A mesoscale convective system exited Lower Michigan into Lake Huron in the early morning hours. In a very unstable air mass ahead of this feature, and along a warm frontal segment over Lake Erie, scattered convection developed over Lake Erie. Dewpoints south-southwest of the warm front were commonly in the lower to middle 70s over Ohio, and this was no doubt feeding these storms. This scattered convection suddenly congealed into a line of strong storms just west of Chautauqua County with a southwest to northeast oriented rear inflow jet and peak velocity over 60 knots that surged northeast up Lake Erie toward the Erie County shoreline. These storms moved inland and continued eastward through the Genesee Valley and the northern Finger Lakes.

Thunderstorm Wind in LIVINGSTON, NEW YORK
From 11-AUG-21 06:52:00 to 11-AUG-21 06:52:00 (EST-5)
Location: LIVONIA
Magnitude: 51.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was downed onto Main Street.

Thunderstorm Wind in ERIE, NEW YORK
From 11-AUG-21 06:00:00 to 11-AUG-21 06:00:00 (EST-5)
Location: LACKAWANNA
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Trees and powerlines were down at the intersection of Amber Street and South Park Avenue.

Thunderstorm Wind in ERIE, NEW YORK
From 11-AUG-21 06:00:00 to 11-AUG-21 06:00:00 (EST-5)
Location: LACKAWANNA
Magnitude: 51.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Trees and branches were downed in Cazenovia Park.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 11-AUG-21 05:21:00 to 11-AUG-21 05:21:00 (EST-5)
Location: SILVER CREEK
Magnitude: 51.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was downed onto route 20.

Thunderstorm Wind in ERIE, NEW YORK
From 11-AUG-21 05:56:00 to 11-AUG-21 05:56:00 (EST-5)
Location: LACKAWANNA
Magnitude: 51.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A railroad track arm was snapped by fallen tree debris.

Thunderstorm Wind in ONTARIO, NEW YORK
From 11-AUG-21 07:28:00 to 11-AUG-21 07:28:00 (EST-5)
Location: SHORTSVILLE
Magnitude: 51.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were down onto West Main Street.

Thunderstorm Wind in WYOMING, NEW YORK
From 11-AUG-21 06:20:00 to 11-AUG-21 06:20:00 (EST-5)
Location: CURRIERS
Magnitude: 51.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple trees and power lines were reported down.

Thunderstorm Wind in WYOMING, NEW YORK
From 11-AUG-21 06:20:00 to 11-AUG-21 06:20:00 (EST-5)
Location: WETHERSFIELD SPGS
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple trees were reported downed.

Thunderstorm Wind in MONROE, NEW YORK
From 11-AUG-21 07:00:00 to 11-AUG-21 07:00:00 (EST-5)
Location: MUMFORD
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were reported downed onto Scottsville Mumford Road and Belcoda Road.

Thunderstorm Wind in MONROE, NEW YORK
From 11-AUG-21 07:16:00 to 11-AUG-21 07:16:00 (EST-5)
Location: BRIGHTON
Magnitude: 51.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was downed onto Poplar Street.

Thunderstorm Wind in MONROE, NEW YORK
From 11-AUG-21 07:16:00 to 11-AUG-21 07:16:00 (EST-5)
Location: BRIGHTON PO
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were downed onto Council Rock Avenue.

Thunderstorm Wind in WYOMING, NEW YORK
From 11-AUG-21 06:22:00 to 11-AUG-21 06:22:00 (EST-5)
Location: ATTICA
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple trees and powerlines were reported down.

Thunderstorm Wind in WYOMING, NEW YORK
From 11-AUG-21 06:22:00 to 11-AUG-21 06:22:00 (EST-5)
Location: WARSAW
Magnitude: 51.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple trees were reported downed.

Thunderstorm Wind in ERIE, NEW YORK
From 11-AUG-21 05:55:00 to 11-AUG-21 05:55:00 (EST-5)
Location: LACKAWANNA
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in ERIE, NEW YORK
From 11-AUG-21 06:13:00 to 11-AUG-21 06:13:00 (EST-5)
Location: ALDEN
Magnitude: 51.00 EG
Property damage: 0.10K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy planters were knocked over, and a table was thrown in strong wind.

Thunderstorm Wind in ERIE, NEW YORK
From 11-AUG-21 05:36:00 to 11-AUG-21 05:36:00 (EST-5)
Location: DERBY
Magnitude: 51.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Uprooted trees were reported on m-ping.

Thunderstorm Wind in ERIE, NEW YORK
From 11-AUG-21 05:31:00 to 11-AUG-21 05:31:00 (EST-5)
Location: NORTH COLLINS
Magnitude: 51.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Department of Highways

Trees were reported down on Gowanda State Road. All lanes of travel were closed at Shirley Road.

Thunderstorm Wind in LIVINGSTON, NEW YORK
From 11-AUG-21 06:56:00 to 11-AUG-21 06:56:00 (EST-5)
Location: GENESEO
Magnitude: 51.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was reported down onto Country Club Road.