From the WABI-TV5 & CW Forecast Center:

The ridge of high pressure that brought the sunny and mild weather to Maine Thursday and Friday will continue to move east away from New England tonight. Clouds will be on the increase across our region later tonight as an arctic cold front approaches from the west. Temps later tonight will fall into the teens to low 20s across most of the Pine Tree State.
As the arctic front slowly pushes off to the east of New England early Saturday morning a storm will develop along the front just to the east of the Mid-Atlantic Coastline. The storm will then intensify as it heads northeast Saturday afternoon and evening. By later Saturday night the storm will be located just to the east of Nova Scotia and by Sunday it will move up into Newfoundland.
The storm's exact track up the coastline will determine how much snow we see across Maine tomorrow and tomorrow night. It currently appears that west of the Bangor region we only receive light snow, while as you head east across the state the snow will grow steadier and heavier with far eastern region seeing the bulk of the snowfall from this fast moving Nor’easter. Snowfall will likely range from 2” or less north and west of a line from Skowhegan to Milo to Houlton. From Lincoln to Bangor to Belfast an average of 2 to 5” will likely accumulate, with 4 to 8” possible between Bar Harbor and Calais on east to Eastport. A shift to the east in the storm track will mean less snow across the state, but any shift to the west in the storms track will bring steadier and heavier snow to our region.
Behind the departing storm arctic air slide into New England from Canada and bring very chilly temps to Maine both Sunday and Monday along with a gusty northwest breeze. A disturbance aloft rotating southeast out of Southern Canada may kick off a round of flurries, snow showers and heavier snow squalls across the western mountains of Maine Sunday, with high pressure producing ample sunshine throughout Maine on Monday. A warm front will bring more clouds, a few flurries and snow showers, along with milder temps to our region on Tuesday.

Tonight: Becoming cloudy, flurries possible late and low temps in the teens west and 20s east.

Saturday: Periods of snow and snow showers likely, becoming blustery and colder, with high temps mostly in the mid 20s to mid 30s.

Saturday night: Evening snow, steadiest east tapering off, becoming windy and colder, with low temps in the single numbers to very low teens.

Sunday: Variably cloudy, possible flurries and snow showers, blustery and cold, with high temps in the single numbers north and teens south.

Monday: More sun than clouds, breezy and cold, with high temps in the teens to near 20.

Tuesday: Variably cloudy, flurries and snow showers possible, with high temps in the upper 20s to mid 30s.

Chris Ewing
WABI-TV5 & CW Meteorologist