A warm front lifted north across the region Monday morning which created an unstable air mass across the state of New York and Pennsylvania. By late Monday afternoon, a cold front moved into western New York and Pennsylvania which produced a line of thunderstorms. As the thunderstorms moved east, coverage became widespread and a major severe weather outbreak ensued for central New York and northeast Pennsylvania. Some of the thunderstorms produced winds between 70 and 100 mph. Numerous trees were knocked down and there were widespread power outages some of which lasted for several days.

Thunderstorm Wind in STEUBEN, NEW YORK
From 01-MAY-17 16:20:00 to 01-MAY-17 16:30:00 (EST-5)
Location: CANISTEO
Magnitude: 55.00 EG
Property damage: 3.00K
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 power lines.

Thunderstorm Wind in CAYUGA, NEW YORK
From 01-MAY-17 17:40:00 to 01-MAY-17 17:50:00 (EST-5)
Location: MORAVIA
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

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

Thunderstorm Wind in CHEMUNG, NEW YORK
From 01-MAY-17 18:01:00 to 01-MAY-17 18:11:00 (EST-5)
Location: ELMIRA
Magnitude: 50.00 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 a tree on a house and produced structural damage.

Thunderstorm Wind in ONEIDA, NEW YORK
From 01-MAY-17 18:40:00 to 01-MAY-17 18:50:00 (EST-5)
Location: ROME
Magnitude: 55.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: State Official

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

Thunderstorm Wind in TIOGA, NEW YORK
From 01-MAY-17 18:45:00 to 01-MAY-17 18:55:00 (EST-5)
Location: OWEGO
Magnitude: 65.00 EG
Property damage: 7.00K
Crop damage: 0.00K
Reported by: Public

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

Thunderstorm Wind in BROOME, NEW YORK
From 01-MAY-17 18:47:00 to 01-MAY-17 18:57:00 (EST-5)
Location: WEST ENDICOTT
Magnitude: 55.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and power lines. This thunderstorm also hit a transformer by lightning.

Thunderstorm Wind in BROOME, NEW YORK
From 01-MAY-17 18:52:00 to 01-MAY-17 19:02:00 (EST-5)
Location: VESTAL
Magnitude: 55.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and power lines near Four Corners area.

Thunderstorm Wind in TIOGA, NEW YORK
From 01-MAY-17 19:05:00 to 01-MAY-17 19:15:00 (EST-5)
Location: APALACHIN
Magnitude: 60.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: NWS Employee

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees which caused structural damage on a house.

Thunderstorm Wind in CHENANGO, NEW YORK
From 01-MAY-17 19:15:00 to 01-MAY-17 19:25:00 (EST-5)
Location: NORWICH
Magnitude: 60.00 EG
Property damage: 12.00K
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 multiple trees in the cities of Preston, New Berlin, Oxford, and Guilford.

Thunderstorm Wind in CHENANGO, NEW YORK
From 01-MAY-17 19:17:00 to 01-MAY-17 19:27:00 (EST-5)
Location: SHERBURNE
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees and power lines at the intersection of route 12 and 80. This intersection was also flooded.

Thunderstorm Wind in CHENANGO, NEW YORK
From 01-MAY-17 19:30:00 to 01-MAY-17 19:40:00 (EST-5)
Location: NEW BERLIN
Magnitude: 55.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked trees over on Shacktown mountain road.

Thunderstorm Wind in CHENANGO, NEW YORK
From 01-MAY-17 19:25:00 to 01-MAY-17 19:35:00 (EST-5)
Location: OXFORD
Magnitude: 65.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over, uprooted and sheared trees just north of the village of Oxford.

Thunderstorm Wind in STEUBEN, NEW YORK
From 01-MAY-17 16:15:00 to 01-MAY-17 16:25:00 (EST-5)
Location: HARTSVILLE
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A thunderstorm moved across the region and became severe. This thunderstorm produced a severe wind gust of 51 knots.

Thunderstorm Wind in ONONDAGA, NEW YORK
From 01-MAY-17 17:55:00 to 01-MAY-17 18:05:00 (EST-5)
Location: MANLIUS
Magnitude: 52.00 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 power lines in Manlius and in north Syracuse.

Thunderstorm Wind in BROOME, NEW YORK
From 01-MAY-17 18:50:00 to 01-MAY-17 19:00:00 (EST-5)
Location: VESTAL CENTER
Magnitude: 52.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over multiple trees in Vestal Center.

Thunderstorm Wind in BROOME, NEW YORK
From 01-MAY-17 18:50:00 to 01-MAY-17 19:00:00 (EST-5)
Location: (BGM)BINGHAMTON ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A thunderstorm moved across the region and became severe. This thunderstorm produced a severe wind gust of 52 knots.

Thunderstorm Wind in DELAWARE, NEW YORK
From 01-MAY-17 19:56:00 to 01-MAY-17 20:06:00 (EST-5)
Location: DELHI
Magnitude: 60.00 EG
Property damage: 12.00K
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 power lines.

Thunderstorm Wind in STEUBEN, NEW YORK
From 01-MAY-17 16:42:00 to 01-MAY-17 16:52:00 (EST-5)
Location: URBANA
Magnitude: 55.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: State Official

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked down power lines.

Thunderstorm Wind in SCHUYLER, NEW YORK
From 01-MAY-17 17:14:00 to 01-MAY-17 17:24:00 (EST-5)
Location: ALPINE
Magnitude: 50.00 EG
Property damage: 7.00K
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 a tree which damaged a trailer and created localized power outages.

Thunderstorm Wind in CHEMUNG, NEW YORK
From 01-MAY-17 17:57:00 to 01-MAY-17 18:07:00 (EST-5)
Location: ELMIRA
Magnitude: 60.00 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 multiple trees and power lines which blocked roadways.

Lightning in TIOGA, NEW YORK
From 01-MAY-17 18:40:00 to 01-MAY-17 18:41:00 (EST-5)
Location: APALACHIN
Property damage: 2.00K
Crop damage: 0.00K
Reported by: State Official

Lightning struck a tree.

Thunderstorm Wind in STEUBEN, NEW YORK
From 01-MAY-17 16:29:00 to 01-MAY-17 16:39:00 (EST-5)
Location: HORNELL
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: State Official

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

Thunderstorm Wind in CHENANGO, NEW YORK
From 01-MAY-17 19:10:00 to 01-MAY-17 19:20:00 (EST-5)
Location: OXFORD
Magnitude: 65.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and caused a large number of trees to be uprooted.

Thunderstorm Wind in CHENANGO, NEW YORK
From 01-MAY-17 19:18:00 to 01-MAY-17 19:28:00 (EST-5)
Location: NORWICH EATON ARPT
Magnitude: 88.00 MS
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over trees. The National Weather Service in Binghamton, New York conducted a storm survey and found microburst winds ranging between 90 to 100 mph. At least 100 healthy trees were snapped or uprooted around the city of Norwich reservoir along route 23.

Thunderstorm Wind in OTSEGO, NEW YORK
From 01-MAY-17 19:25:00 to 01-MAY-17 19:35:00 (EST-5)
Location: GILBERTSVILLE
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A thunderstorm moved across the region and became severe. This thunderstorm produced damaging winds.