With a warm front draped across northern New York and a cold front to the west, New York State was entrenched in the warm and moist warm sector as temperatures rose well into the 80s with dewpoints in the 60s during the afternoon.  Showers and thunderstorms developed out ahead of the approaching cold front, with many storms becoming severe and producing large hail and damaging winds.

Hail in DELAWARE, NEW YORK
From 29-MAY-12 15:00:00 to 29-MAY-12 15:00:00 (EST-5)
Location: FLEISCHMANNS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

One inch diameter hail fell in Fleishmans, near Andes.

Hail in ONEIDA, NEW YORK
From 29-MAY-12 13:00:00 to 29-MAY-12 13:00:00 (EST-5)
Location: BOONVILLE
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ONEIDA, NEW YORK
From 29-MAY-12 13:00:00 to 29-MAY-12 13:00:00 (EST-5)
Location: BOONVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ONONDAGA, NEW YORK
From 29-MAY-12 13:10:00 to 29-MAY-12 13:10:00 (EST-5)
Location: MEMPHIS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A storm spotter estimated winds of almost 60 mph.

Thunderstorm Wind in ONONDAGA, NEW YORK
From 29-MAY-12 13:10:00 to 29-MAY-12 13:10:00 (EST-5)
Location: JORDAN
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tree and a fence were blown down.

Thunderstorm Wind in SENECA, NEW YORK
From 29-MAY-12 13:00:00 to 29-MAY-12 13:00:00 (EST-5)
Location: SENECA FALLS
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were blown down in both Seneca Falls and Waterloo.

Thunderstorm Wind in BROOME, NEW YORK
From 29-MAY-12 14:30:00 to 29-MAY-12 14:30:00 (EST-5)
Location: WHITNEY PT
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was blown down across I-81 at exit 8.

Thunderstorm Wind in BROOME, NEW YORK
From 29-MAY-12 14:31:00 to 29-MAY-12 14:31:00 (EST-5)
Location: LISLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees and power lines were blown down.

Thunderstorm Wind in CHENANGO, NEW YORK
From 29-MAY-12 14:45:00 to 29-MAY-12 14:45:00 (EST-5)
Location: SMITHVILLE FLATS
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Four large trees were blown down in the area.

Hail in BROOME, NEW YORK
From 29-MAY-12 15:05:00 to 29-MAY-12 15:05:00 (EST-5)
Location: ENDWELL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in BROOME, NEW YORK
From 29-MAY-12 15:16:00 to 29-MAY-12 15:16:00 (EST-5)
Location: BROADACRES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm Wind in SULLIVAN, NEW YORK
From 29-MAY-12 14:45:00 to 29-MAY-12 14:45:00 (EST-5)
Location: LIBERTY
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were blown down.

Thunderstorm Wind in TIOGA, NEW YORK
From 29-MAY-12 16:02:00 to 29-MAY-12 16:02:00 (EST-5)
Location: LITCHFIELD
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were blown down.

Hail in DELAWARE, NEW YORK
From 29-MAY-12 16:07:00 to 29-MAY-12 16:07:00 (EST-5)
Location: WALTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DELAWARE, NEW YORK
From 29-MAY-12 16:15:00 to 29-MAY-12 16:15:00 (EST-5)
Location: DELHI
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CHENANGO, NEW YORK
From 29-MAY-12 14:50:00 to 29-MAY-12 14:50:00 (EST-5)
Location: SHERBURNE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in YATES, NEW YORK
From 29-MAY-12 13:45:00 to 29-MAY-12 13:45:00 (EST-5)
Location: LAKEMONT
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Several trees were blown down.

Thunderstorm Wind in SULLIVAN, NEW YORK
From 29-MAY-12 16:32:00 to 29-MAY-12 16:32:00 (EST-5)
Location: MONTICELLO
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees were blown down.

Thunderstorm Wind in CHEMUNG, NEW YORK
From 29-MAY-12 13:45:00 to 29-MAY-12 13:45:00 (EST-5)
Location: ERIN
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was blown down, blocking the road at the intersection of Marsh and Wyncoop Creek Roads.

Thunderstorm Wind in SULLIVAN, NEW YORK
From 29-MAY-12 17:00:00 to 29-MAY-12 17:00:00 (EST-5)
Location: LOWES CORNERS
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees and wires were blown down.

