During the day on Sunday, July 7th, a warm, southerly flow around a Bermuda High Pressure area allowed plenty of moisture to stream into eastern New York.  This allowed for an unstable air mass to be in place across the region.  As an upper level shortwave moved from the Ohio Valley towards the Northeast, scattered thunderstorms developed during the afternoon and evening hours.  A few of these thunderstorms became severe, producing large hail and damaging winds.  Hail reached the size of golf balls across portions of Columbia County.  During one of the thunderstorms, a man was struck by lightning on a lake beach at a state park in Columbia County.  He went to cardiac arrest, and later died.
In addition, the very moist air mass allowed these thunderstorms to produce very heavy rainfall in a short period of time.  This led to flash flooding in a few locations, including portions of the Mohawk Valley that were still cleaning up from flash flooding earlier in the month and in late June.
Thunderstorm activity diminished by the evening hours due to the loss of daytime heating, ending the threat for additional severe storms or flash flooding.

Hail in COLUMBIA, NEW YORK
From 07-JUL-13 12:55:00 to 07-JUL-13 13:00:00 (EST-5)
Location: CANAAN
Magnitude: 1.00 
Reported by: Public

Quarter size hail was reported during a thunderstorm two miles west-northwest of Canaan.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 07-JUL-13 13:10:00 to 07-JUL-13 13:10:00 (EST-5)
Location: GALLINTINVILLE
Magnitude: 50.00 EG
Reported by: 911 Call Center

Multiple trees and wires were reported down due to thunderstorm winds in Gallatinville.

Lightning in COLUMBIA, NEW YORK
From 07-JUL-13 13:18:00 to 07-JUL-13 13:18:00 (EST-5)
Location: WEST TAGHKANIC
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A 26 year old man was struck by lightning on a beach at Lake Taghkanic State Park in Gallatin. The man was standing under a tree that was struck by lightning and the lightning traveled through this body.  He went into cardiac arrest, but was resuscitated at the park by emergency personnel.  He was then brought to a hospital in Hudson and transferred to Albany Medical Center where he later died.

Hail in COLUMBIA, NEW YORK
From 07-JUL-13 13:25:00 to 07-JUL-13 13:35:00 (EST-5)
Location: CAMP WAUBEEKA
Magnitude: 1.75 
Reported by: Social Media

Golfball size hail was reported during a thunderstorm in Copake via Facebook.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 07-JUL-13 13:41:00 to 07-JUL-13 13:41:00 (EST-5)
Location: ANCRAM
Magnitude: 50.00 EG
Reported by: Broadcast Media

Multiple trees were reported down due to thunderstorm winds in Ancram.

Hail in COLUMBIA, NEW YORK
From 07-JUL-13 13:45:00 to 07-JUL-13 13:50:00 (EST-5)
Location: COPAKE
Magnitude: 1.25 
Reported by: Public

Half dollar size hail was reported during a thunderstorm at the Ancram Ameri Store on Route 22 in Copake.

Thunderstorm Wind in MONTGOMERY, NEW YORK
From 07-JUL-13 18:55:00 to 07-JUL-13 18:55:00 (EST-5)
Location: SCOTCH BUSH
Magnitude: 50.00 EG
Reported by: Trained Spotter

A tree and wires were reported down on Route 30 due to thunderstorm winds in Scotch Bush.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 07-JUL-13 13:45:00 to 07-JUL-13 13:45:00 (EST-5)
Location: COPAKE
Magnitude: 50.00 EG
Reported by: Public

One tree was reported down due to thunderstorm winds at the Ancram Ameri Store on Route 22 in Copake.

Flash Flood in COLUMBIA, NEW YORK
From 07-JUL-13 14:46:00 to 07-JUL-13 18:38:00 (EST-5)
Location: WEST TAGHKANIC
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A large section of the Taconic State Parkway was closed due to flash flooding from heavy rainfall.  The northbound lanes were closed from Route 82 to Route 50.

Flash Flood in COLUMBIA, NEW YORK
From 07-JUL-13 14:55:00 to 07-JUL-13 18:38:00 (EST-5)
Location: TAGHKANIC
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A bridge was washed out in the town of Taghkanic due to flash flooding from heavy rainfall.

Flash Flood in HERKIMER, NEW YORK
From 07-JUL-13 20:00:00 to 08-JUL-13 00:45:00 (EST-5)
Location: LITTLE FALLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Route 5 in Little Falls was closed due to flash flooding from heavy rainfall.

Flash Flood in HERKIMER, NEW YORK
From 07-JUL-13 19:38:00 to 08-JUL-13 00:45:00 (EST-5)
Location: LITTLE FALLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple roads were closed in the city of Little Falls due to flash flooding from heavy rainfall.

Flash Flood in HERKIMER, NEW YORK
From 07-JUL-13 20:00:00 to 08-JUL-13 00:45:00 (EST-5)
Location: INDIAN CASTLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Route 5S in the town of Danube was closed due to flash flooding from heavy rainfall.

Heavy Rain in SCHENECTADY, NEW YORK
From 07-JUL-13 15:30:00 to 07-JUL-13 17:30:00 (EST-5)
Location: SCHENECTADY
Reported by: NWS Employee

A retired NWS Employee reported minor street flooding along State Street in Schenectady.