Most of the area was in the warm sector dry slot during the morning hours.  Storms developed along a pre-frontal trough around midday and moved east across the area. The axis of greatest instability as the pre-frontal trough moved through the region was the Southern Tier to Northern Finger Lakes and North Country. The lowest severe weather risk was across the Niagara Frontier including the Buffalo metro area due to lake shadowing. Precipitable water values increased to near 2 inches, with dew points approaching 70 degrees ahead of the storms. This also made the risk for heavy rainfall in any thunderstorms a concern. Storms did produce high rainfall rates, but they were moving at a fast enough pace that the overall flooding threat was limited. There were a few discrete cells that formed east of Lake Ontario around midday that produced some wind damage in Lewis County. Meanwhile, the main line of storms associated with the pre-frontal trough initiated along a line stretching from Lake Ontario southwest across Lake Erie into eastern Ohio. This line of storms just took off from there with bowing segments and some supercellular development occurring basically across the entire area.

Thunderstorm Wind in ALLEGANY, NEW YORK
From 21-JUN-21 14:34:00 to 21-JUN-21 14:34:00 (EST-5)
Location: STANNARDS
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees down onto Ford Brook North Branch.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 13:44:00 to 21-JUN-21 13:44:00 (EST-5)
Location: BRANTINGHAM
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires down on Brantingham Road.

Thunderstorm Wind in WAYNE, NEW YORK
From 21-JUN-21 15:12:00 to 21-JUN-21 15:12:00 (EST-5)
Location: PALMYRA
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees fell into a creek.

Thunderstorm Wind in WAYNE, NEW YORK
From 21-JUN-21 15:26:00 to 21-JUN-21 15:26:00 (EST-5)
Location: LYONS
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and power lines were downed in Lyons.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 13:33:00 to 21-JUN-21 13:33:00 (EST-5)
Location: HARRISVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were reported down in Harrisville.

Thunderstorm Wind in MONROE, NEW YORK
From 21-JUN-21 14:58:00 to 21-JUN-21 14:58:00 (EST-5)
Location: BUSHNELL BASIN
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Significant tree damage reported on I-490 at Route 96.

Thunderstorm Wind in MONROE, NEW YORK
From 21-JUN-21 14:48:00 to 21-JUN-21 14:48:00 (EST-5)
Location: RUSH
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Multiple trees and power lines down onto Route 15 near I-390.

Thunderstorm Wind in LIVINGSTON, NEW YORK
From 21-JUN-21 14:41:00 to 21-JUN-21 14:41:00 (EST-5)
Location: AVON
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple reports of trees down received in the Village of Avon.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 12:56:00 to 21-JUN-21 12:56:00 (EST-5)
Location: NEW BOSTON
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were downed onto McDonald Road.

Thunderstorm Wind in OSWEGO, NEW YORK
From 21-JUN-21 16:30:00 to 21-JUN-21 16:30:00 (EST-5)
Location: WEST MONROE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires were downed.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 17:03:00 to 21-JUN-21 17:03:00 (EST-5)
Location: TALLCOTTVILLE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires down on Lincoln Street. Trees down onto Domser Road.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 17:09:00 to 21-JUN-21 17:09:00 (EST-5)
Location: TURIN
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees down onto East Main Street.

Thunderstorm Wind in WYOMING, NEW YORK
From 21-JUN-21 14:20:00 to 21-JUN-21 14:20:00 (EST-5)
Location: WYOMING
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires down in the Village of Wyoming.

Thunderstorm Wind in WYOMING, NEW YORK
From 21-JUN-21 14:25:00 to 21-JUN-21 14:25:00 (EST-5)
Location: PEORIA
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees down on Lake Leroy Road.

