Early and late season snow...my least favorite to forecast. So many more variables to consider than in the dead of Winter. It makes for a challenging snowfall forecast, but I'll take a shot at it.
A clipper system is working in from the west. Out ahead of it, mild air will flow in off the ocean tomorrow, keeping it just warm enough for cold rain to fall most of the day.
Tomorrow evening, a secondary low will spin up over the ocean. As it strengthens, it will draw down colder air from Canada and will also manufacture it's own cold. Wet snow will mix in, and in many areas, will flip over completely tomorrow night.
While the atmosphere aloft will be plenty cold enough, the surface layer, know as the boundary layer, will have a tougher time getting cold. Therefore, it will be hard to accumulate especially along and near the coastline in the lowest elevations. Hills and higher elevations will do much better. So will the grass, tree limbs, decks, dirt roads etc. As the storm swirls by it will be intensifying. Snow will linger longer along the New Brunswick border in Eastern and Northern Maine. This will be the jackpot zone, and some towns may get over 6".
We've got well over a day to fine tune the snow amounts, so check back for updates.
Todd Gutner - https://twitter.com/ToddWCSH https://www.instagram.com/tgutner/