Hail in DELAWARE, NEW YORK
From 29-MAY-12 16:14:00 to 29-MAY-12 16:14:00 (EST-5)
Location: DELHI
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in SENECA, NEW YORK
From 29-MAY-12 12:27:00 to 29-MAY-12 12:27:00 (EST-5)
Location: ROSE HILL
Magnitude: 78.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The path of the storm started along route 96A in the town of Fayette, just east of Seneca Lake. Here a barn was destroyed with estimated wind speeds of 80 to 90 mph. Scattered damage continued to the northeast through the town of Fayette across route 96 near Christler Road. Here a tractor trailer was blown off the road as
it was traveling along route 96. This is where the 1 injury occurred. Partial roof damage was noted to a barn, with significant hail damage to the west side of a house due to the high wind speeds. Estimated wind speeds in this area were between 70 and 80 mph.
A scattered path of damage continued northeast through Seneca Falls and across Cayuga Lake into the town of Aurelius. Numerous tree branches were down throughout these areas with winds generally around 60 mph. Just east of Cayuga Lake in the town of Aurelius, along route 90, some isolated areas had uprooted trees. In these areas, wind speeds were estimated to be between 70 and 80 mph.
The pattern of damage was consistent with a microburst in that the damage of the trees was layed out in a divergent or a fan shaped pattern.

Thunderstorm Wind in SENECA, NEW YORK
From 29-MAY-12 12:41:00 to 29-MAY-12 12:41:00 (EST-5)
Location: SENECA FALLS
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Numerous trees and branches were down around the city. One large tree was uprooted on State Street.

Hail in ONEIDA, NEW YORK
From 29-MAY-12 13:30:00 to 29-MAY-12 13:30:00 (EST-5)
Location: ALDER CREEK
Magnitude: 1.75 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

The hail broke a windshield and dented a car.

Hail in YATES, NEW YORK
From 29-MAY-12 11:48:00 to 29-MAY-12 11:48:00 (EST-5)
Location: VINE VLY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONONDAGA, NEW YORK
From 29-MAY-12 12:31:00 to 29-MAY-12 12:31:00 (EST-5)
Location: BREWERTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STEUBEN, NEW YORK
From 29-MAY-12 12:33:00 to 29-MAY-12 12:33:00 (EST-5)
Location: CORNING
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STEUBEN, NEW YORK
From 29-MAY-12 12:40:00 to 29-MAY-12 12:40:00 (EST-5)
Location: GIBSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONEIDA, NEW YORK
From 29-MAY-12 13:00:00 to 29-MAY-12 13:00:00 (EST-5)
Location: FORESTPORT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SENECA, NEW YORK
From 29-MAY-12 12:31:00 to 29-MAY-12 12:31:00 (EST-5)
Location: WATERLOO
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONEIDA, NEW YORK
From 29-MAY-12 12:55:00 to 29-MAY-12 12:55:00 (EST-5)
Location: DUNN BROOK
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ONONDAGA, NEW YORK
From 29-MAY-12 13:15:00 to 29-MAY-12 13:15:00 (EST-5)
Location: LEWISTON MANOR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ONEIDA, NEW YORK
From 29-MAY-12 12:35:00 to 29-MAY-12 12:35:00 (EST-5)
Location: AVA
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MADISON, NEW YORK
From 29-MAY-12 14:10:00 to 29-MAY-12 14:10:00 (EST-5)
Location: STOCKBRIDGE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ONEIDA, NEW YORK
From 29-MAY-12 14:38:00 to 29-MAY-12 14:38:00 (EST-5)
Location: CLINTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CHENANGO, NEW YORK
From 29-MAY-12 14:40:00 to 29-MAY-12 14:40:00 (EST-5)
Location: SHERBURNE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ONONDAGA, NEW YORK
From 29-MAY-12 13:30:00 to 29-MAY-12 13:30:00 (EST-5)
Location: TULLY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter estimated winds of nearly 60 mph.

Thunderstorm Wind in TIOGA, NEW YORK
From 29-MAY-12 14:25:00 to 29-MAY-12 14:25:00 (EST-5)
Location: WEST NEWARK
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees and wires were blown down.

Hail in CHENANGO, NEW YORK
From 29-MAY-12 15:22:00 to 29-MAY-12 15:22:00 (EST-5)
Location: NEW BERLIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CAYUGA, NEW YORK
From 29-MAY-12 13:33:00 to 29-MAY-12 13:33:00 (EST-5)
Location: SEMPRONIUS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public