A very powerful low pressure system (980mb) moved across the Great Lakes into Ontario province Canada on December 9th.
Snow overspread the region before dawn with snowfall rates in excess of an inch per hour during the morning commute along with brisk winds of 15 to 25 mph with higher gusts. The snowfall ended by early to mid afternoon. Snowfall amounts ranged from a few inches in the northern Champlain Valley and along the western slopes of the Green Mountains to 6 to 12 inches in favored up slope communities along and east of the Green Mountains. Some specific snow totals; 14 inches in Chester, 12 inches in Cavendish and Springfield, 9 inches in Bridport, 8 inches in Moretown, Rutland and Walden. This was the first widespread snow event for the 2009-10 winter season with numerous vehicle accidents throughout Vermont.
More importantly, this powerful storm delivered a low-level jet stream of 80 to 100 mph around 3000 feet that flowed across the Green Mountains and downsloped into the communities along the western slopes of the Green Mountains. Surface wind gusts of 60 to 85 mph during the afternoon downed numerous tree branches and trees which knocked down power lines and caused some structural damage to several homes as well. More than 10,000 residents lost power in the peak of the storm.
Some observed peak wind gusts included; 108 mph atop of Mount Mansfield (4000 feet), 87 mph in Huntington, 74 mph in Cambridge, 66 mph in Nashville, 65 mph in East Clarendon, 62 mph in Bolton and 52 mph in Rutland.

Winter Weather in WESTERN CHITTENDEN, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in WESTERN FRANKLIN, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

High Wind in EASTERN FRANKLIN, VERMONT
From 09-DEC-09 14:00:00 to 09-DEC-09 18:00:00 (EST-5)
Magnitude: 55.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Winter Weather in WESTERN RUTLAND, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

High Wind in EASTERN RUTLAND, VERMONT
From 09-DEC-09 12:00:00 to 09-DEC-09 16:00:00 (EST-5)
Magnitude: 55.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

High Wind in EASTERN CHITTENDEN, VERMONT
From 09-DEC-09 14:00:00 to 09-DEC-09 18:00:00 (EST-5)
Magnitude: 76.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous reports of trees and power lines downed by damaging winds. Several reports of wind gusts of 60 to 85 mph and a few unofficial higher amounts.

High Wind in EASTERN ADDISON, VERMONT
From 09-DEC-09 14:00:00 to 09-DEC-09 18:00:00 (EST-5)
Magnitude: 74.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and power lines downed by high winds estimated between 60 and 85 mph during a three hour period. Route 116 between New Haven and East Middlebury was closed with some significant damage including a few structures. Some small planes were tossed from their moorings and some damage was down to sheet metal aircraft hangers.

Winter Storm in WINDSOR, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Weather in EASTERN ADDISON, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in ESSEX, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in GRAND ISLE, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in WASHINGTON, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Storm in WESTERN ADDISON, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Weather in EASTERN CHITTENDEN, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in EASTERN FRANKLIN, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in EASTERN RUTLAND, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Storm in LAMOILLE, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Storm in ORANGE, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

High Wind in WESTERN RUTLAND, VERMONT
From 09-DEC-09 12:00:00 to 09-DEC-09 16:00:00 (EST-5)
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Winter Storm in CALEDONIA, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winter Storm in ORLEANS, VERMONT
From 09-DEC-09 06:00:00 to 09-DEC-09 15:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer