A very warm and humid air mass was in place over eastern New York on Friday, July 19th. With temperatures well into the 90s, the air mass was very unstable.
A cold front was upstream of the region across the Great Lakes.  Ahead of this front, a complex of thunderstorms developed across Lake Ontario during the evening hours of July 19th.  As these thunderstorms moved eastward, they strengthened as they interacted with a lake-breeze boundary over central New York.  The thunderstorms raced eastward across the Mohawk Valley, southern Adirondacks, and Saratoga Region during the late evening hours.  Due to the quick movement of the storms and the very unstable air mass in place, the thunderstorms mainly produced damaging winds, although there was also a report of large hail and heavy rainfall, which led to a mudslide in Herkimer County.
The thunderstorms moved east of the region by midnight, ending the threat for severe weather.

Thunderstorm Wind in HERKIMER, NEW YORK
From 19-JUL-13 20:02:00 to 19-JUL-13 20:02:00 (EST-5)
Location: MOHAWK
Magnitude: 50.00 EG
Reported by: Trained Spotter

Wires were reported down as a result of thunderstorm winds in Mohawk.

Thunderstorm Wind in WARREN, NEW YORK
From 19-JUL-13 20:18:00 to 19-JUL-13 20:18:00 (EST-5)
Location: POTTERSVILLE
Magnitude: 50.00 EG
Reported by: Law Enforcement

Trees were reported down in Pottersville due to thunderstorm winds.

Flash Flood in HERKIMER, NEW YORK
From 19-JUL-13 20:10:00 to 19-JUL-13 20:45:00 (EST-5)
Location: MOHAWK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A mudslide was reported at the intersection of Route 168 and Casey Road alongside the Fulmer Creek in German Flatts due to heavy rain from thunderstorms.

Thunderstorm Wind in HERKIMER, NEW YORK
From 19-JUL-13 20:39:00 to 19-JUL-13 20:39:00 (EST-5)
Location: NORWAY
Magnitude: 50.00 EG
Reported by: Trained Spotter

Multiple trees and wires were reported down in Norway as a result of thunderstorm winds.

Thunderstorm Wind in HERKIMER, NEW YORK
From 19-JUL-13 20:25:00 to 19-JUL-13 20:25:00 (EST-5)
Location: RUSSIA
Magnitude: 50.00 EG
Reported by: Trained Spotter

Multiple trees and wires were reported down in Russia as a result of thunderstorm winds.

Thunderstorm Wind in SARATOGA, NEW YORK
From 19-JUL-13 21:07:00 to 19-JUL-13 21:07:00 (EST-5)
Location: STILLWATER
Magnitude: 55.00 EG
Reported by: Trained Spotter

Power lines were reported down in Stillwater as a result of thunderstorm winds.

Thunderstorm Wind in SARATOGA, NEW YORK
From 19-JUL-13 21:10:00 to 19-JUL-13 21:10:00 (EST-5)
Location: GANSEVOORT
Magnitude: 55.00 EG
Reported by: Social Media

Trees in Gansevoort were reported down via Facebook due to thunderstorm winds.

Thunderstorm Wind in SARATOGA, NEW YORK
From 19-JUL-13 21:12:00 to 19-JUL-13 21:12:00 (EST-5)
Location: SCHUYLERVILLE
Magnitude: 55.00 EG
Reported by: Trained Spotter

Power lines were reported down in Schuylerville as a result of thunderstorm winds.

Thunderstorm Wind in HERKIMER, NEW YORK
From 19-JUL-13 19:56:00 to 19-JUL-13 19:56:00 (EST-5)
Location: MOHAWK
Magnitude: 50.00 EG
Reported by: Trained Spotter

Trees and wires were reported down in Herkimer as a result of thunderstorm winds.

Thunderstorm Wind in HERKIMER, NEW YORK
From 19-JUL-13 20:04:00 to 19-JUL-13 20:04:00 (EST-5)
Location: DOLGEVILLE
Magnitude: 50.00 EG
Reported by: Trained Spotter

Trees were reported down in Dolgeville as a result of thunderstorm winds.

Hail in HERKIMER, NEW YORK
From 19-JUL-13 20:10:00 to 19-JUL-13 20:10:00 (EST-5)
Location: EAST FRANKFORT
Magnitude: 1.00 
Reported by: Public

Quarter size hail was reported in North Columbia during a thunderstorm.

Thunderstorm Wind in HERKIMER, NEW YORK
From 19-JUL-13 20:40:00 to 19-JUL-13 20:40:00 (EST-5)
Location: MIDDLEFIELD
Magnitude: 50.00 EG
Reported by: Trained Spotter

Multiple trees and wires were reported down in Newport as a result of thunderstorm winds.

Thunderstorm Wind in SARATOGA, NEW YORK
From 19-JUL-13 21:00:00 to 19-JUL-13 21:00:00 (EST-5)
Location: WILTON
Magnitude: 55.00 EG
Reported by: Social Media

Trees and wires were reported down in Wilton via Facebook as a result of thunderstorm winds.

Thunderstorm Wind in WASHINGTON, NEW YORK
From 19-JUL-13 21:15:00 to 19-JUL-13 21:15:00 (EST-5)
Location: ARGYLE
Magnitude: 55.00 EG
Reported by: Law Enforcement

Multiple trees were reported down in Argyle as a result of thunderstorm winds.

Thunderstorm Wind in WASHINGTON, NEW YORK
From 19-JUL-13 21:15:00 to 19-JUL-13 21:15:00 (EST-5)
Location: GREENWICH
Magnitude: 55.00 EG
Reported by: Law Enforcement

Multiple trees were reported down in Greenwich as a result of thunderstorm winds.

Thunderstorm Wind in SARATOGA, NEW YORK
From 19-JUL-13 20:55:00 to 19-JUL-13 20:55:00 (EST-5)
Location: SARATOGA SPGS CO ARP
Magnitude: 55.00 EG
Reported by: Trained Spotter

Trees and wires were reported down on Rock City Road in Ballston Spa as a result of thunderstorm winds.

Thunderstorm Wind in SARATOGA, NEW YORK
From 19-JUL-13 21:02:00 to 19-JUL-13 21:02:00 (EST-5)
Location: BALLSTON SPA
Magnitude: 55.00 EG
Reported by: Trained Spotter

Power lines were reported down on East High Street in Ballston Spa as a result of thunderstorm winds.

Thunderstorm Wind in FULTON, NEW YORK
From 19-JUL-13 20:30:00 to 19-JUL-13 20:30:00 (EST-5)
Location: MAYFIELD
Magnitude: 55.00 EG
Reported by: Social Media

Trees were reported down via Facebook in Mayfield due to thunderstorm winds.