A very deep upper level trough from Central Canada to the Gulf of Mexico allowed for a warm, moist flow with temperatures in the 50s and 60s through the early evening hours of January 12th across VT. An arctic front moved across VT during the night with temperatures by Saturday morning (January 13th) in the teens and 20s and falling throughout the day. In addition low pressure traveled along the front as it moved across Vermont delivering an inch or more of precipitation in the form of rain, freezing rain, sleet and snow.
Several impacts occurred with this event. First, temperatures 25 to 30 degrees above normal caused significant snow melt across the region and then an  inch or more of rainfall in January 12th lead to rivers approaching bankfull with several reports of flooding due to ice jams. Some of these rivers included the Winooski near Montpelier Jct, Lamoille at Johnson, Passumpsic near Lyndonville, Missisquoi near Swanton and the Connecticut river near Windsor.
Second, rapidly falling temperatures overnight into Saturday morning accounted for rain changing to freezing rain, sleet then snow. Significant sleet occurred in the Champlain Valley and much of central VT with 4 to 8 inches of snow as well across northwest VT. Sharply falling temperatures allowed for a flash freeze of area roads making for extremely hazardous travel.
Third, the combination of earlier thawing and sub-zero temperatures allowed for freeze-up jams to develop and exasperate on-going problems on the Missisquoi and Lamoille rivers.

Winter Storm in GRAND ISLE, VERMONT
From 12-JAN-18 22:00:00 to 13-JAN-18 12:00:00 (EST-5)
Property damage: 10.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet Friday night before changing to snow well after midnight. Sleet accumulated around 1/2 inch with snowfall of 4 to 8 inches. A flash freeze made traveling very hazardous.

Winter Storm in WESTERN FRANKLIN, VERMONT
From 12-JAN-18 22:00:00 to 13-JAN-18 12:00:00 (EST-5)
Property damage: 10.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet Friday night before changing to snow well after midnight. Sleet accumulated around 1/2 inch with snowfall of 4 to 8 inches. A flash freeze made traveling very hazardous.

Winter Storm in WESTERN CHITTENDEN, VERMONT
From 12-JAN-18 23:00:00 to 13-JAN-18 12:00:00 (EST-5)
Property damage: 10.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet Friday night before changing to snow well after midnight. Sleet accumulated around 1/2 inch with snowfall of 4 to 8 inches. A flash freeze made traveling very hazardous.

Winter Weather in EASTERN ADDISON, VERMONT
From 13-JAN-18 00:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet early Saturday morning before ending as snow midday Saturday. Sleet accumulated around 1/2 inch with snowfall of a few inches. A flash freeze made for some hazardous road conditions.

Winter Weather in WESTERN ADDISON, VERMONT
From 13-JAN-18 00:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet early Saturday morning before ending as snow midday Saturday. Sleet accumulated around 1/2 inch with snowfall of a few inches. A flash freeze made for some hazardous road conditions.

Winter Weather in EASTERN CHITTENDEN, VERMONT
From 12-JAN-18 23:00:00 to 13-JAN-18 12:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet Friday night and changed to snow in the pre-dawn hours of Saturday before ending at midday.. Sleet accumulated around 1/2 inch with snowfall of 3 to 5 inches. A flash freeze made for some hazardous road conditions.

Winter Weather in EASTERN FRANKLIN, VERMONT
From 12-JAN-18 23:00:00 to 13-JAN-18 12:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet Friday night and changed to snow in the pre-dawn hours of Saturday before ending at midday.. Sleet accumulated around 1/2 inch with snowfall of 3 to 5 inches. A flash freeze made for some hazardous road conditions.

Winter Weather in EASTERN RUTLAND, VERMONT
From 13-JAN-18 02:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet early Saturday morning before ending as snow by mid-morning. Freezing rain and sleet accumulated around 1/2 inch with snowfall of a few inches in spots. A flash freeze made for some hazardous road conditions.

Winter Weather in WESTERN RUTLAND, VERMONT
From 13-JAN-18 02:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet early Saturday morning before ending as snow by mid-morning. Freezing rain and sleet accumulated around 1/2 inch with snowfall of a few inches in spots. A flash freeze made for some hazardous road conditions.

Winter Weather in WINDSOR, VERMONT
From 13-JAN-18 04:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet early Saturday morning before ending as snow by mid-morning. Freezing rain and sleet accumulated around 1/2 inch with snowfall of a few inches in spots. A flash freeze made for some hazardous road conditions.

Winter Weather in ORANGE, VERMONT
From 13-JAN-18 03:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet early Saturday morning before ending as snow by mid-morning. Freezing rain and sleet accumulated around 1/2 inch with snowfall of a few inches in spots. A flash freeze made for some hazardous road conditions.

Winter Weather in ESSEX, VERMONT
From 13-JAN-18 01:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet early Saturday morning before ending as snow by mid-morning. Freezing rain and sleet accumulated around 1/2 inch with snowfall of a few inches in spots. A flash freeze made for some hazardous road conditions.

Winter Weather in CALEDONIA, VERMONT
From 13-JAN-18 01:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet early Saturday morning before ending as snow by mid-morning. Freezing rain and sleet accumulated around 1/2 inch with snowfall of a few inches in spots. A flash freeze made for some hazardous road conditions.

Winter Weather in ORLEANS, VERMONT
From 13-JAN-18 00:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet early Saturday morning before ending as snow by mid-morning. Freezing rain and sleet accumulated around 1/2 inch with snowfall of several inches. A flash freeze made for some hazardous road conditions.

Winter Weather in WASHINGTON, VERMONT
From 13-JAN-18 00:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet early Saturday morning before ending as snow by mid-morning. Freezing rain and sleet accumulated around 1/2 inch with snowfall of several inches. A flash freeze made for some hazardous road conditions.

Flood in FRANKLIN, VERMONT
From 13-JAN-18 06:00:00 to 14-JAN-18 23:00:00 (EST-5)
Location: SWANTON
Flood cause: Ice Jam
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A large ice jam formed on the Missisquoi River in the Village of Swanton, VT, extending from below the Route 78 bridge upstream for several miles. Numerous structures were impacted with dozens of homes evacuated. State Route 78 was closed for nearly 24 hours due to high water. Several of the impacted homes were heavily damaged.

Flood in LAMOILLE, VERMONT
From 13-JAN-18 06:30:00 to 13-JAN-18 10:00:00 (EST-5)
Location: JOHNSON
Flood cause: Ice Jam
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An ice jam formed on the Lamoille River in Johnson, VT around 630 am local time. Rapid water level rises occurred requiring evacuations of several apartment buildings and flooding the town's library, post office and a local market. The town sewage treatment plant was also affected.

Winter Weather in LAMOILLE, VERMONT
From 13-JAN-18 00:00:00 to 13-JAN-18 10:00:00 (EST-5)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain changed to a prolonged period of sleet early Saturday morning before ending as snow by mid-morning. Freezing rain and sleet accumulated around 1/2 inch with snowfall of several inches. A flash freeze made for some hazardous road conditions.