A cold front moved into western New York and Pennsylvania Tuesday afternoon, and showers and thunderstorms quickly developed along and ahead of the front. The front slowly moved east and propagated into a very unstable environment. As the front moved east,  supercells developed ahead of the approaching front. As these storms moved east, some of these storms produced damaging winds and large hail.

Hail in CORTLAND, NEW YORK
From 12-AUG-17 14:49:00 to 12-AUG-17 14:59:00 (EST-5)
Location: CINCINNATUS
Magnitude: 1.00 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm developed over the area and produced dime to quarter sized hail.

Hail in MADISON, NEW YORK
From 12-AUG-17 15:20:00 to 12-AUG-17 15:30:00 (EST-5)
Location: PETERBORO
Magnitude: 1.25 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm developed over the area and produced half dollar sized hail.

Hail in MADISON, NEW YORK
From 12-AUG-17 15:26:00 to 12-AUG-17 15:36:00 (EST-5)
Location: STOCKBRIDGE
Magnitude: 1.50 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A thunderstorm developed over the area and produced walnut sized hail.

Thunderstorm Wind in CHENANGO, NEW YORK
From 12-AUG-17 15:00:00 to 12-AUG-17 15:10:00 (EST-5)
Location: MC DONOUGH
Magnitude: 65.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: State Official

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over multiple trees blocking the road at State Park.

Thunderstorm Wind in OTSEGO, NEW YORK
From 12-AUG-17 15:42:00 to 12-AUG-17 15:52:00 (EST-5)
Location: MORRIS
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.

Thunderstorm Wind in ONEIDA, NEW YORK
From 12-AUG-17 14:10:00 to 12-AUG-17 14:20:00 (EST-5)
Location: WESTDALE
Magnitude: 70.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and uprooted multiple trees and forced down many power lines. This storm also knocked over many camp sites and boats. This storm created damage at the Sto-Ne-Nols Campground.

Thunderstorm Wind in OTSEGO, NEW YORK
From 12-AUG-17 14:18:00 to 12-AUG-17 14:28:00 (EST-5)
Location: COOPERSTOWN
Magnitude: 55.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: State Official

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.

Thunderstorm Wind in CHENANGO, NEW YORK
From 12-AUG-17 15:15:00 to 12-AUG-17 15:25:00 (EST-5)
Location: NORWICH
Magnitude: 65.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over several trees in the area.

Thunderstorm Wind in OTSEGO, NEW YORK
From 12-AUG-17 16:06:00 to 12-AUG-17 16:16:00 (EST-5)
Location: LAURENS
Magnitude: 70.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over numerous trees and wires.

Thunderstorm Wind in OTSEGO, NEW YORK
From 12-AUG-17 16:12:00 to 12-AUG-17 16:22:00 (EST-5)
Location: MILFORD
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.

Thunderstorm Wind in OTSEGO, NEW YORK
From 12-AUG-17 16:25:00 to 12-AUG-17 16:35:00 (EST-5)
Location: WORCESTER
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.

Thunderstorm Wind in OTSEGO, NEW YORK
From 12-AUG-17 16:30:00 to 12-AUG-17 16:40:00 (EST-5)
Location: WORCESTER
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: State Official

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and wires.

Thunderstorm Wind in OTSEGO, NEW YORK
From 12-AUG-17 16:30:00 to 12-AUG-17 16:40:00 (EST-5)
Location: EAST WORCESTER
Magnitude: 70.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over numerous trees and wires. This region took the brunt of the storm.