Several rounds of thunderstorms moved across the region during from the afternoon through the early overnight hours.  Numerous storms tracked from the western Southern Tier across the northern Finger Lakes and into the eastern Lake Ontario region. Numerous reports of hail from dime- to golf-ball sized were received. The hail, up to two-and-a-half inches, did damage siding, autos and broke windows. There were also some reports of downed trees and wires from the thunderstorm winds. Downed trees blocked several roads.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 18-MAY-17 22:55:00 to 18-MAY-17 22:55:00 (EST-5)
Location: SILVER CREEK
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires downed by thunderstorm winds.

Hail in ERIE, NEW YORK
From 18-MAY-17 14:38:00 to 18-MAY-17 14:38:00 (EST-5)
Location: EAST CONCORD
Magnitude: 1.00 
Reported by: Public

Hail in LIVINGSTON, NEW YORK
From 18-MAY-17 14:55:00 to 18-MAY-17 14:55:00 (EST-5)
Location: DANSVILLE
Magnitude: 0.75 
Reported by: CoCoRaHS

Hail in ONTARIO, NEW YORK
From 18-MAY-17 15:12:00 to 18-MAY-17 15:12:00 (EST-5)
Location: OAKS CORNERS
Magnitude: 1.25 
Reported by: Broadcast Media

Thunderstorm Wind in LIVINGSTON, NEW YORK
From 18-MAY-17 15:30:00 to 18-MAY-17 15:30:00 (EST-5)
Location: ROSS CORNERS
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires downed by thunderstorm winds.

Thunderstorm Wind in ONTARIO, NEW YORK
From 18-MAY-17 15:41:00 to 18-MAY-17 15:41:00 (EST-5)
Location: GENEVA
Magnitude: 52.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds downed trees and large branches which blocked sections of St. Clair Street.

Hail in ERIE, NEW YORK
From 18-MAY-17 14:22:00 to 18-MAY-17 14:22:00 (EST-5)
Location: COLLINS
Magnitude: 1.00 
Reported by: Public

Hail in LIVINGSTON, NEW YORK
From 18-MAY-17 14:24:00 to 18-MAY-17 14:24:00 (EST-5)
Location: SOUTH LIMA
Magnitude: 1.00 
Reported by: Broadcast Media

Hail in LIVINGSTON, NEW YORK
From 18-MAY-17 14:24:00 to 18-MAY-17 14:24:00 (EST-5)
Location: SOUTH LIMA
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ERIE, NEW YORK
From 18-MAY-17 14:33:00 to 18-MAY-17 14:33:00 (EST-5)
Location: NEW OREGON
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in ERIE, NEW YORK
From 18-MAY-17 14:34:00 to 18-MAY-17 14:34:00 (EST-5)
Location: NEW OREGON
Magnitude: 0.88 
Reported by: Public

Thunderstorm Wind in LEWIS, NEW YORK
From 18-MAY-17 16:44:00 to 18-MAY-17 16:44:00 (EST-5)
Location: CROGHAN
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees downed by thunderstorm winds.

Thunderstorm Wind in LEWIS, NEW YORK
From 18-MAY-17 16:48:00 to 18-MAY-17 16:48:00 (EST-5)
Location: NEW BREMEN DUFLO ARP
Magnitude: 52.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires downed by thunderstorm winds in New Bremen.

Hail in OSWEGO, NEW YORK
From 18-MAY-17 16:54:00 to 18-MAY-17 16:54:00 (EST-5)
Location: FULTON
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in OSWEGO, NEW YORK
From 18-MAY-17 16:59:00 to 18-MAY-17 16:59:00 (EST-5)
Location: PHOENIX
Magnitude: 1.50 
Reported by: NWS Employee

Hail in OSWEGO, NEW YORK
From 18-MAY-17 16:59:00 to 18-MAY-17 16:59:00 (EST-5)
Location: VOLNEY
Magnitude: 2.50 
Reported by: Social Media

Thunderstorm Wind in OSWEGO, NEW YORK
From 18-MAY-17 16:59:00 to 18-MAY-17 16:59:00 (EST-5)
Location: PALERMO
Magnitude: 52.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires downed by thunderstorm winds.

Hail in OSWEGO, NEW YORK
From 18-MAY-17 17:00:00 to 18-MAY-17 17:00:00 (EST-5)
Location: FULTON
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in OSWEGO, NEW YORK
From 18-MAY-17 17:00:00 to 18-MAY-17 17:00:00 (EST-5)
Location: CLIFFORD
Magnitude: 2.50 
Reported by: Social Media

Hail in OSWEGO, NEW YORK
From 18-MAY-17 17:00:00 to 18-MAY-17 17:00:00 (EST-5)
Location: MT PLEASANT
Magnitude: 2.00 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Large hail broke windows and damaged building siding.

Hail in OSWEGO, NEW YORK
From 18-MAY-17 17:05:00 to 18-MAY-17 17:05:00 (EST-5)
Location: CENTRAL SQUARE
Magnitude: 1.50 
Reported by: Broadcast Media

Hail in OSWEGO, NEW YORK
From 18-MAY-17 17:05:00 to 18-MAY-17 17:05:00 (EST-5)
Location: CLIFFORD
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in OSWEGO, NEW YORK
From 18-MAY-17 17:06:00 to 18-MAY-17 17:06:00 (EST-5)
Location: CENTRAL SQUARE
Magnitude: 1.75 
Reported by: NWS Employee

Hail in OSWEGO, NEW YORK
From 18-MAY-17 17:06:00 to 18-MAY-17 17:06:00 (EST-5)
Location: WELLWOOD
Magnitude: 2.50 
Reported by: Social Media

Thunderstorm Wind in LEWIS, NEW YORK
From 18-MAY-17 17:07:00 to 18-MAY-17 17:07:00 (EST-5)
Location: BEACHES BRIDGE
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires downed by thunderstorm winds on Number 4 Road.

Thunderstorm Wind in OSWEGO, NEW YORK
From 18-MAY-17 17:09:00 to 18-MAY-17 17:09:00 (EST-5)
Location: WEST MONROE
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires downed by thunderstorm winds.

Thunderstorm Wind in OSWEGO, NEW YORK
From 18-MAY-17 17:13:00 to 18-MAY-17 17:13:00 (EST-5)
Location: CONSTANTIA
Magnitude: 52.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires downed by thunderstorm winds.

Hail in OSWEGO, NEW YORK
From 18-MAY-17 17:16:00 to 18-MAY-17 17:16:00 (EST-5)
Location: ALBION CENTER
Magnitude: 1.50 
Reported by: Public

Hail in OSWEGO, NEW YORK
From 18-MAY-17 17:21:00 to 18-MAY-17 17:21:00 (EST-5)
Location: ALTMAN
Magnitude: 1.75 
Reported by: Trained Spotter

Thunderstorm Wind in OSWEGO, NEW YORK
From 18-MAY-17 17:21:00 to 18-MAY-17 17:21:00 (EST-5)
Location: CLEVELAND
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires downed by thunderstorm winds.

Hail in CHAUTAUQUA, NEW YORK
From 18-MAY-17 22:43:00 to 18-MAY-17 22:43:00 (EST-5)
Location: DUNKIRK
Magnitude: 0.75 
Reported by: Trained Spotter