Thunderstorm Wind in OSWEGO, NEW YORK
From 21-JUN-21 16:25:00 to 21-JUN-21 16:25:00 (EST-5)
Location: CARTERVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires were downed.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 17:09:00 to 21-JUN-21 17:09:00 (EST-5)
Location: PORT LEYDEN
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were downed onto Marmon Road near Penney Settlement Road.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 17:11:00 to 21-JUN-21 17:11:00 (EST-5)
Location: LYONSDALE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were downed onto Seymore Avenue and Shibley Road.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 17:14:00 to 21-JUN-21 17:14:00 (EST-5)
Location: GLENFIELD
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were downed onto Blue Street.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 17:14:00 to 21-JUN-21 17:14:00 (EST-5)
Location: GLENFIELD
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple trees were reported downed onto Pine Grove Road near Schoolhouse Road. Power poles were also blown down.

Thunderstorm Wind in ONTARIO, NEW YORK
From 21-JUN-21 15:01:00 to 21-JUN-21 15:01:00 (EST-5)
Location: VICTOR
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple reports of trees down received.

Thunderstorm Wind in MONROE, NEW YORK
From 21-JUN-21 14:58:00 to 21-JUN-21 14:58:00 (EST-5)
Location: RAILROAD MILLS
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A half of a dozen trees were blown down or uprooted. A few of the trees were snapped off about 25 feet above the ground.

Thunderstorm Wind in OSWEGO, NEW YORK
From 21-JUN-21 16:15:00 to 21-JUN-21 16:15:00 (EST-5)
Location: CAUGHDENOY
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: State Official

Trees and wires were downed.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 17:16:00 to 21-JUN-21 17:16:00 (EST-5)
Location: GLENFIELD
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple trees reported down on Pine Grove Road at Eatonville Road and Greeg Road at Brantingham Road.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 17:24:00 to 21-JUN-21 17:24:00 (EST-5)
Location: SPERRYVILLE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down across Stony Lake Road.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 13:25:00 to 21-JUN-21 13:25:00 (EST-5)
Location: BEAVER FALLS
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree fell onto a house with with wires down as well.

Thunderstorm Wind in ERIE, NEW YORK
From 21-JUN-21 13:45:00 to 21-JUN-21 13:45:00 (EST-5)
Location: EAST AURORA
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: NWS Employee

Large trees were downed.

Thunderstorm Wind in ONTARIO, NEW YORK
From 21-JUN-21 15:39:00 to 21-JUN-21 15:39:00 (EST-5)
Location: GENEVA
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple reports were received of trees down in Geneva.

Thunderstorm Wind in MONROE, NEW YORK
From 21-JUN-21 14:57:00 to 21-JUN-21 14:57:00 (EST-5)
Location: BUSHNELL BASIN
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

A large tree fell onto a house.

Thunderstorm Wind in ONTARIO, NEW YORK
From 21-JUN-21 15:02:00 to 21-JUN-21 15:02:00 (EST-5)
Location: FISHERS
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees down onto Fishers Road.

Thunderstorm Wind in ALLEGANY, NEW YORK
From 21-JUN-21 14:34:00 to 21-JUN-21 14:34:00 (EST-5)
Location: STANNARDS
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees down onto Ford Brook North Branch.

Thunderstorm Wind in LEWIS, NEW YORK
From 21-JUN-21 17:10:00 to 21-JUN-21 17:10:00 (EST-5)
Location: LOWVILLE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Widespread reports received of trees and wires down.

Thunderstorm Wind in MONROE, NEW YORK
From 21-JUN-21 14:50:00 to 21-JUN-21 14:50:00 (EST-5)
Location: HENRIETTA
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

Extensive damage was reported along I-90 near Henrietta.

Thunderstorm Wind in MONROE, NEW YORK
From 21-JUN-21 15:00:00 to 21-JUN-21 15:00:00 (EST-5)
Location: BUSHNELL BASIN
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

A tree fell onto a house near Highway 31.

Thunderstorm Wind in ERIE, NEW YORK
From 21-JUN-21 13:45:00 to 21-JUN-21 13:45:00 (EST-5)
Location: EAST AURORA
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: NWS Employee

Large trees were downed.

Thunderstorm Wind in WAYNE, NEW YORK
From 21-JUN-21 15:10:00 to 21-JUN-21 15:10:00 (EST-5)
Location: WAYNESPORT
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree fell onto a trailer on Quaker Road.