A warm front lifted north of the region early on the 11th allowing unseasonably warm air to overspread the region. A record high temperature of 55 degrees was set at Bangor on the 11th. Low pressure tracking north of Maine then began to pull the front back south late on the 11th through the morning of the 12th while low pressure tracked along the front. The colder air moving south allowed the rain to transition to heavy snow and sleet across the Saint John Valley and extreme northern Maine through the evening of the 11th. The rain eventually changed to mostly sleet in a zone from northern Piscataquis...to southeast Aroostook...to southern Piscataquis and northern Washington countries.
Snowfall rates of 1 to 2 inches per hour occurred across the Saint John Valley through the morning of the 12th...with heavy snow and sleet across the remainder of northern portions of Aroostook and Somerset counties. Warning criteria snow and sleet accumulations occurred through the morning of the 12th. Precipitation persisted through the afternoon of the 12th...diminishing late. Storm total snow accumulations across the Saint John Valley ranged from 10 to 14 inches. Across the remainder of northern Aroostook county storm total snow accumulations generally ranged from 7 to 11 inches along with 1 to 3 inches of sleet. Across the remainder of northern and east-central Maine...storm total snow accumulations generally ranged from 1 to 3 inches along with 1 to 3 inches of sleet. The late arrival of cold air limited wintry precipitation Downeast.

Sleet in NORTHERN PISCATAQUIS, MAINE
From 11-JAN-20 23:00:00 to 12-JAN-20 17:00:00 (EST-5)
Reported by: Trained Spotter

Storm total snow accumulations ranged from 1 to 2 inches...along with 1 to 3 inches of sleet.

Sleet in NORTHERN PENOBSCOT, MAINE
From 11-JAN-20 23:00:00 to 12-JAN-20 17:00:00 (EST-5)
Reported by: Trained Spotter

Storm total snow accumulations ranged from 1 to 3 inches...along with 1 to 3 inches of sleet.

Heavy Snow in NORTHWEST AROOSTOOK, MAINE
From 11-JAN-20 17:00:00 to 12-JAN-20 18:00:00 (EST-5)
Reported by: Trained Spotter

Storm total snow accumulations ranged from 10 to 14 inches.

Winter Storm in NORTHEAST AROOSTOOK, MAINE
From 11-JAN-20 20:00:00 to 12-JAN-20 18:00:00 (EST-5)
Reported by: Trained Spotter

Storm total snow accumulations ranged from 7 to 12 inches...along with 1 to 3 inches of sleet.

Sleet in SOUTHEAST AROOSTOOK, MAINE
From 11-JAN-20 23:00:00 to 12-JAN-20 17:00:00 (EST-5)
Reported by: Trained Spotter

Storm total snow accumulations ranged from 2 to 4 inches...along with 1 to 3 inches of sleet.

Sleet in CENTRAL PISCATAQUIS, MAINE
From 11-JAN-20 23:00:00 to 12-JAN-20 17:00:00 (EST-5)
Reported by: Trained Spotter

Storm total snow accumulations ranged from 1 to 2 inches...along with 1 to 3 inches of sleet.

Sleet in NORTHERN WASHINGTON, MAINE
From 12-JAN-20 01:00:00 to 12-JAN-20 17:00:00 (EST-5)
Reported by: Trained Spotter

Storm total snow accumulations ranged from 1 to 3 inches...along with 1 to 3 inches of sleet.

Winter Storm in NORTHERN SOMERSET, MAINE
From 11-JAN-20 20:00:00 to 12-JAN-20 18:00:00 (EST-5)
Reported by: Other Federal Agency

Storm total snow accumulations ranged from 7 to 10 inches...along with 1 to 2 inches of sleet.

Sleet in CENTRAL PENOBSCOT, MAINE
From 12-JAN-20 01:00:00 to 12-JAN-20 17:00:00 (EST-5)
Reported by: Trained Spotter

Storm total snow accumulations ranged from 1 to 3 inches...along with 1 to 3 inches of sleet.

Sleet in SOUTHERN PISCATAQUIS, MAINE
From 12-JAN-20 01:00:00 to 12-JAN-20 17:00:00 (EST-5)
Reported by: Trained Spotter

Storm total snow accumulations ranged from 1 to 3 inches...along with 1 to 3 inches of sleet.