Showers and thunderstorms developed in a very unstable environment Thursday afternoon along a pre-frontal trough. The trough was aligned north-south across the state of New York and Pennsylvania ahead of an advancing cold front. The thunderstorms quickly developed into a line and moved east. Some of the storms became severe and produced damaging winds and large hail.

Hail in ONONDAGA, NEW YORK
From 18-MAY-17 17:36:00 to 18-MAY-17 17:46:00 (EST-5)
Location: BREWERTON
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

A severe thunderstorm developed over the area and produced golf ball sized hail.

Thunderstorm Wind in CAYUGA, NEW YORK
From 18-MAY-17 16:49:00 to 18-MAY-17 16:59:00 (EST-5)
Location: SCIPIO CENTER
Magnitude: 55.00 EG
Property damage: 5.00K
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 caused structural damage.

Thunderstorm Wind in MADISON, NEW YORK
From 18-MAY-17 16:55:00 to 18-MAY-17 17:05:00 (EST-5)
Location: DE RUYTER
Magnitude: 55.00 EG
Property damage: 7.00K
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 and power line poles.

Thunderstorm Wind in CAYUGA, NEW YORK
From 18-MAY-17 17:10:00 to 18-MAY-17 17:20:00 (EST-5)
Location: CASCADE
Magnitude: 55.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over a telephone pole.

Thunderstorm Wind in MADISON, NEW YORK
From 18-MAY-17 17:22:00 to 18-MAY-17 17:32:00 (EST-5)
Location: ERIEVILLE
Magnitude: 50.00 EG
Property damage: 4.00K
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 multiple power lines.

Hail in ONONDAGA, NEW YORK
From 18-MAY-17 16:52:00 to 18-MAY-17 17:02:00 (EST-5)
Location: BREWERTON
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

A severe thunderstorm developed over the area and produced golf ball sized hail.

Thunderstorm Wind in CAYUGA, NEW YORK
From 18-MAY-17 16:10:00 to 18-MAY-17 16:20:00 (EST-5)
Location: SCIPIO CENTER
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm moved across the region and became severe. This thunderstorm produced a severe wind gust of 54 knots.

Thunderstorm Wind in ONONDAGA, NEW YORK
From 18-MAY-17 17:50:00 to 18-MAY-17 18:00:00 (EST-5)
Location: TULLY
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 which blocked the roadway.

Thunderstorm Wind in CAYUGA, NEW YORK
From 18-MAY-17 16:10:00 to 18-MAY-17 16:20:00 (EST-5)
Location: SCIPIO CENTER
Magnitude: 55.00 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 55 knots.

Thunderstorm Wind in CAYUGA, NEW YORK
From 18-MAY-17 16:18:00 to 18-MAY-17 16:28:00 (EST-5)
Location: WYCKOFF
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

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 18-MAY-17 16:35:00 to 18-MAY-17 16:45:00 (EST-5)
Location: TULLY
Magnitude: 55.00 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 55 knots.

Thunderstorm Wind in STEUBEN, NEW YORK
From 18-MAY-17 17:40:00 to 18-MAY-17 17:50:00 (EST-5)
Location: HOWARD
Magnitude: 50.00 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 on a power line.

Hail in CAYUGA, NEW YORK
From 18-MAY-17 15:50:00 to 18-MAY-17 16:00:00 (EST-5)
Location: THROOPSVILLE
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A severe thunderstorm developed over the area and produced golf ball sized hail.

Hail in ONONDAGA, NEW YORK
From 18-MAY-17 17:05:00 to 18-MAY-17 17:15:00 (EST-5)
Location: BREWERTON
Magnitude: 1.25 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

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

Thunderstorm Wind in CAYUGA, NEW YORK
From 18-MAY-17 16:21:00 to 18-MAY-17 16:31:00 (EST-5)
Location: MORAVIA
Magnitude: 55.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm moved across the region and became severe. This thunderstorm produced severe winds and knocked over a large tree, several large branches and power lines on the ground.