Two Pacific shortwave troughs promoted the formation and deepening of a surface low that tracked from the Great Plains, across southern Lake Michigan, and eventually to near James Bay while deepening below 980 mb. This pushed a strong cold front crossed our region. A strong isallobaric couplet with large pressure rises and a low-level jet of 75 knots just a few thousand feet off the ground supported a high wind event. Selected peak wind gusts included 57 mph in Wyoming, 68 mph in Fredonia, 71 mph at the Buffalo Waterfront, 66 mph at Buffalo-Niagara International Airport, 70 mph at Batavia, 66 mph at Fort Drum, 65 mph in Harrisburg, 59 mph in York. 63 mph in Brockport, 60 mph at Rochester Airport, 74 mph at Niagara Falls Airport, 65 mph at Clifton Springs, 61 mph in Medina, 61 mph in Pultneyville, and 71 mph in Warsaw. Strong surface high pressure over the southern Plains amplified the pressure gradient such that a lake seiche did occur on Lake Erie with a smaller one evident on Lake Ontario, as well. The water level in downtown Buffalo rose to 10.6 feet above low water datum.

Lakeshore Flood in NORTHERN ERIE, NEW YORK
From 11-DEC-21 16:12:00 to 11-DEC-21 21:00:00 (EST-5)
Property damage: 500.00K
Crop damage: 0.00K
Reported by: WLON

The seiche on Lake Erie flooded Canalside in downtown Buffalo. This included parking lots for the ongoing hockey game at Key Bank Arena. Dozens of vehicles were inundated with water.

Lakeshore Flood in SOUTHERN ERIE, NEW YORK
From 11-DEC-21 16:12:00 to 11-DEC-21 21:00:00 (EST-5)
Property damage: 500.00K
Crop damage: 0.00K
Reported by: WLON

The seiche on Lake Erie inundated Route 5 near Hamburg as well as many homes along the lakeshore. It necessitated the evacuation of Hoover Beach as waves crashed into homes.

Lakeshore Flood in NIAGARA, NEW YORK
From 11-DEC-21 16:12:00 to 11-DEC-21 21:00:00 (EST-5)
Property damage: 10.00K
Crop damage: 0.00K
Reported by: WLON

Lakeshore Flood in CHAUTAUQUA, NEW YORK
From 11-DEC-21 16:12:00 to 11-DEC-21 21:00:00 (EST-5)
Property damage: 500.00K
Crop damage: 0.00K
Reported by: WLON

The seiche on Lake Erie results in the evacuation of Sunset Bay. This left most homes under at least two feet of water.

Lakeshore Flood in JEFFERSON, NEW YORK
From 11-DEC-21 17:00:00 to 12-DEC-21 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: WLON

Winds and waves caused significant erosion on the shoreline of Lake Ontario. Storm forced winds over the lake actually generated a seiche on the lake that brought the Cape Vincent water level up to 247.4 feet above low water datum.

Lakeshore Flood in OSWEGO, NEW YORK
From 11-DEC-21 17:00:00 to 12-DEC-21 00:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: WLON

Winds and waves caused significant erosion on the shoreline of Lake Ontario.

High Wind in CHAUTAUQUA, NEW YORK
From 11-DEC-21 14:00:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 59.00 MG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Mesonet

Dozens of reports of trees and powerlines down were received.

High Wind in SOUTHERN ERIE, NEW YORK
From 11-DEC-21 15:00:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 59.00 MG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Dozens of reports of trees and powerlines down were received.

High Wind in NORTHERN ERIE, NEW YORK
From 11-DEC-21 15:00:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 64.00 MG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Mesonet

Dozens of reports of trees and powerlines down were received.

High Wind in NIAGARA, NEW YORK
From 11-DEC-21 15:00:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 64.00 MG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: ASOS

Dozens of reports of trees and powerlines down were received.

High Wind in ORLEANS, NEW YORK
From 11-DEC-21 15:00:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 53.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Mesonet

Dozens of reports of trees and powerlines down were received.

High Wind in GENESEE, NEW YORK
From 11-DEC-21 15:00:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 66.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Mesonet

Dozens of reports of trees and powerlines down were received.

High Wind in WYOMING, NEW YORK
From 11-DEC-21 15:00:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 62.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Mesonet

Dozens of reports of trees and powerlines down were received.

High Wind in CATTARAUGUS, NEW YORK
From 11-DEC-21 15:00:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Dozens of reports of trees and powerlines down were received.

High Wind in ALLEGANY, NEW YORK
From 11-DEC-21 15:00:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Dozens of reports of trees and powerlines down were received.

High Wind in LIVINGSTON, NEW YORK
From 11-DEC-21 15:00:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 51.00 MG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Mesonet

Dozens of reports of trees and powerlines down were received.

High Wind in ONTARIO, NEW YORK
From 11-DEC-21 15:00:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 56.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Mesonet

Dozens of reports of trees and powerlines down were received.

High Wind in MONROE, NEW YORK
From 11-DEC-21 16:00:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 55.00 MG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Mesonet

Dozens of reports of trees and powerlines down were received.

High Wind in WAYNE, NEW YORK
From 11-DEC-21 16:00:00 to 12-DEC-21 01:00:00 (EST-5)
Magnitude: 53.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Dozens of reports of trees and powerlines down were received.

High Wind in NORTHERN CAYUGA, NEW YORK
From 11-DEC-21 16:00:00 to 12-DEC-21 01:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Dozens of reports of trees and powerlines down were received.

High Wind in OSWEGO, NEW YORK
From 11-DEC-21 17:00:00 to 12-DEC-21 01:00:00 (EST-5)
Magnitude: 53.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Dozens of reports of trees and powerlines down were received.

High Wind in JEFFERSON, NEW YORK
From 11-DEC-21 17:00:00 to 12-DEC-21 01:00:00 (EST-5)
Magnitude: 57.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: AWOS

Dozens of reports of trees and powerlines down were received.

High Wind in LEWIS, NEW YORK
From 11-DEC-21 17:00:00 to 12-DEC-21 01:00:00 (EST-5)
Magnitude: 56.00 MG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Mesonet

Dozens of reports of trees and powerlines down were received.