The region was sandwiched between a strong stalled upper level low over the Ohio Valley and a ridge of high pressure situated over the western Atlantic Ocean.  The combined flow around both of these feature allowed a moist southerly flow directly out of the Caribbean Sea to move up the eastern seaboard.   Showers and thunderstorms developed along a very slow moving surface boundary and the persistent southerly flow caused a lot of these showers and thunderstorms to develop and pass over the same areas.
Due to heavy rainfall over the last month, the ground was rather saturated and it didn't take much additional rain to cause issues.  As a result, flash flooding occurred throughout the day on Monday, July 1st and again during the evening on Tuesday, July 2nd.  Roads were damaged and closed and some evacuations took place as homes were impacted by the flood waters.  The hardest hit areas were across part of the Mohawk Valley, where significant flash flooding had occurred just a few days prior.

Flash Flood in HERKIMER, NEW YORK
From 01-JUL-13 19:04:00 to 02-JUL-13 01:05:00 (EST-5)
Location: MIDDLEFIELD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The river gage at Kast Bridge recorded flash flooding as a result of heavy rainfall. The river gage crested at 7.85 feet at 9:30 PM EST, which is considered moderate flooding. The river gage at Kast Bridge is located along on the right bank of the West Canada Creek 600 feet downstream from a bridge on old State Highway 28 at Kast Bridge, 1.2 miles downstream from North Creek, 2.2 miles north of Herkimer, and 4.0 miles upstream from the river's mouth at the Mohawk River.

Flash Flood in SARATOGA, NEW YORK
From 02-JUL-13 18:45:00 to 02-JUL-13 20:30:00 (EST-5)
Location: SARATOGA SPGS CO ARP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Vichy Drive in Saratoga Springs was closed due to flash flooding from heavy rainfall.

Flash Flood in ULSTER, NEW YORK
From 01-JUL-13 07:00:00 to 01-JUL-13 11:15:00 (EST-5)
Location: SPRINGTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Springtown Road near New Paltz was closed due to flash flooding from heavy rainfall.

Flash Flood in DUTCHESS, NEW YORK
From 01-JUL-13 08:15:00 to 01-JUL-13 11:54:00 (EST-5)
Location: EAST PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

The intersection of Crum Elbow Road and Cardinal Road in Hyde Park was closed due to flash flooding from heavy rainfall.

Flash Flood in HERKIMER, NEW YORK
From 01-JUL-13 18:15:00 to 01-JUL-13 21:30:00 (EST-5)
Location: EAST FRANKFORT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple roads were closed throughout Ilion due to flash flooding from heavy rainfall.  Areas along the Steele Creek were impacted the most.

Flash Flood in HERKIMER, NEW YORK
From 01-JUL-13 18:15:00 to 01-JUL-13 21:30:00 (EST-5)
Location: ILION
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

New York State Route 5S in Mohawk was closed as a result of flash flooding from heavy rainfall.

Flash Flood in HERKIMER, NEW YORK
From 01-JUL-13 18:15:00 to 01-JUL-13 21:30:00 (EST-5)
Location: EAST SCHUYLER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Roads throughout Frankfort were closed to flash flooding from heavy rainfall.  Evacuations had to take place, as some homes were impacted by flood waters.

Flash Flood in MONTGOMERY, NEW YORK
From 01-JUL-13 18:45:00 to 02-JUL-13 00:45:00 (EST-5)
Location: FT PLAIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Significant flash flooding occurred throughout Fort Plain as a result of heavy rainfall.  The Otsquago Creek rose over its banks and impacted a section of Route 80.  Multiple roads were washed out and closed and evacuations took place, as homes were impacted by the flood waters.

Flash Flood in HERKIMER, NEW YORK
From 01-JUL-13 18:15:00 to 01-JUL-13 21:30:00 (EST-5)
Location: EATONVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Flash flooding was reported in the town of Fairfield along Davis Road and Route 169 due to heavy rainfall.  The intersection was closed as a result of the flooding.

Flash Flood in HERKIMER, NEW YORK
From 01-JUL-13 18:45:00 to 01-JUL-13 21:30:00 (EST-5)
Location: INDIAN CASTLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

New York State Route 5S in Danube was closed as a result of flash flooding from heavy rainfall from Herkimer County Route 169 to Herkimer County Route 213.

Flash Flood in SARATOGA, NEW YORK
From 02-JUL-13 18:21:00 to 02-JUL-13 20:30:00 (EST-5)
Location: BALLSTON SPA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Saratoga Avenue at Union Street in Ballston Spa was closed due to flash flooding from heavy rain.

Flash Flood in SARATOGA, NEW YORK
From 02-JUL-13 18:31:00 to 02-JUL-13 20:30:00 (EST-5)
Location: SARATOGA SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Television media reported on their Facebook page that over six inches of water was spilling over the top of manhole covers in downtown Saratoga Springs as a result of heavy rainfall.

Flash Flood in SARATOGA, NEW YORK
From 02-JUL-13 18:45:00 to 02-JUL-13 20:30:00 (EST-5)
Location: WILTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A section of Parkhurst Road in Wilton was reportedly washed out due to flash flooding from heavy rainfall.

Flash Flood in SARATOGA, NEW YORK
From 02-JUL-13 19:05:00 to 02-JUL-13 20:30:00 (EST-5)
Location: SARATOGA LAKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Fitch Road in Saratoga Lake was washed out and closed due to flash flooding from heavy rainfall. Houses at the intersection of Route 9P and Fitch Road were impacted by the flood waters.

Flash Flood in DUTCHESS, NEW YORK
From 01-JUL-13 08:30:00 to 01-JUL-13 11:54:00 (EST-5)
Location: SCHULTZVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Three houses on Blue Heron Lane in the town of Clinton were impacted by flash flooding from heavy rainfall.

Flash Flood in SARATOGA, NEW YORK
From 02-JUL-13 18:45:00 to 02-JUL-13 20:30:00 (EST-5)
Location: SARATOGA SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Both Clinton Street and Caroline Street in Saratoga Springs were closed due to flash flooding from heavy rainfall.

Flash Flood in COLUMBIA, NEW YORK
From 01-JUL-13 10:00:00 to 01-JUL-13 13:00:00 (EST-5)
Location: ANCRAMDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Skyline Drive near Ancramdale was closed as a result of flash flooding from heavy rainfall.

Flash Flood in COLUMBIA, NEW YORK
From 01-JUL-13 10:00:00 to 01-JUL-13 13:00:00 (EST-5)
Location: ANCRAMDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Finkle Road, two miles east of Pachin Mills, was reportedly washed out and closed as a result of flash flooding from heavy rainfall.

Flash Flood in HERKIMER, NEW YORK
From 01-JUL-13 18:15:00 to 02-JUL-13 00:15:00 (EST-5)
Location: MOHAWK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash flooding occurred throughout the village of Herkimer as a result of heavy rainfall. Graham street, North Bellinger and Prospect streets were all closed as a result of the flooding.   Evacuations took place as some of the flooding impacted homes.  A mudslide was reported within the town as well.

Flash Flood in ULSTER, NEW YORK
From 01-JUL-13 07:00:00 to 01-JUL-13 11:15:00 (EST-5)
Location: COTTEKILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

The intersection of Route 32 and Washington Avenue in Rosendale was closed as a result of flash flooding from heavy rainfall.

Flash Flood in MONTGOMERY, NEW YORK
From 01-JUL-13 18:45:00 to 02-JUL-13 00:45:00 (EST-5)
Location: CANAJOHARIE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A large section of New York State Route 5 from Palatine Bridge to Fonda was closed as a result of flash flooding from heavy rainfall.