A major winter storm is pummeling the Tri-State Area with snow and ice after New York and New Jersey declared states of emergency.

A weak clipper system is expected to move through New England early this week, bringing yet another round of snow to parts of the northern U.S. that have already had their fill so far this winter.

After periods of ice and rain overnight, a long-duration lake-effect snow system moved into the state Monday morning. In Western New York, wind gusts reached up to 70 mph, creating dangerous whiteout conditions. Lake-effect snow is expected to persist off Lakes Erie and Ontario for much of the week.

The New York City area accumulated just above 4 inches of snow as difficult travel conditions are expected through Saturday while crews work to clean up this wintry mess.

Officials in Vermont and Buffalo, N.Y., warned residents to stay off the roads as a winter weather system brought thick sheets of ice and snow. Tens of thousands of power customers faced outages.

A powerful winter storm system moving across the Great Lakes and Northeast is bringing snow and ice, frigid temperatures and possible whiteout conditions.

The winter weather this weekend caused travel problems during the busiest time of year. On Sunday, more than 10,000 flights were delayed nationwide, according to the flight tracking website FlightAware. On Monday, the disruption was less severe, with less than 500 flights delayed in the U.S., according to the site.