A strong surface low off the Massachusetts coast yesterday continued to deepen as it moved northeastward. This system brought up to 1 1/2 feet of snow to coastal and near-coastal areas of Massachusetts to the southeastern two-thirds of Maine; amounts tapered to around 1/2 foot near the Canadian border. Another upper-level impulse brought around 1/2 foot of snow to the central Great Lakes region. Strong upper-level ridging was present across the West except for a low over northwestern Mexico.
Very warm snowpack conditions continued to exist yesterday along the western lower elevations of the Cascades, Sierra Nevada, and most of the northern California mountains. Slow snowmelt occurred there yesterday.
The surface low which caused the heavy snowfall in the Northeast is over the Canadian Maritime Provinces and will continue moving northeastward. Light snowfall will end today over Maine. A trailing surface low and surface trough will bring light snowfall to the lower Great Lakes today.
A strong cold front with little associated moisture will pass across the West today and bring light snowfall to the Rockies today and parts of the Midwest and Great Lakes tomorrow. The disturbance aloft associated with it will help to draw cold air from central Canada across the eastern two thirds of the U.S. Thursday through Friday. By late in the week, troughs moving down the descending limb of an eastern Pacific ridge will help to carve a broad trough which will cover most of the coterminous U.S. through the weekend.
weather.gov
