: PUTNAM
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

County Route 2 was closed due to flooding in the Town of Putnam. The road was washed out in three places within the town.

Hail in SARATOGA, NEW YORK
From 15-JUN-09 13:20:00 to 15-JUN-09 13:25:00 (EST-5)
Location: SARATOGA SPGS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny size hail was reported in Saratoga Springs during a thunderstorm.

Hail in ALBANY, NEW YORK
From 15-JUN-09 17:35:00 to 15-JUN-09 17:38:00 (EST-5)
Location: ELSMERE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Quarter size hail was reported near Buckingham Pond in Albany during a thunderstorm.

Hail in ALBANY, NEW YORK
From 15-JUN-09 17:32:00 to 15-JUN-09 17:37:00 (EST-5)
Location: COLONIE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was reported in Colonie during a thunderstorm.

Hail in ALBANY, NEW YORK
From 15-JUN-09 18:05:00 to 15-JUN-09 18:08:00 (EST-5)
Location: COEYMANS HOLLOW
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Golf ball size hail was reported in Coeymans Hollow during a thunderstorm.

Hail in SARATOGA, NEW YORK
From 15-JUN-09 15:12:00 to 15-JUN-09 15:17:00 (EST-5)
Location: PALMER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Quarter size hail was reported in Corinth during a thunderstorm.

Hail in SARATOGA, NEW YORK
From 15-JUN-09 16:15:00 to 15-JUN-09 16:20:00 (EST-5)
Location: GALWAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Penny to quarter size hail was reported on Galway Lake during a thunderstorm.

Hail in SARATOGA, NEW YORK
From 15-JUN-09 16:40:00 to 15-JUN-09 16:45:00 (EST-5)
Location: CHARLTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail was reported in Charlton during a thunderstorm. The hail was covering the ground.

Thunderstorm Wind in SARATOGA, NEW YORK
From 15-JUN-09 16:41:00 to 15-JUN-09 16:41:00 (EST-5)
Location: GALWAY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

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

Hail in SARATOGA, NEW YORK
From 15-JUN-09 17:00:00 to 15-JUN-09 17:05:00 (EST-5)
Location: REXFORD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny size hail was reported in Rexford during a thunderstorm.

Hail in ALBANY, NEW YORK
From 15-JUN-09 17:10:00 to 15-JUN-09 17:14:00 (EST-5)
Location: HARTMANS CORNERS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny to quarter size hail was reported near and within Guilderland during a thunderstorm. The hail accumulated up to two inches in depth in some areas.

Hail in ALBANY, NEW YORK
From 15-JUN-09 17:20:00 to 15-JUN-09 17:25:00 (EST-5)
Location: WESTMERE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Golf ball size hail was reported in Guilderland during a thunderstorm.

Hail in ALBANY, NEW YORK
From 15-JUN-09 17:25:00 to 15-JUN-09 17:30:00 (EST-5)
Location: NORTH BETHLEHEM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny to quarter size hail was reported in North Bethlehem and at the NWS Albany Office on the campus of the University of Albany during a thunderstorm.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 15-JUN-09 18:05:00 to 15-JUN-09 18:05:00 (EST-5)
Location: EAST GREENBUSH
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wires were reported down on Mannix Road in East Greenbush due to strong thunderstom winds. In addition, a tree was also reported down in Brunswick at approximately 1740 LST due to strong thunderstorm winds.

Hail in SCHENECTADY, NEW YORK
From 15-JUN-09 16:45:00 to 15-JUN-09 16:50:00 (EST-5)
Location: GLENVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny to quarter size hail was reported in Glenville, East Glenville and Scotia during a thunderstorm.

Hail in SCHENECTADY, NEW YORK
From 15-JUN-09 17:02:00 to 15-JUN-09 17:07:00 (EST-5)
Location: AQUEDUCT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Nickel size hail was reported in Niskayuna during a thunderstorm.

Hail in ALBANY, NEW YORK
From 15-JUN-09 17:25:00 to 15-JUN-09 17:30:00 (EST-5)
Location: COHOES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was reported in Cohoes during a thunderstorm.

Hail in ULSTER, NEW YORK
From 15-JUN-09 13:36:00 to 15-JUN-09 13:41:00 (EST-5)
Location: CRAGSMOOR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel to quarter size hail was reported in Cragsmoor during a thunderstorm.

Hail in SARATOGA, NEW YORK
From 15-JUN-09 13:40:00 to 15-JUN-09 13:45:00 (EST-5)
Location: SARATOGA SPGS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny size hail was reported in Saratoga Springs during a thunderstorm.

Hail in ULSTER, NEW YORK
From 15-JUN-09 13:50:00 to 15-JUN-09 13:55:00 (EST-5)
Location: DWAAR KILL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail was reported in Awosting during a thunderstorm.

Hail in ULSTER, NEW YORK
From 15-JUN-09 13:55:00 to 15-JUN-09 14:00:00 (EST-5)
Location: DWAAR KILL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail was reported approximately 5 miles north of Pine Bush during a thunderstorm.

Hail in ULSTER, NEW YORK
From 15-JUN-09 11:10:00 to 15-JUN-09 11:15:00 (EST-5)
Location: KERHONKSON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail was reported in Kerhonkson during a thunderstorm.

Hail in MONTGOMERY, NEW YORK
From 15-JUN-09 16:00:00 to 15-JUN-09 16:05:00 (EST-5)
Location: AMES
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail was reported in Ames during a thunderstorm.