Lake effect snows began early on the morning of the 8th as deepening cold air in the wake of a strong cold front moved across the Lower Great Lakes. Up to three feet of snow fell in this general area, while amounts off Lake Ontario topped out at a foot and a half in the vicinity of the Tug Hill Plateau.  Snowfall rates increased to 2 inches per hour by daybreak in the Watertown area. Off Lake Erie, snow intensified with snowfall rates of up to 4 inches per hour accompanied by some lake effect thunder.  A surface based trough moved south across the region Thursday night (8th-9th).  The lake snow bands moved even further south in the wake of this feature, with the Lake Erie snow pushing deeper into Chautauqua and Cattaraugus counties while the Lake Ontario snows advanced to the south shore of the lake.  A somewhat brief upstream connection to Georgian Bay enhanced this latter band, so that four inches of lake snow accumulated in the Rochester area by daybreak on the 9th (Friday).  On Saturday the 10th, a low from the Upper Great Lakes moved across southernmost Ontario.  The resulting backing of the low level flow over Lakes Erie and Ontario directed the lake snows back to the north towards Buffalo and Watertown as the lake snows were weakening.
Off Lake Erie, specific snowfall amounts included: 38 inches at Perrysburg and East Concord, 36 inches at Cattaraugus and Springville, 35 inches at Little Valley, 34 inches at Napoli, 30 inches at Ellicottville and Sinclairville, 28 inches at Humphrey, 26 inches at Sardinia, 24 inches at Bemus Point, 22 inches at Allegany and Frewsburg, 20 inches at Randolph and Jamestown, 19 inches at Franklinville, 18 inches at Findlay Lake, 17 inches at Falconer, Glenwood, Boston and Forestville, 15 inches at Sherman, 14 inches at Warsaw, 13 inches at West Almond, 11 inches at Concord, 10 inches at Collins and Arcade, 9 inches at Kennedy, Ripley, Silver Springs and Fredonia, 8 inches at Alfred and 7 inches at Bolivar.
Off Lake Ontario, specific snowfall amounts included: 18 inches at Highmarket, 17 inches at Redfield, 16 inches at Constableville and Oswego, 14 inches at Minetto, 12 inches at Osceola, 9 inches at Beaver Falls, 8 inches at Black River, and 7 inches at Palermo and Fulton.

Lake-Effect Snow in WYOMING, NEW YORK
From 08-DEC-16 08:00:00 to 09-DEC-16 03:00:00 (EST-5)
Property damage: 16.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Lake-Effect Snow in CHAUTAUQUA, NEW YORK
From 08-DEC-16 08:00:00 to 11-DEC-16 00:00:00 (EST-5)
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lake-Effect Snow in CATTARAUGUS, NEW YORK
From 08-DEC-16 08:00:00 to 11-DEC-16 00:00:00 (EST-5)
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lake-Effect Snow in OSWEGO, NEW YORK
From 08-DEC-16 08:00:00 to 10-DEC-16 03:00:00 (EST-5)
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Social Media

Lake-Effect Snow in JEFFERSON, NEW YORK
From 08-DEC-16 08:00:00 to 09-DEC-16 23:00:00 (EST-5)
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Post Office

Lake-Effect Snow in LEWIS, NEW YORK
From 08-DEC-16 08:00:00 to 09-DEC-16 23:00:00 (EST-5)
Property damage: 25.00K
Crop damage: 0.00K
Reported by: COOP Observer

Lake-Effect Snow in SOUTHERN ERIE, NEW YORK
From 10-DEC-16 06:00:00 to 11-DEC-16 03:00:00 (EST-5)
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lake-Effect Snow in OSWEGO, NEW YORK
From 10-DEC-16 08:00:00 to 11-DEC-16 09:00:00 (EST-5)
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lake-Effect Snow in SOUTHERN ERIE, NEW YORK
From 08-DEC-16 08:00:00 to 10-DEC-16 03:00:00 (EST-5)
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter