A strong and deepening surface low over southeastern Canada yesterday morning continued moving northeastward yesterday. Six to 10 inches of snowfall occurred in northern Maine, with similar amounts occurring in western New York due to lake effects. In the Northwest, warm onshore flow ahead of a surface low caused up to 1/2 foot of snowfall in the Cascades, Trinity Mountains, and northern Sierra Nevada yesterday.
The coterminous U.S. snowpack remains cool over most of its extent except for warm temperatures across the West Coast states due to the strong onshore flow yesterday. Warm conditions also are present at lower elevations in the Southwest. Slow snowmelt occurred yesterday at lower elevations in these areas as well as the Southern Plains.
A weak surface low over the Upper Midwest will move eastward through the Great Lakes today and the East tomorrow, bringing light snowfall in the Northeast.
Active weather will be present in the West through Thursday. More than a foot of snowfall is expected at the higher elevations of the Northwest through the Northern Rockies, northern Great Basin, and Sierra Nevada today through Thursday.
weather.gov
