An upper level low pressure system moved slowly northeast from central Pennsylvania into east central New York State during Monday, August 11th. The upper level dynamics of this system, combined with abundant low level moisture, and significant instability led to the development of numerous, slow moving thunderstorm clusters during Monday afternoon. Large hail was reported with many of these thunderstorms.
In addition, locally very heavy rainfall resulted in flash flooding in portions of eastern New York.

Hail in RENSSELAER, NEW YORK
From 11-AUG-08 13:29:00 to 11-AUG-08 13:29:00 (EST-5)
Location: SYCAWAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported in Troy during a thunderstorm.

Hail in ALBANY, NEW YORK
From 11-AUG-08 13:40:00 to 11-AUG-08 13:51:00 (EST-5)
Location: WATERVLIET
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny to quarter size hail was reported in Watervliet during a thunderstorm.

Hail in RENSSELAER, NEW YORK
From 11-AUG-08 13:51:00 to 11-AUG-08 13:51:00 (EST-5)
Location: SYCAWAY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail was reported in Troy during a thunderstorm.

Lightning in COLUMBIA, NEW YORK
From 11-AUG-08 02:00:00 to 11-AUG-08 02:00:00 (EST-5)
Location: BLUE STORES
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck a tree on Route 9 near Blue Stores at approximately 0200 LST. The tree exploded, sending debris through portions of one home, and over 200 feet onto the lawn of a neighbor.
The debris smashed the windows and windshield of one vehicle, damaged another vehicle, broke the window of a home, and also smashed an outdoor picnic table.

Hail in DUTCHESS, NEW YORK
From 11-AUG-08 11:19:00 to 11-AUG-08 11:19:00 (EST-5)
Location: MATTEAWAN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail was reported in Beacon during a thunderstorm.

Hail in DUTCHESS, NEW YORK
From 11-AUG-08 11:45:00 to 11-AUG-08 11:45:00 (EST-5)
Location: WAPPINGERS FALLS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny size hail was reported in Wappingers Falls during a thunderstorm.

Hail in RENSSELAER, NEW YORK
From 11-AUG-08 12:48:00 to 11-AUG-08 12:48:00 (EST-5)
Location: EAST SCHODACK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail was reported near East Schodack during a thunderstorm.

Flash Flood in DUTCHESS, NEW YORK
From 11-AUG-08 13:06:00 to 11-AUG-08 14:06:00 (EST-5)
Location: FAIRVIEW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several basements were flooded approximately 2 miles north of Poughkeepsie due to flash flooding from heavy rainfall.

Hail in RENSSELAER, NEW YORK
From 11-AUG-08 13:21:00 to 11-AUG-08 13:21:00 (EST-5)
Location: WYNANTSKILL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail fell in Wynantskill during a thunderstorm.

Flash Flood in RENSSELAER, NEW YORK
From 11-AUG-08 14:15:00 to 11-AUG-08 18:15:00 (EST-5)
Location: MELROSE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash flooding resulted in the closure of Route 40 from Pinewoods Road to Melrose Valley Falls Road in Melrose.

Flash Flood in COLUMBIA, NEW YORK
From 11-AUG-08 13:12:00 to 11-AUG-08 18:40:00 (EST-5)
Location: CHATHAM
Flood cause: Heavy Rain
Property damage: 45.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several roads were closed in various portions of Columbia County due to flash flooding from very heavy rainfall.
In Hillsdale, Rodman, Wolf Hill, and Pumpkin Roads were closed due to significant flooding. A high volume of water, seven feet deep and backed up over a 20 acre swamp, was believed to have burst from a beaver dam, sending a cascade of water down Wolf Hill Road.
In addition, School Street in Chatham was also closed due to flooding.

Flash Flood in HERKIMER, NEW YORK
From 11-AUG-08 18:35:00 to 11-AUG-08 20:45:00 (EST-5)
Location: MIDDLEVILLE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Flash flooding resulted from very heavy rainfall in Middleville. Flooding was reported at the intersection of State Routes 169 and 29 at the intersection of Route 28 in Middleville.  Some of this flooding was attributed to nearby Bridenbecker Creek flowing out of its banks.
In addition, three homes on South Main Street, and two on Bridge Street experienced basement flooding.

Flash Flood in RENSSELAER, NEW YORK
From 11-AUG-08 13:00:00 to 11-AUG-08 18:40:00 (EST-5)
Location: RENSSELAER
Flood cause: Heavy Rain
Property damage: 4.00M
Crop damage: 0.00K
Reported by: Emergency Manager

Very heavy rainfall from training thunderstorms led to significant urban and small stream flash flooding in and near the City of Rensselaer. A State of Emergency was declared in the City of Rensselaer as numerous roads were closed, with 6 or more feet of standing water reported on city streets. Evacuations of 50 to 75 homes occurred due to the flooding. Flooding was mainly concentrated along and near the banks of Quackenberry Creek, as well as near Mill Creek.
The Amtrak Station in Rensselaer was also closed due to the flooding.
Flash flooding also closed Routes 9 and 20, a portion of Route 151, and Luther Road, in East Greenbush.

Flash Flood in ALBANY, NEW YORK
From 11-AUG-08 14:00:00 to 11-AUG-08 18:15:00 (EST-5)
Location: NEWTONVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash flooding caused water to overflow on East Hills Road in Loudonville, approximately 300 yards south of Route 155.

Flash Flood in MONTGOMERY, NEW YORK
From 11-AUG-08 12:03:00 to 11-AUG-08 17:00:00 (EST-5)
Location: GLEN
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several roads were closed across Montgomery County due to flash flooding from very heavy rainfall. Some of the roads that were closed included, but were not limited to, Logtown Road and Van Epps Road near Glen.
In addition, a minor mud slide occurred at the intersection of Route 5 and Switzer Hill Road just east of Fonda, after a culvert underneath Route 5 was inundated.