Showers and thunderstorms developed along and ahead of an advancing cold front. The thunderstorms produced damaging winds that downed trees and power lines.  In Buffalo, the winds partially tore the roof off a building at Utica Street and Massachusetts Avenue. In Weedsport, a trampoline was lifted and landed on a house. The thunderstorms also produced hail up to one inch in diameter near Adams.

Thunderstorm Wind in ERIE, NEW YORK
From 04-AUG-17 16:08:00 to 04-AUG-17 16:08:00 (EST-5)
Location: SLOAN
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees down by thunderstorm winds on Bright Street.

Thunderstorm Wind in ERIE, NEW YORK
From 04-AUG-17 16:10:00 to 04-AUG-17 16:10:00 (EST-5)
Location: (BUF)GTR BUFFALO INT
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees down by thunderstorm winds on Chapel Avenue.

Thunderstorm Wind in CAYUGA, NEW YORK
From 04-AUG-17 16:20:00 to 04-AUG-17 16:20:00 (EST-5)
Location: MERIDIAN
Magnitude: 50.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds downed trees and power lines.

Thunderstorm Wind in ALLEGANY, NEW YORK
From 04-AUG-17 16:45:00 to 04-AUG-17 16:45:00 (EST-5)
Location: CANEADEA
Magnitude: 50.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires down by thunderstorm winds..

Thunderstorm Wind in ALLEGANY, NEW YORK
From 04-AUG-17 16:48:00 to 04-AUG-17 16:48:00 (EST-5)
Location: ANGELICA
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires down by thunderstorm winds.

Thunderstorm Wind in JEFFERSON, NEW YORK
From 04-AUG-17 16:53:00 to 04-AUG-17 16:53:00 (EST-5)
Location: ADAMS
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Trees and wires were downed by thunderstorm winds.

Hail in JEFFERSON, NEW YORK
From 04-AUG-17 16:55:00 to 04-AUG-17 16:55:00 (EST-5)
Location: ADAMS
Magnitude: 1.00 
Property damage: 5.00K
Reported by: Public

Thunderstorm Wind in JEFFERSON, NEW YORK
From 04-AUG-17 16:56:00 to 04-AUG-17 16:56:00 (EST-5)
Location: ELLISBURG
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires down by thunderstorm winds.

Thunderstorm Wind in OSWEGO, NEW YORK
From 04-AUG-17 18:17:00 to 04-AUG-17 18:17:00 (EST-5)
Location: SOUTHWEST OSWEGO
Magnitude: 50.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires down by thunderstorm winds.

Thunderstorm Wind in WAYNE, NEW YORK
From 04-AUG-17 18:38:00 to 04-AUG-17 18:38:00 (EST-5)
Location: WOLCOTT
Magnitude: 50.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires down by thunderstorm winds.

Thunderstorm Wind in ERIE, NEW YORK
From 04-AUG-17 11:42:00 to 04-AUG-17 11:42:00 (EST-5)
Location: BUFFALO
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The Fire Department reported trees down at Oconnell and Alabama Streets.

Thunderstorm Wind in ERIE, NEW YORK
From 04-AUG-17 11:43:00 to 04-AUG-17 11:43:00 (EST-5)
Location: WEST SENECA
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Trees were downed by thunderstorm winds in Cazenovia Park.

Thunderstorm Wind in ERIE, NEW YORK
From 04-AUG-17 11:45:00 to 04-AUG-17 11:45:00 (EST-5)
Location: LACKAWANNA
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A downed tree damaged a car on Romeleo Street.

Thunderstorm Wind in ERIE, NEW YORK
From 04-AUG-17 11:40:00 to 04-AUG-17 11:40:00 (EST-5)
Location: BUFFALO
Magnitude: 50.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds tore part off of a roof building in Buffalo.

Thunderstorm Wind in ERIE, NEW YORK
From 04-AUG-17 11:50:00 to 04-AUG-17 11:50:00 (EST-5)
Location: LACKAWANNA
Magnitude: 50.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters reported trees down on Dash Street in Buffalo.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 04-AUG-17 12:12:00 to 04-AUG-17 12:12:00 (EST-5)
Location: HANOVER CENTER
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees down by thunderstorm winds on Hanford Road.

Thunderstorm Wind in ERIE, NEW YORK
From 04-AUG-17 12:43:00 to 04-AUG-17 12:43:00 (EST-5)
Location: FOREST GLEN
Magnitude: 50.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees down by thunderstorm winds in the Village of Hamburg.

Thunderstorm Wind in ORLEANS, NEW YORK
From 04-AUG-17 12:47:00 to 04-AUG-17 12:47:00 (EST-5)
Location: CARLTON
Magnitude: 50.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires down by thunderstorm winds in Carlton.

Thunderstorm Wind in ERIE, NEW YORK
From 04-AUG-17 12:59:00 to 04-AUG-17 12:59:00 (EST-5)
Location: ELMA
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees down by thunderstorm winds.

Thunderstorm Wind in ORLEANS, NEW YORK
From 04-AUG-17 12:59:00 to 04-AUG-17 12:59:00 (EST-5)
Location: KENDALL
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires down by thunderstorm winds.

Thunderstorm Wind in OSWEGO, NEW YORK
From 04-AUG-17 13:54:00 to 04-AUG-17 13:54:00 (EST-5)
Location: EAST BOYLESTON
Magnitude: 50.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds downed trees and branches.

Thunderstorm Wind in WAYNE, NEW YORK
From 04-AUG-17 14:00:00 to 04-AUG-17 14:00:00 (EST-5)
Location: LYONS
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Social Media

A large trees downed by thunderstorm winds fell on a house.

Thunderstorm Wind in JEFFERSON, NEW YORK
From 04-AUG-17 14:37:00 to 04-AUG-17 14:37:00 (EST-5)
Location: CARTHAGE
Magnitude: 50.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and power lines down by thunderstorm winds.

Thunderstorm Wind in JEFFERSON, NEW YORK
From 04-AUG-17 14:50:00 to 04-AUG-17 14:50:00 (EST-5)
Location: PHILADELPHIA
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires down by thunderstorm winds.

Thunderstorm Wind in JEFFERSON, NEW YORK
From 04-AUG-17 15:22:00 to 04-AUG-17 15:22:00 (EST-5)
Location: REDWOOD
Magnitude: 50.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and wires down by thunderstorm winds.

Thunderstorm Wind in CAYUGA, NEW YORK
From 04-AUG-17 16:07:00 to 04-AUG-17 16:07:00 (EST-5)
Location: WEEDSPORT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds lifted a trampoline onto a house.