It won’t be a blockbuster blizzard, but the first real winter storm of the season is arriving today as low pressure tracks along I-90 from Buffalo to Boston. Precipitation will arrive in southwestern NH early this afternoon before spreading northeast into Maine closer to sunset. While temps will start out around or above freezing in most places, evaporational cooling should start just about everyone off with snow as a precip type except perhaps for the NH Seacoast.
Here’s a forecast map valid at 5 PM showing snow falling across much of the area with just southern NH experiencing some rain as winds are a bit more onshore.
The steadiest and heaviest snow will fall early in the overnight period as the storm passes just to our south before beginning to taper off tomorrow morning.
This forecast map valid at 11 PM shows moderate to heavy snow falling across much of the area while a coastal front sets up south of Portland, introducing some sleet, ice, and rain.
As the sun comes up tomorrow, light snow will linger across most of the area and mixed precipitation over SE NH/coastal York County will change back over to snow. Not much additional accumulation is expected, but roads may remain slick until midday.
So how much snow are we talking?
Here’s a quick look at what I’d expect from this event in our area. The jackpot will, as usual, be the mountains of western ME and NH where colder air and better lift will set up more favorable snow to liquid ratios. Most of the ski areas should get a solid 8-12″ though if it were me I’d pick Sunday River over Sugarloaf for this storm.
For the rest of us, it’s looking like a general 4-8″ with lower totals in southern NH where sleet/ice will mix in and especially along the immediate coast where rain will enter the picture.
All in all this won’t be a big storm by our standards, but it will provide some much-welcomed snowcover as we get closer to Christmas.