The North Atlantic weather pattern has entered a “blocking” phase this morning which means that instead of cruising from west to east, storms across the basin are now retrograding from east to west. That means that we’ll have to think about the big ocean storm spinning south of Nova Scotia which is headed our way rather than trundling out to sea like it normally would.
Here’s a satellite view of the storm in question. Note the westward movement of clouds across the Gulf of Maine.
Before those clouds arrive this afternoon, skies will be clear across the region and temps will warm into the mid 40s north to near 60 south. north/northwest winds on the western flank of this ocean storm will push the warm air all the way to the coastline. As the afternoon goes on, clouds will increase from east to west (weird, isn’t it).
This storm will throw a band of precipitation our way later in the evening. It will enter the Penobscot Bay region around sunset and move steadily west until it fizzles out over central/western NH tomorrow afternoon. The mountains/foothills will see this precipitation fall entirely as snow with 1-3″ of accumulation expected in the favored upslope-enhanced spots. The immediate coast will see mostly rain while spots in between see a rain/snow mix with minimal if any accumulation.