A powerful storm system across the Great Lakes on the afternoon of December 11th moved northeast across Ontario and Quebec provinces in Canada during the night. A very powerful jet structure with winds in excess of 100 knots at 5000 feet moved across the eastern Great Lakes and northern NY.
The associated cold front was the demarcation line of mixing these strong winds to the surface. These strong and damaging winds in excess of 50-70 mph entered the region during the early evening and gradually decreased into the 30-40 mph range after midnight. Estimated power outages across this region was 15-20,000 customers with a few snapped utility poles in addition to numerous trees down blocking several roads and/or landing on small structures.
Some of the top wind gusts by ASOS or NYS mesonet included; 73 mph in Malone (Franklin county), 68 mph in Hammond, 67 mph in Potsdam, 64 mph Massena (St. Lawrence county), 65 mph in Ellenburg (Clinton county), 63 mph Gabriels (Franklin county.

High Wind in WESTERN CLINTON, NEW YORK
From 11-DEC-21 19:00:00 to 12-DEC-21 00:00:00 (EST-5)
Magnitude: 56.00 MG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: County Official

Numerous tree branches and trees down that fell on utility lines, roads and small structures across northern and western Clinton county. Several wind gusts in excess of 50-55 mph with a measured 65 mph in Ellenburg.

High Wind in NORTHERN ST. LAWRENCE, NEW YORK
From 11-DEC-21 17:45:00 to 11-DEC-21 23:00:00 (EST-5)
Magnitude: 58.00 MG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: County Official

Numerous tree branches and trees down that fell on utility lines, roads and small structures across St. Lawrence county. Numerous wind gusts in excess of 50-55 mph with a measured 67 mph in Potsdam, 64 mph in Massena.

High Wind in SOUTHWESTERN ST. LAWRENCE, NEW YORK
From 11-DEC-21 17:45:00 to 11-DEC-21 22:30:00 (EST-5)
Magnitude: 59.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: County Official

Numerous tree branches and trees down that fell on utility lines, roads and small structures across St. Lawrence county. Numerous wind gusts in excess of 50 mph with a measured 68 mph in Edwardsville.

High Wind in SOUTHEASTERN ST. LAWRENCE, NEW YORK
From 11-DEC-21 17:45:00 to 11-DEC-21 22:30:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: County Official

Several reports of down tree branches and trees down that fell on utility lines, roads in SE St. Lawrence county. Measured wind gusts of 55 mph was reported in areas with light damage, thus estimated 60 mph or greater in damage areas.

High Wind in NORTHERN FRANKLIN, NEW YORK
From 11-DEC-21 18:00:00 to 12-DEC-21 00:00:00 (EST-5)
Magnitude: 63.00 MG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: County Official

Numerous tree branches and trees down that fell on utility lines, roads and small structures across northern Franklin county. Numerous wind gusts in excess of 50-55 mph with a measured 73 mph in Malone and 63 mph in Gabriels.

High Wind in EASTERN CLINTON, NEW YORK
From 11-DEC-21 19:00:00 to 12-DEC-21 00:00:00 (EST-5)
Magnitude: 50.00 MG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: County Official

Numerous tree branches and trees down that fell on utility lines, roads and small structures across northern and eastern Clinton county. Several wind gusts in excess of 50-55 mph with a measured 62 mph in Plattsburgh Bay and 57 mph in Chazy.

High Wind in SOUTHERN FRANKLIN, NEW YORK
From 11-DEC-21 19:00:00 to 12-DEC-21 00:00:00 (EST-5)
Magnitude: 52.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: County Official

Numerous tree branches and several trees down that fell on utility lines and roads in southern Franklin especially in the Tri-Lakes region near Tupper Lake and Saranac Lake.

Strong Wind in EASTERN ESSEX, NEW YORK
From 11-DEC-21 19:30:00 to 12-DEC-21 00:00:00 (EST-5)
Magnitude: 44.00 MG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Mesonet

Several mesonet reports of wind gusts in the 45 to 50 mph range with scattered light tree damage in the form of downed limbs and weak trees that caused some power outages.

Strong Wind in WESTERN ESSEX, NEW YORK
From 11-DEC-21 19:30:00 to 12-DEC-21 00:00:00 (EST-5)
Magnitude: 40.00 MG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Mesonet

Several mesonet reports of wind gusts in the 45 to 50 mph range with scattered light tree damage in the form of downed limbs and weak trees that caused some power outages.