A deepening area of consolidated low pressure tracked from the north shoreline of Lake Erie to Toronto, and then along the northern shoreline of Lake Ontario Thursday evening, October 31st. This system brought recorded breaking Halloween rains to our region, damaging wind gusts, a large Lake Erie seiche, a smaller Lake Ontario seiche, and river flooding in the North Country (Cayuga, Black and Moose River). Southwest winds increased dramatically on Halloween evening following a cold frontal passage. Immediately behind the front, winds were southwest and channeled across the typical locations northeast of Lake Erie from Dunkirk to the Niagara Frontier and eastward to Rochester. Southwest wind gusts were 45 to 50 mph. Potential vorticity analysis of this system was impressive, with the 1.5 PVU surface descending to below 700 hPa. This suggested a tropopause fold and intrusion of stratospheric air into the troposphere, which enhanced lapse rates and mixing potential. Furthermore, a fairly impressive isallobaric fall/rise couplet clipped the Niagara Frontier and then the Saint Lawrence Valley. With 75 knots of flow off the ground and mixing from the tropopause fold crossing the area, a secondary wind maxima to this wind event occurred overnight Thursday and into Friday with warning criteria winds. Thousands of power outages occurred across the area, and pervasive wind-related damage closed hundreds of roads and did countless tree damage across a vast swath of the area. A seiche occurred on Lake Erie, with water rising to just over 9 feet above low water datum just past 8 pm at Buffalo. A second push brought the lake up to 10.67 feet above low water datum with the tropopause fold induced winds. Lakeshore flooding inundated Canalside in Donwtown Buffalo, portions of Grand Island, Hoover Beach in Hamburg, and caused over $5.5 million in damage to homes and property in Erie County alone. Substantial damage was done to the Buffalo breakwall as well as continued destruction of the Dunkirk breakwater from the previous high water event on the lake from October 27. Enough damage was done across New York to have a Presidential Disaster Declaration. Heavy rain also brought flooding concerns. All three climate stations broke their daily October 31 records with 1 to 3 inches of rain falling across the CWA. Wind speeds peaked near and just after midnight on November 1 across most of the area. The maximum values included 61 mph in Fredonia, 59 mph at the Buffalo Airport, 63 mph in Cape Vincent, and 62 mph at Niagara Falls.

Lakeshore Flood in NORTHERN ERIE, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 04:24:00 (EST-5)
Property damage: 5500.00K
Crop damage: 0.00K
Reported by: Buoy

Lake Erie crested at 12:18 AM at Buffalo Harbor at a height of 10.56 ft above low water datum. Multiple high water rescues occurred on Grand Island, Niagara Street, and Tonawanda Street. Homes were flooded on Grand Island and along Route 5 near Hamburg. Erie County estimated that $5.5 in damage occurred due to the lake seice.

Lakeshore Flood in SOUTHERN ERIE, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 04:24:00 (EST-5)
Property damage: 5500.00K
Crop damage: 0.00K
Reported by: Buoy

Lake Erie crested at 12:18 AM at Buffalo Harbor at a height of 10.56 ft above low water datum. Multiple high water rescues occurred on Grand Island, Niagara Street, and Tonawanda Street. Homes were flooded on Grand Island and along Route 5 near Hamburg. Erie County estimated that $5.5 in damage occurred due to the lake seice.

Lakeshore Flood in CHAUTAUQUA, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 04:24:00 (EST-5)
Property damage: 1000.00K
Crop damage: 0.00K
Reported by: Buoy

Lake Erie crested at 12:18 AM at Buffalo Harbor at a height of 10.56 ft above low water datum. Additional damage subsequent to the damage from October 27 was done to the Dunkirk breakwater.

Lakeshore Flood in NIAGARA, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 04:24:00 (EST-5)
Property damage: 5500.00K
Crop damage: 0.00K
Reported by: Buoy

Lake Erie crested at 12:18 AM at Buffalo Harbor at a height of 10.56 ft above low water datum. The seiche from Lake Erie traveled up the Niagara River and actually flooded exit rams to I-190 in Niagara County.

High Wind in JEFFERSON, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 14:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in LEWIS, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 14:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in OSWEGO, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 14:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in NORTHERN CAYUGA, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 14:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Mesonet

Lakeshore Flood in JEFFERSON, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 12:00:00 (EST-5)
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Buoy

The Cape Vincent NOS site on eastern Lake Ontario recorded a seice that brough the lake level up to 4.51 ft above low water datum. This combined with onshore winds and waves exceeding 16 ft allowed for continue beach erosion in Jefferson and Oswego counties.

Lakeshore Flood in OSWEGO, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 12:00:00 (EST-5)
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Buoy

The Cape Vincent NOS site on eastern Lake Ontario recorded a seice that brough the lake level up to 4.51 ft above low water datum. This combined with onshore winds and waves exceeding 16 ft allowed for continue beach erosion in Jefferson and Oswego counties.

Flood in LEWIS, NEW YORK
From 01-NOV-19 08:15:00 to 01-NOV-19 17:15:00 (EST-5)
Location: TALLCOTTVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Black River at Boonville crested at 10.93 ft, above the flood stage of 10 ft, and caused minor flooding.

Flood in LEWIS, NEW YORK
From 01-NOV-19 09:00:00 to 01-NOV-19 10:30:00 (EST-5)
Location: PORTERS CORNERS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Moose River rose to 13.32 ft, above the flood stage of 12.0 ft, and cause minor flooding.

Flood in JEFFERSON, NEW YORK
From 02-NOV-19 18:00:00 to 03-NOV-19 12:00:00 (EST-5)
Location: GLEN PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Black River in Watertown rose to 11.24 ft, above the flood stage of 7.9 ft, and cause moderate flooding.

High Wind in NIAGARA, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in ALLEGANY, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in CATTARAUGUS, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in CHAUTAUQUA, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in GENESEE, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in LIVINGSTON, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in MONROE, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in NORTHERN ERIE, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in ONTARIO, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in ORLEANS, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in SOUTHERN ERIE, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in WAYNE, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in WYOMING, NEW YORK
From 01-NOV-19 00:00:00 to 01-NOV-19 09:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Mesonet