A potential nor’easter could bring the Northeast its first accumulating snow of the season before the week is over, with the strongest chance aimed at the mountains. The developing system is expected to take shape late this week and could deliver rain, snow and gusty winds from Thursday through Saturday.
That matters now because colder Canadian air is pushing south into the Northeast while warmer weather builds across the West, setting up a sharp temperature change across the East. The pattern also favors a big drop in temperatures after the storm passes, which could make this the first real taste of winter for parts of the region.
The best odds for accumulating snow are in the Northeast mountains, where colder air and elevation give the storm the easiest path to stick. Inland and higher-elevation areas could pick up moisture and accumulating snow if the system behaves as expected, while the immediate coast and the I-95 corridor would likely stay on the drier side in one scenario.
That forecast, however, is still moving. One model idea brings an initial area of low pressure inland across the Ohio Valley and eastern Great Lakes before transferring energy offshore, which would keep the coast relatively dry and leave the heavier snow inland. Another brings the nor’easter much closer to the Eastern Seaboard, a track that could produce more significant impacts, including periods of heavy rain and gusty winds, while still limiting the heaviest snow to higher elevations. A third path sends the storm farther offshore into the open Atlantic, which would cut back on coastal rain, wind and inland snow, but that outcome is not favored now.
The bigger weather setup is already in place. A strong ridge is building over the western United States, colder Canadian air is pressing south, and the larger pattern involves the polar jet stream and an unusually early disruption of the stratospheric polar vortex high above the Arctic. That combination is why the late-week forecast is so sensitive to small changes in the track. By the end of the week, the question is less whether the Northeast gets a storm than how close it comes and which part of the region ends up under the coldest air.
