A weakening cold front passed through the Northwest late last week and caused around 1/2 foot of snowfall. This same system brought 4 to 8 inches of snowfall on Sunday to the central Great Lakes. A developing nor'easter caused 4 to 8 inches of snow in the Northeast yesterday. Warm, dry high pressure moved into the West beneath upper-level ridging.
The nor'easter is off the coast of eastern Massachusetts this morning. It will continue moving northeastward while it deepens, drawing in Atlantic moisture from the southeast and cold air from the continent. Due to its expected track off the coast, the heaviest snowfall - 1/2 to 1 foot today - will be along the coast from eastern Massachusetts through downeast Maine. The draw of cold air into the system across the Great Lakes will cause around 1/2 foot of snow east of the lakes today.
A weak cold front will pass mainly dryly through the West and Plains today through Wednesday, with additional benign, but cooler, weather for the West through midweek behind the front.
Cold air from northern North America will move into the coterminous U.S. on Thursday behind an Alberta clipper.
weather.gov
