Our late-season winter storm is more or less on track this morning as low pressure moves up towards Cape Cod en route back northwest to Boston. Ahead of the storm, winds have shifted around from the southeast to the northeast, and cooler air is now advancing from Canada.
Light rain and snow this morning will become steadier and heavier as the day goes on. With stronger dynamics arriving aloft, cool air will arrive not just from the north, but also from above. This should be the extra boost needed to flip rain over to snow along (most of) the coastal plain. Winter and spring will be battling it out along the I-95 corridor for much of the day with snow falling to the west and rain to the east. Some locations may see rain and snow change over several times as bands of heavier precip arrive with more cold air, and lulls give the warmth an opening to return. With that in mind, the best odds for meaningful accumulation are still above 500ft in elevation and west of I-95. Some of the higher hills and mountains are likely headed for over a foot of snow by the time the storm departs tomorrow.
As with almost any snow in April, whatever accumulates today will be extremely heavy and wet. It’ll only take 3-5″ or so before trees and power lines start coming down. So if you’re in the foothills/mountains, especially in central/southern NH, be ready for power outages that might last a little while.
Rain and snow will ease up a bit this afternoon as drier air moves in aloft before picking up again this evening. Blocking high pressure in the Atlantic means that this system isn’t going anywhere in a hurry, so we’ll be stuck with its effects through the day today into tomorrow.
High temps will range from the low 40s right along the coast this morning to the mid 30s inland.