The storm dumped one round of snow on parts of the region late Sunday and could drop 10 to 20 inches total by Tuesday morning from Pennsylvania to ME, forecasters said. Parts of New York, New Jersey and CT are under a winter storm watch starting Sunday morning.
So far, the service estimates eastern MA has seen between two and three inches of accumulation, while the central and western parts of the state have observed higher totals ranging from nine inches in Spencer to 10 in Williamstown.
The storm, which for days has been dumping heavy snow from parts of California to the northern Midwest and inundating other areas with heavy rain, has been responsible for several deaths, according to reports.
It has been blamed for several deaths.
Major highways have reopened in Wyoming and Colorado, a day after snow and high winds caused blizzard conditions and clogged roads with snow drifts.
As the storm shifts east, flight delays and cancellations are continuing to pile up - disrupting travellers heading home after Thanksgiving.
The bodies of a boy and a girl, both five years old, were found in central Arizona after their vehicle was swept away last Friday while crossing a swollen creek.
Two adults and four other children were rescued by helicopter, but a 6-year-old girl is still missing.
Even within Boston, which is under a winter weather advisory, snowfall totals could vary widely, with as few as 3 inches at Logan Airport and as much as a foot in Jamaica Plain, Buttrick said in a brief phone interview Sunday morning.
Wind and rain are causing some arriving flights at San Francisco to be delayed an average of 4 1/2 hours.
But as the second system moves out Monday, cold air is expected to move in from the north, bringing another round of snow in Boston during the afternoon and evening, according to the weather service.
There were also dozens of flight delays in Chicago and Minneapolis.
At Denver International Airport, 100 flights were canceled Saturday because of high winds.
Hundreds of flights are being canceled because of a winter storm sweeping across the USA and heading right for the tri-state area and New England, leaving travelers scrambling to get home after Thanksgiving.
Farther south, precipitation was in the form of rain and thunderstorms.