A strong cold front crossed the Lower Great Lakes from west to east during the day of the 19th.  The airmass was only marginally cold by late in the day on the 19th, with lake effect rain mixed with wet snow developing off Lake Erie near Buffalo, changing to all snow across the higher terrain south of the city during the evening.  The heavier snow did not develop until a secondary cold front crossed the area on the morning of the 20th, bringing a strong push of arctic air into the region.  A strong area of low pressure developed over New England on the 20th and moved very slowly north into southern Quebec on the 21st.  Abundant moisture and lift associated with the strong low pressure system produced widespread light to moderate snow across much of the region from the Genesee Valley into Central and Northern New York.  Lake enhanced snow covered a much larger area than in our typical lake effect snow events that feature very narrow bands of heavy snow.  The most persistent lake enhanced snow was found east and southeast of Lake Ontario with storm totals of over one foot in a large area from Rochester eastward to the Tug Hill region and Watertown.  Upstream connections to lake effect snow off Georgian Bay also enhanced snowfall across parts of Central New York.  Very persistent upslope flow into the higher terrain of the Tug Hill Plateau played a critical role in producing the highest totals from this event, with a few locations seeing three to four feet of snow over a three day period.  This event also produced unusually heavy amounts of lake effect snow outside of our area across the Finger Lakes.  Off Lake Erie, the northwest wind direction through the bulk of the event greatly limited the fetch across the short axis of the lake, and produced much lower snowfall totals.  Upslope flow into the higher terrain of the Chautauqua Ridge and portions of Southern Erie and Wyoming counties helped to enhance snowfall amounts to some extent, and a few brief upstream connections to Lake Huron also developed. Total amounts over the 3 day period were generally in the 8-12 inch range across the higher terrain east and southeast of Lake Erie.  Specific snowfall reports off Lake Erie included:  12 inches at Warsaw and East Concord, 11 inches at Colden, and 9 inches at Jamestown. Off Lake Ontario, reports included:  55 inches at Redfield, 48 inches at Osceola, 30 inches at Lorraine, 24 inches at Croghan, 18 inches at Watertown and Lyons, 17 inches at Geneva, 16 inches at Fairport, 15 inches at Rochester, 10 inches at Lima and 9 inches at Stafford.

Lake-Effect Snow in CHAUTAUQUA, NEW YORK
From 19-NOV-16 19:00:00 to 21-NOV-16 09:00:00 (EST-5)
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lake-Effect Snow in CATTARAUGUS, NEW YORK
From 19-NOV-16 19:00:00 to 21-NOV-16 09:00:00 (EST-5)
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lake-Effect Snow in SOUTHERN ERIE, NEW YORK
From 19-NOV-16 19:00:00 to 21-NOV-16 09:00:00 (EST-5)
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Lake-Effect Snow in WAYNE, NEW YORK
From 20-NOV-16 02:00:00 to 22-NOV-16 03:00:00 (EST-5)
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Social Media

Lake-Effect Snow in NORTHERN CAYUGA, NEW YORK
From 20-NOV-16 02:00:00 to 22-NOV-16 03:00:00 (EST-5)
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lake-Effect Snow in OSWEGO, NEW YORK
From 20-NOV-16 02:00:00 to 22-NOV-16 03:00:00 (EST-5)
Property damage: 50.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Lake-Effect Snow in JEFFERSON, NEW YORK
From 20-NOV-16 02:00:00 to 22-NOV-16 03:00:00 (EST-5)
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lake-Effect Snow in LEWIS, NEW YORK
From 20-NOV-16 02:00:00 to 22-NOV-16 03:00:00 (EST-5)
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Social Media

Lake-Effect Snow in MONROE, NEW YORK
From 20-NOV-16 00:54:00 to 22-NOV-16 03:00:00 (EST-5)
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Lake-Effect Snow in ONTARIO, NEW YORK
From 20-NOV-16 00:54:00 to 22-NOV-16 03:00:00 (EST-5)
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Social Media

Lake-Effect Snow in GENESEE, NEW YORK
From 20-NOV-16 18:10:00 to 22-NOV-16 03:00:00 (EST-5)
Property damage: 20.00K
Crop damage: 0.00K
Reported by: NWS Employee

Lake-Effect Snow in LIVINGSTON, NEW YORK
From 20-NOV-16 18:10:00 to 22-NOV-16 03:00:00 (EST-5)
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Social Media

Lake-Effect Snow in WYOMING, NEW YORK
From 20-NOV-16 18:10:00 to 21-NOV-16 09:00:00 (EST-5)
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter